TY  - JOUR
AU  - Lović, Jelena
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Tripković, Amalija
AU  - Stevanović, Rade M.
AU  - Jovanović, Vladislava M.
AU  - Popović, Ksenija
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1620
AB  - Formic acid oxidation was examined on platinum-bismuth deposits on glassy carbon substrate prepared by two-step process, i.e., electrochemical deposition of Bi followed by electrochemical deposition of Pt as described in our previous article (J Electrochem Soc 161:H547-H554, 2014). Upon treatment of as-prepared clusters by slow anodic sweep, bimetallic structure consisting of Bi core occluded by Pt and Bi-oxide was obtained and exhibited significant activity and exceptional stability in HCOOH oxidation. In order to explain such electrocatalytic stability, in this work, the electrochemical properties of Pt"Bi/GC catalyst were investigated applying same protocols in supporting electrolyte with or without HCOOH and compared with Pt/GC. The protocols comprised potentiodynamic, quasi-steady-state, and chronoamperometric measurements combined with the surface characterization by COads stripping voltammetry. Application of potential cycling at Pt"Bi/GC electrode in supporting electrolyte containing HCOOH leads to minor change in surface morphology, mildly leaching of Bi from the electrode surface, and negligible decrease in activity. On the other hand, significant Bi dissolution and considerable decrease in activity are the effects of the same treatment without HCOOH. Contrary to Pt"Bi/GC, Pt/GC electrodes subjected to the same protocols exhibit completely opposite properties being more stabile during potential cycling without HCOOH than in the presence of this acid. Exceptional stability in formic acid oxidation of Pt"Bi/GC catalyst is thus most probably the result of the combination of predominant dehydrogenation path of the reaction, suppressed Bi leaching, and compensation of dissolved Bi from the core as its source due to which surface morphology endured minor changes.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation
VL  - 19
IS  - 8
SP  - 2223
EP  - 2233
DO  - 10.1007/s10008-015-2841-8
ER  - 

@article{
author = "Lović, Jelena and Stevanović, Sanja and Tripković, Dušan and Tripković, Amalija and Stevanović, Rade M. and Jovanović, Vladislava M. and Popović, Ksenija",
year = "2015",
abstract = "Formic acid oxidation was examined on platinum-bismuth deposits on glassy carbon substrate prepared by two-step process, i.e., electrochemical deposition of Bi followed by electrochemical deposition of Pt as described in our previous article (J Electrochem Soc 161:H547-H554, 2014). Upon treatment of as-prepared clusters by slow anodic sweep, bimetallic structure consisting of Bi core occluded by Pt and Bi-oxide was obtained and exhibited significant activity and exceptional stability in HCOOH oxidation. In order to explain such electrocatalytic stability, in this work, the electrochemical properties of Pt"Bi/GC catalyst were investigated applying same protocols in supporting electrolyte with or without HCOOH and compared with Pt/GC. The protocols comprised potentiodynamic, quasi-steady-state, and chronoamperometric measurements combined with the surface characterization by COads stripping voltammetry. Application of potential cycling at Pt"Bi/GC electrode in supporting electrolyte containing HCOOH leads to minor change in surface morphology, mildly leaching of Bi from the electrode surface, and negligible decrease in activity. On the other hand, significant Bi dissolution and considerable decrease in activity are the effects of the same treatment without HCOOH. Contrary to Pt"Bi/GC, Pt/GC electrodes subjected to the same protocols exhibit completely opposite properties being more stabile during potential cycling without HCOOH than in the presence of this acid. Exceptional stability in formic acid oxidation of Pt"Bi/GC catalyst is thus most probably the result of the combination of predominant dehydrogenation path of the reaction, suppressed Bi leaching, and compensation of dissolved Bi from the core as its source due to which surface morphology endured minor changes.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation",
volume = "19",
number = "8",
pages = "2223-2233",
doi = "10.1007/s10008-015-2841-8"
}

Lović, J., Stevanović, S., Tripković, D., Tripković, A., Stevanović, R. M., Jovanović, V. M.,& Popović, K.. (2015). Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation. in Journal of Solid State Electrochemistry
Springer, New York., 19(8), 2223-2233.
https://doi.org/10.1007/s10008-015-2841-8

Lović J, Stevanović S, Tripković D, Tripković A, Stevanović RM, Jovanović VM, Popović K. Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation. in Journal of Solid State Electrochemistry. 2015;19(8):2223-2233.
doi:10.1007/s10008-015-2841-8 .

Lović, Jelena, Stevanović, Sanja, Tripković, Dušan, Tripković, Amalija, Stevanović, Rade M., Jovanović, Vladislava M., Popović, Ksenija, "Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation" in Journal of Solid State Electrochemistry, 19, no. 8 (2015):2223-2233,
https://doi.org/10.1007/s10008-015-2841-8 . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Jovanović, Vladislava M.
AU  - Stevanović, Rade M.
AU  - Tripković, Amalija
AU  - Popović, Ksenija
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1473
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3161
AB  - Formic acid oxidation was studied on platinum-coated bismuth deposits on glassy carbon substrate. The catalyst was prepared by a two-step process using chronocoulometry, i.e. controlled amount of Bi was electrodeposited onto glassy carbon followed by electrodeposition of Pt layer. The amount of Pt was constant while the amount of Bi vary to correspond the molar ratio of Pt:Bi = 1:0.1 or 1:1 or 1:10. AFM characterization of the electrode surface indicates that Pt is deposited preferentially on previously formed Bi particles, but cyclic voltammetry revealed Bi leaching meaning that Bi was not completely occluded by Pt. In order to obtain stable electrode surface, deposits were subjected to potential cycling up to 1.2 V vs. SCE in supporting electrolyte, prior to use as catalysts for formic acid oxidation. On this way the electrodes composed of Bi core occluded by Pt and Bi-oxide surface layers were obtained. The Pt(Bi)/GC electrodes exhibit enhanced electrocatalytic activity in comparison to Pt/GC for formic acid oxidation which depends on composition and surface morphology. High currents and onset potential shifted to negative values indicate a significant increase in direct path what is explained through ensemble effect induced by Bi-oxide species interrupting Pt domains. Electronic modification of Pt both by surface and sub-surface Bi can play some role as well. Significantly prolonged potential cycling in supporting electrolyte of previously stabilized Pt(Bi)/GC electrodes by Bi oxide, led to considerably lower Bi leaching accompanied by dissolution and redeposition of Pt and the outcome of this treatment was Pt shell over Bi core. These Pt"Bi/GC catalysts also exhibit higher activity for HCOOH oxidation in comparison to Pt/GC depending on the quantity of Bi remained under Pt shell, but in this case the improvement is induced solely by electronic effect of under-laying Bi.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation
VL  - 735
SP  - 1
EP  - 9
DO  - 10.1016/j.jelechem.2014.09.036
ER  - 

@article{
author = "Lović, Jelena and Stevanović, Sanja and Tripković, Dušan and Jovanović, Vladislava M. and Stevanović, Rade M. and Tripković, Amalija and Popović, Ksenija",
year = "2014",
abstract = "Formic acid oxidation was studied on platinum-coated bismuth deposits on glassy carbon substrate. The catalyst was prepared by a two-step process using chronocoulometry, i.e. controlled amount of Bi was electrodeposited onto glassy carbon followed by electrodeposition of Pt layer. The amount of Pt was constant while the amount of Bi vary to correspond the molar ratio of Pt:Bi = 1:0.1 or 1:1 or 1:10. AFM characterization of the electrode surface indicates that Pt is deposited preferentially on previously formed Bi particles, but cyclic voltammetry revealed Bi leaching meaning that Bi was not completely occluded by Pt. In order to obtain stable electrode surface, deposits were subjected to potential cycling up to 1.2 V vs. SCE in supporting electrolyte, prior to use as catalysts for formic acid oxidation. On this way the electrodes composed of Bi core occluded by Pt and Bi-oxide surface layers were obtained. The Pt(Bi)/GC electrodes exhibit enhanced electrocatalytic activity in comparison to Pt/GC for formic acid oxidation which depends on composition and surface morphology. High currents and onset potential shifted to negative values indicate a significant increase in direct path what is explained through ensemble effect induced by Bi-oxide species interrupting Pt domains. Electronic modification of Pt both by surface and sub-surface Bi can play some role as well. Significantly prolonged potential cycling in supporting electrolyte of previously stabilized Pt(Bi)/GC electrodes by Bi oxide, led to considerably lower Bi leaching accompanied by dissolution and redeposition of Pt and the outcome of this treatment was Pt shell over Bi core. These Pt"Bi/GC catalysts also exhibit higher activity for HCOOH oxidation in comparison to Pt/GC depending on the quantity of Bi remained under Pt shell, but in this case the improvement is induced solely by electronic effect of under-laying Bi.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation",
volume = "735",
pages = "1-9",
doi = "10.1016/j.jelechem.2014.09.036"
}

Lović, J., Stevanović, S., Tripković, D., Jovanović, V. M., Stevanović, R. M., Tripković, A.,& Popović, K.. (2014). Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation. in Journal of Electroanalytical Chemistry
Elsevier., 735, 1-9.
https://doi.org/10.1016/j.jelechem.2014.09.036

Lović J, Stevanović S, Tripković D, Jovanović VM, Stevanović RM, Tripković A, Popović K. Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation. in Journal of Electroanalytical Chemistry. 2014;735:1-9.
doi:10.1016/j.jelechem.2014.09.036 .

Lović, Jelena, Stevanović, Sanja, Tripković, Dušan, Jovanović, Vladislava M., Stevanović, Rade M., Tripković, Amalija, Popović, Ksenija, "Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation" in Journal of Electroanalytical Chemistry, 735 (2014):1-9,
https://doi.org/10.1016/j.jelechem.2014.09.036 . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Jovanović, Vladislava M.
AU  - Stevanović, Rade M.
AU  - Tripković, Amalija
AU  - Popović, Ksenija
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1473
AB  - Formic acid oxidation was studied on platinum-coated bismuth deposits on glassy carbon substrate. The catalyst was prepared by a two-step process using chronocoulometry, i.e. controlled amount of Bi was electrodeposited onto glassy carbon followed by electrodeposition of Pt layer. The amount of Pt was constant while the amount of Bi vary to correspond the molar ratio of Pt:Bi = 1:0.1 or 1:1 or 1:10. AFM characterization of the electrode surface indicates that Pt is deposited preferentially on previously formed Bi particles, but cyclic voltammetry revealed Bi leaching meaning that Bi was not completely occluded by Pt. In order to obtain stable electrode surface, deposits were subjected to potential cycling up to 1.2 V vs. SCE in supporting electrolyte, prior to use as catalysts for formic acid oxidation. On this way the electrodes composed of Bi core occluded by Pt and Bi-oxide surface layers were obtained. The Pt(Bi)/GC electrodes exhibit enhanced electrocatalytic activity in comparison to Pt/GC for formic acid oxidation which depends on composition and surface morphology. High currents and onset potential shifted to negative values indicate a significant increase in direct path what is explained through ensemble effect induced by Bi-oxide species interrupting Pt domains. Electronic modification of Pt both by surface and sub-surface Bi can play some role as well. Significantly prolonged potential cycling in supporting electrolyte of previously stabilized Pt(Bi)/GC electrodes by Bi oxide, led to considerably lower Bi leaching accompanied by dissolution and redeposition of Pt and the outcome of this treatment was Pt shell over Bi core. These Pt"Bi/GC catalysts also exhibit higher activity for HCOOH oxidation in comparison to Pt/GC depending on the quantity of Bi remained under Pt shell, but in this case the improvement is induced solely by electronic effect of under-laying Bi.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation
VL  - 735
SP  - 1
EP  - 9
DO  - 10.1016/j.jelechem.2014.09.036
ER  - 

@article{
author = "Lović, Jelena and Stevanović, Sanja and Tripković, Dušan and Jovanović, Vladislava M. and Stevanović, Rade M. and Tripković, Amalija and Popović, Ksenija",
year = "2014",
abstract = "Formic acid oxidation was studied on platinum-coated bismuth deposits on glassy carbon substrate. The catalyst was prepared by a two-step process using chronocoulometry, i.e. controlled amount of Bi was electrodeposited onto glassy carbon followed by electrodeposition of Pt layer. The amount of Pt was constant while the amount of Bi vary to correspond the molar ratio of Pt:Bi = 1:0.1 or 1:1 or 1:10. AFM characterization of the electrode surface indicates that Pt is deposited preferentially on previously formed Bi particles, but cyclic voltammetry revealed Bi leaching meaning that Bi was not completely occluded by Pt. In order to obtain stable electrode surface, deposits were subjected to potential cycling up to 1.2 V vs. SCE in supporting electrolyte, prior to use as catalysts for formic acid oxidation. On this way the electrodes composed of Bi core occluded by Pt and Bi-oxide surface layers were obtained. The Pt(Bi)/GC electrodes exhibit enhanced electrocatalytic activity in comparison to Pt/GC for formic acid oxidation which depends on composition and surface morphology. High currents and onset potential shifted to negative values indicate a significant increase in direct path what is explained through ensemble effect induced by Bi-oxide species interrupting Pt domains. Electronic modification of Pt both by surface and sub-surface Bi can play some role as well. Significantly prolonged potential cycling in supporting electrolyte of previously stabilized Pt(Bi)/GC electrodes by Bi oxide, led to considerably lower Bi leaching accompanied by dissolution and redeposition of Pt and the outcome of this treatment was Pt shell over Bi core. These Pt"Bi/GC catalysts also exhibit higher activity for HCOOH oxidation in comparison to Pt/GC depending on the quantity of Bi remained under Pt shell, but in this case the improvement is induced solely by electronic effect of under-laying Bi.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation",
volume = "735",
pages = "1-9",
doi = "10.1016/j.jelechem.2014.09.036"
}

Lović, J., Stevanović, S., Tripković, D., Jovanović, V. M., Stevanović, R. M., Tripković, A.,& Popović, K.. (2014). Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation. in Journal of Electroanalytical Chemistry
Elsevier., 735, 1-9.
https://doi.org/10.1016/j.jelechem.2014.09.036

Lović J, Stevanović S, Tripković D, Jovanović VM, Stevanović RM, Tripković A, Popović K. Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation. in Journal of Electroanalytical Chemistry. 2014;735:1-9.
doi:10.1016/j.jelechem.2014.09.036 .

Lović, Jelena, Stevanović, Sanja, Tripković, Dušan, Jovanović, Vladislava M., Stevanović, Rade M., Tripković, Amalija, Popović, Ksenija, "Catalytic activities of Pt thin films electrodeposited onto Bi coated glassy carbon substrate toward formic acid electrooxidation" in Journal of Electroanalytical Chemistry, 735 (2014):1-9,
https://doi.org/10.1016/j.jelechem.2014.09.036 . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Tripković, Vladimir
AU  - Minić, Dragica M.
AU  - Gavrilović, Aleksandra
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1526
AB  - The role of Sn on the catalytic activity for CO and formic acid oxidation is studied by comparing the activities of differently treated PtSn/C and Pt/C catalysts. The catalysts are prepared by a microwave-assisted polyol synthesis method. As revealed by scanning tunneling and transmission electron microscopic (STM and TEM) characterization, the outcomes of the synthesis procedure for both Pt and PtSn are small particles, similar to 1.5 nm in diameter. Upon deposition on the carbon support, the particle size increases to similar to 2.5 nm due to sintering. X-ray diffraction (XRD) analysis shows that PtSn/C has a low alloying degree and is mainly composed of Pt and Pt3Sn phases. The remaining Sn is present in the form of very small tin oxide particles. Different surfaces are obtained by double-layer, oxide, and CO annealing of the Pt/C and PtSn/C catalysts and by modifying the CO-annealed surfaces with irreversibly adsorbed tin, Sn-irr. The presence of Sn in any form (oxide, alloyed, or Sn-irr) on the surface shifts the onset potential for the CO oxidation negatively by more than 0.4 V in comparison to equivalently treated Pt/C catalysts. For the CO-annealed PtSn/C catalyst, a so-called skeleton structure, Sn is present only in the subsurface layers. The subsurface Sn has a mild effect on the CO activity, and hence the onset potential is only marginally shifted to cathodic potentials by similar to 50 mV compared to that on Pt/C. The formic acid oxidation is enhanced at any of the PtSn/C surfaces with Sn in the surface layer. The activity enhancement is explained by a reduced CO poisoning of the surface Pt sites. As a consequence, the current is not entering plateau as on the Pt/C catalysts. Furthermore, the skeleton PtSn/C similar to 2 is times more active than similarly treated Pt/C. The results have been substantiated and explained by comprehensive density functional theory (DFT) simulations. The DFT results indicate that the increased oxidation rates are not only due to surface Sn but also due to a weakened CO binding in the vicinity of the surface SnOHx moieties and SnO2 particles.
PB  - American Chemical Society (ACS)
T2  - Journal of Physical Chemistry C
T1  - Insight into the Effect of Sn on CO and Formic Acid Oxidation at PtSn Catalysts
VL  - 118
IS  - 1
SP  - 278
EP  - 289
DO  - 10.1021/jp408207u
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Tripković, Vladimir and Minić, Dragica M. and Gavrilović, Aleksandra and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2014",
abstract = "The role of Sn on the catalytic activity for CO and formic acid oxidation is studied by comparing the activities of differently treated PtSn/C and Pt/C catalysts. The catalysts are prepared by a microwave-assisted polyol synthesis method. As revealed by scanning tunneling and transmission electron microscopic (STM and TEM) characterization, the outcomes of the synthesis procedure for both Pt and PtSn are small particles, similar to 1.5 nm in diameter. Upon deposition on the carbon support, the particle size increases to similar to 2.5 nm due to sintering. X-ray diffraction (XRD) analysis shows that PtSn/C has a low alloying degree and is mainly composed of Pt and Pt3Sn phases. The remaining Sn is present in the form of very small tin oxide particles. Different surfaces are obtained by double-layer, oxide, and CO annealing of the Pt/C and PtSn/C catalysts and by modifying the CO-annealed surfaces with irreversibly adsorbed tin, Sn-irr. The presence of Sn in any form (oxide, alloyed, or Sn-irr) on the surface shifts the onset potential for the CO oxidation negatively by more than 0.4 V in comparison to equivalently treated Pt/C catalysts. For the CO-annealed PtSn/C catalyst, a so-called skeleton structure, Sn is present only in the subsurface layers. The subsurface Sn has a mild effect on the CO activity, and hence the onset potential is only marginally shifted to cathodic potentials by similar to 50 mV compared to that on Pt/C. The formic acid oxidation is enhanced at any of the PtSn/C surfaces with Sn in the surface layer. The activity enhancement is explained by a reduced CO poisoning of the surface Pt sites. As a consequence, the current is not entering plateau as on the Pt/C catalysts. Furthermore, the skeleton PtSn/C similar to 2 is times more active than similarly treated Pt/C. The results have been substantiated and explained by comprehensive density functional theory (DFT) simulations. The DFT results indicate that the increased oxidation rates are not only due to surface Sn but also due to a weakened CO binding in the vicinity of the surface SnOHx moieties and SnO2 particles.",
publisher = "American Chemical Society (ACS)",
journal = "Journal of Physical Chemistry C",
title = "Insight into the Effect of Sn on CO and Formic Acid Oxidation at PtSn Catalysts",
volume = "118",
number = "1",
pages = "278-289",
doi = "10.1021/jp408207u"
}

Stevanović, S., Tripković, D., Tripković, V., Minić, D. M., Gavrilović, A., Tripković, A.,& Jovanović, V. M.. (2014). Insight into the Effect of Sn on CO and Formic Acid Oxidation at PtSn Catalysts. in Journal of Physical Chemistry C
American Chemical Society (ACS)., 118(1), 278-289.
https://doi.org/10.1021/jp408207u

Stevanović S, Tripković D, Tripković V, Minić DM, Gavrilović A, Tripković A, Jovanović VM. Insight into the Effect of Sn on CO and Formic Acid Oxidation at PtSn Catalysts. in Journal of Physical Chemistry C. 2014;118(1):278-289.
doi:10.1021/jp408207u .

Stevanović, Sanja, Tripković, Dušan, Tripković, Vladimir, Minić, Dragica M., Gavrilović, Aleksandra, Tripković, Amalija, Jovanović, Vladislava M., "Insight into the Effect of Sn on CO and Formic Acid Oxidation at PtSn Catalysts" in Journal of Physical Chemistry C, 118, no. 1 (2014):278-289,
https://doi.org/10.1021/jp408207u . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Tripković, Dušan
AU  - Popović, Ksenija
AU  - Jovanović, Vladislava M.
AU  - Tripković, Amalija
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1251
AB  - Formic acid oxidation was studied on two Pt-Bi catalysts, i.e., Pt2Bi and polycrystalline Pt modified by irreversible adsorbed Bi (Pt/Biirr) in order to establish the difference between the effects of Biirr and Bi in the alloyed state. The results were compared to pure Pt. It was found that both bimetallic catalysts were more active than Pt with the onset potentials shifted to more negative values and the currents at 0.0 V vs. saturated calomel electrode (under steady state conditions) improved by up to two order of magnitude. The origin of the high activity and stability of Pt2Bi was increased selectivity toward formic acid dehydrogenation caused by the ensemble and electronic effects and suppression of Bi leaching from the surface during formic acid oxidation. However, although Pt/Biirr also showed remarkable initial activity compared to pure Pt, dissolution of Bi was not suppressed and poisoning of the electrode surface induced by the dehydration path was observed. Comparison of the initial quasi-steady state and potentiodynamic results obtained for these two Pt-Bi catalysts revealed that the electronic effect, existing only in the alloy, contributed to the earlier start of the reaction, while the maximum current density was determined by the ensemble effect.
AB  - Oksidacija mravlje kiseline ispitivana je na dva tipa Pt-Bi katalizatora: Pt2Bi elektrodi i na polikristalnoj Pt elektrodi modifikovanoj ireverzibilno adsorbovanim Bi (Pt/Biirr). Aktivnosti su upoređene sa rezultatima dobijenim na čistoj poli- kristalnoj Pt elektrodi. Cilj je bio da se objasni razlika u delovanju ireverzibilno adsorbovanog Bi (Biirr) i Bi u legiranom stanju. Pokazano je da su oba bimetalna katalizatora aktivnija od polikristalne Pt, početak reakcije je pomeren ka negativnijim vrednostima i u poređenju sa čistom Pt pri stacionarnim uslovima dobijene su do dva reda veličine veće gustine struje. Razlog za veliku aktivnost i stabilnost Pt2Bi elektrode u oksidaciji mravlje kiseline je odigravanje reakcije po glavnom reakcionom putu (dehidroganacija mravlje kiseline), što je izazvano efektom trećeg tela i elektronskim efektom, kao i sprečavanje izluživanja Bi iz elektrode. S druge strane, iako Pt/Biirr pokazuje značajnu početnu aktivnost u odnosu na Pt, ova elektroda nije stabilna tokom reakcije oksidacije HCOOH zbog kontinualnog rastvaranja Bi sa površine elektrode, kao i trovanja površine izazvanog tokom reakcije po indirektnom, dehidratacionom putu. Poređenjem rezultata dobijenih na ove dve Pt-Bi elektrode može se objasniti uloga efekta trećeg tela i elektronskog efekta u oksidaciji HCOOH. Naime, elektronski efekat, koji postoji samo kod legure, doprinosi ranijem početku reakcije, dok je maksimalna struja određena efektom trećeg tela. Tokom cikliziranja Pt/Biirr elektrode Bi odlazi sa površine i efekat trećeg tela se gubi tokom vremena. Hronoamperometrijska merenja ukazuju na prednost legure, odnosno neophodnost legiranja Bi sa Pt da bi se dobio koroziono stabilan katalizator.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrocatalytic properties of Pt-Bi electrodes towards the electro-oxidation of formic acid
T1  - Elektrokatalitička svojstva Pt-Bi elektroda u oksidaciji mravlje kiseline
VL  - 78
IS  - 8
SP  - 1189
EP  - 1202
DO  - 10.2298/JSC121012138L
ER  - 

@article{
author = "Lović, Jelena and Tripković, Dušan and Popović, Ksenija and Jovanović, Vladislava M. and Tripković, Amalija",
year = "2013",
abstract = "Formic acid oxidation was studied on two Pt-Bi catalysts, i.e., Pt2Bi and polycrystalline Pt modified by irreversible adsorbed Bi (Pt/Biirr) in order to establish the difference between the effects of Biirr and Bi in the alloyed state. The results were compared to pure Pt. It was found that both bimetallic catalysts were more active than Pt with the onset potentials shifted to more negative values and the currents at 0.0 V vs. saturated calomel electrode (under steady state conditions) improved by up to two order of magnitude. The origin of the high activity and stability of Pt2Bi was increased selectivity toward formic acid dehydrogenation caused by the ensemble and electronic effects and suppression of Bi leaching from the surface during formic acid oxidation. However, although Pt/Biirr also showed remarkable initial activity compared to pure Pt, dissolution of Bi was not suppressed and poisoning of the electrode surface induced by the dehydration path was observed. Comparison of the initial quasi-steady state and potentiodynamic results obtained for these two Pt-Bi catalysts revealed that the electronic effect, existing only in the alloy, contributed to the earlier start of the reaction, while the maximum current density was determined by the ensemble effect., Oksidacija mravlje kiseline ispitivana je na dva tipa Pt-Bi katalizatora: Pt2Bi elektrodi i na polikristalnoj Pt elektrodi modifikovanoj ireverzibilno adsorbovanim Bi (Pt/Biirr). Aktivnosti su upoređene sa rezultatima dobijenim na čistoj poli- kristalnoj Pt elektrodi. Cilj je bio da se objasni razlika u delovanju ireverzibilno adsorbovanog Bi (Biirr) i Bi u legiranom stanju. Pokazano je da su oba bimetalna katalizatora aktivnija od polikristalne Pt, početak reakcije je pomeren ka negativnijim vrednostima i u poređenju sa čistom Pt pri stacionarnim uslovima dobijene su do dva reda veličine veće gustine struje. Razlog za veliku aktivnost i stabilnost Pt2Bi elektrode u oksidaciji mravlje kiseline je odigravanje reakcije po glavnom reakcionom putu (dehidroganacija mravlje kiseline), što je izazvano efektom trećeg tela i elektronskim efektom, kao i sprečavanje izluživanja Bi iz elektrode. S druge strane, iako Pt/Biirr pokazuje značajnu početnu aktivnost u odnosu na Pt, ova elektroda nije stabilna tokom reakcije oksidacije HCOOH zbog kontinualnog rastvaranja Bi sa površine elektrode, kao i trovanja površine izazvanog tokom reakcije po indirektnom, dehidratacionom putu. Poređenjem rezultata dobijenih na ove dve Pt-Bi elektrode može se objasniti uloga efekta trećeg tela i elektronskog efekta u oksidaciji HCOOH. Naime, elektronski efekat, koji postoji samo kod legure, doprinosi ranijem početku reakcije, dok je maksimalna struja određena efektom trećeg tela. Tokom cikliziranja Pt/Biirr elektrode Bi odlazi sa površine i efekat trećeg tela se gubi tokom vremena. Hronoamperometrijska merenja ukazuju na prednost legure, odnosno neophodnost legiranja Bi sa Pt da bi se dobio koroziono stabilan katalizator.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrocatalytic properties of Pt-Bi electrodes towards the electro-oxidation of formic acid, Elektrokatalitička svojstva Pt-Bi elektroda u oksidaciji mravlje kiseline",
volume = "78",
number = "8",
pages = "1189-1202",
doi = "10.2298/JSC121012138L"
}

Lović, J., Tripković, D., Popović, K., Jovanović, V. M.,& Tripković, A.. (2013). Electrocatalytic properties of Pt-Bi electrodes towards the electro-oxidation of formic acid. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 78(8), 1189-1202.
https://doi.org/10.2298/JSC121012138L

Lović J, Tripković D, Popović K, Jovanović VM, Tripković A. Electrocatalytic properties of Pt-Bi electrodes towards the electro-oxidation of formic acid. in Journal of the Serbian Chemical Society. 2013;78(8):1189-1202.
doi:10.2298/JSC121012138L .

Lović, Jelena, Tripković, Dušan, Popović, Ksenija, Jovanović, Vladislava M., Tripković, Amalija, "Electrocatalytic properties of Pt-Bi electrodes towards the electro-oxidation of formic acid" in Journal of the Serbian Chemical Society, 78, no. 8 (2013):1189-1202,
https://doi.org/10.2298/JSC121012138L . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1036
AB  - Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on high area carbon were investigated as the electrocatalysts for the COads and HCOOH oxidation. Pt3Co alloy with Co electrochemically leached from the surface (Pt skeleton) was employed to separate electronic from ensemble and bifunctional effects of Co. Cyclic voltammetry in 0.1 M HClO4 showed reduced amount of adsorbed hydrogen on Pt sites on Pt3Co alloy compared to pure Pt. However, no significant difference in hydrogen adsorption/desorption and Pt-oxide reduction features between Pt3Co with Pt skeleton structure and bulk Pt was observed. The oxidation of COads on Pt3Co alloy commenced earlier than on Pt, but this effect on Pt3Co with Pt skeleton structure was minor indicating that bifunctional mechanism is stronger than the electronic modification of Pt by Co. The HCOOH oxidation rate on Pt3Co alloy was about seven times higher than on bulk Pt when the reaction rates were compared at 0.4 V, i.e., in the middle of the potential range for the HCOOH oxidation. Like in the case of COads oxidation, Pt skeleton showed similar activity as bulk Pt indicating that the ensemble effect is responsible for the enhanced activity of Pt3Co alloy toward HCOOH oxidation. The comparison of COads and HCOOH oxidation on Pt3Co/C and PtCo/C with the same reaction on Pt/C were qualitatively the same as on bulk materials.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Oxidation of carbon monoxide and formic acid on bulk and nanosized Pt-Co alloys
VL  - 16
IS  - 2
SP  - 587
EP  - 595
DO  - 10.1007/s10008-011-1389-5
ER  - 

@article{
author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.",
year = "2012",
abstract = "Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on high area carbon were investigated as the electrocatalysts for the COads and HCOOH oxidation. Pt3Co alloy with Co electrochemically leached from the surface (Pt skeleton) was employed to separate electronic from ensemble and bifunctional effects of Co. Cyclic voltammetry in 0.1 M HClO4 showed reduced amount of adsorbed hydrogen on Pt sites on Pt3Co alloy compared to pure Pt. However, no significant difference in hydrogen adsorption/desorption and Pt-oxide reduction features between Pt3Co with Pt skeleton structure and bulk Pt was observed. The oxidation of COads on Pt3Co alloy commenced earlier than on Pt, but this effect on Pt3Co with Pt skeleton structure was minor indicating that bifunctional mechanism is stronger than the electronic modification of Pt by Co. The HCOOH oxidation rate on Pt3Co alloy was about seven times higher than on bulk Pt when the reaction rates were compared at 0.4 V, i.e., in the middle of the potential range for the HCOOH oxidation. Like in the case of COads oxidation, Pt skeleton showed similar activity as bulk Pt indicating that the ensemble effect is responsible for the enhanced activity of Pt3Co alloy toward HCOOH oxidation. The comparison of COads and HCOOH oxidation on Pt3Co/C and PtCo/C with the same reaction on Pt/C were qualitatively the same as on bulk materials.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Oxidation of carbon monoxide and formic acid on bulk and nanosized Pt-Co alloys",
volume = "16",
number = "2",
pages = "587-595",
doi = "10.1007/s10008-011-1389-5"
}

Obradović, M., Tripković, A.,& Gojković, S. Lj.. (2012). Oxidation of carbon monoxide and formic acid on bulk and nanosized Pt-Co alloys. in Journal of Solid State Electrochemistry
Springer, New York., 16(2), 587-595.
https://doi.org/10.1007/s10008-011-1389-5

Obradović M, Tripković A, Gojković SL. Oxidation of carbon monoxide and formic acid on bulk and nanosized Pt-Co alloys. in Journal of Solid State Electrochemistry. 2012;16(2):587-595.
doi:10.1007/s10008-011-1389-5 .

Obradović, Maja, Tripković, Amalija, Gojković, Snežana Lj., "Oxidation of carbon monoxide and formic acid on bulk and nanosized Pt-Co alloys" in Journal of Solid State Electrochemistry, 16, no. 2 (2012):587-595,
https://doi.org/10.1007/s10008-011-1389-5 . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Obradović, Maja
AU  - Tripković, Dušan
AU  - Popović, Ksenija
AU  - Jovanović, Vladislava M.
AU  - Gojković, Snežana Lj.
AU  - Tripković, Amalija
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1061
AB  - Formic acid oxidation was studied on a new prepared Pt2Bi characterized by X-ray diffraction spectroscopy (phase composition), scanning tunneling microscopy (STM) (surface morphology), and COads stripping voltammetry (surface composition). Bulk composition of Pt2Bi revealed two phases-55% PtBi alloy and 45% Pt. Estimated contribution of pure Pt on the Pt2Bi surface (43.5%) determined by COads stripping voltammetry corresponds closely to bulk composition. Pt2Bi reveals high activity and stability in formic acid oxidation. High activity originates from the fact that formic acid oxidation proceeds completely through dehydrogenation path based on an ensemble effect. The high stability of Pt2Bi surface is induced by the suppression of Bi leaching as it was evidenced by insignificant changes of surface morphology and surface roughness shown by STM images before and after electrochemical treatment in formic acid containing solution. Pt2Bi is found to be powerful catalyst exhibiting up to two orders of magnitude larger current densities at 0.0 V and onset potential shifted for similar to 0.2 V to more negative value relative to Pt under steady-state condition.
PB  - Springer, New York
T2  - Electrocatalysis
T1  - High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation
VL  - 3
IS  - 3-4
SP  - 346
EP  - 352
DO  - 10.1007/s12678-012-0099-9
ER  - 

@article{
author = "Lović, Jelena and Obradović, Maja and Tripković, Dušan and Popović, Ksenija and Jovanović, Vladislava M. and Gojković, Snežana Lj. and Tripković, Amalija",
year = "2012",
abstract = "Formic acid oxidation was studied on a new prepared Pt2Bi characterized by X-ray diffraction spectroscopy (phase composition), scanning tunneling microscopy (STM) (surface morphology), and COads stripping voltammetry (surface composition). Bulk composition of Pt2Bi revealed two phases-55% PtBi alloy and 45% Pt. Estimated contribution of pure Pt on the Pt2Bi surface (43.5%) determined by COads stripping voltammetry corresponds closely to bulk composition. Pt2Bi reveals high activity and stability in formic acid oxidation. High activity originates from the fact that formic acid oxidation proceeds completely through dehydrogenation path based on an ensemble effect. The high stability of Pt2Bi surface is induced by the suppression of Bi leaching as it was evidenced by insignificant changes of surface morphology and surface roughness shown by STM images before and after electrochemical treatment in formic acid containing solution. Pt2Bi is found to be powerful catalyst exhibiting up to two orders of magnitude larger current densities at 0.0 V and onset potential shifted for similar to 0.2 V to more negative value relative to Pt under steady-state condition.",
publisher = "Springer, New York",
journal = "Electrocatalysis",
title = "High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation",
volume = "3",
number = "3-4",
pages = "346-352",
doi = "10.1007/s12678-012-0099-9"
}

Lović, J., Obradović, M., Tripković, D., Popović, K., Jovanović, V. M., Gojković, S. Lj.,& Tripković, A.. (2012). High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation. in Electrocatalysis
Springer, New York., 3(3-4), 346-352.
https://doi.org/10.1007/s12678-012-0099-9

Lović J, Obradović M, Tripković D, Popović K, Jovanović VM, Gojković SL, Tripković A. High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation. in Electrocatalysis. 2012;3(3-4):346-352.
doi:10.1007/s12678-012-0099-9 .

Lović, Jelena, Obradović, Maja, Tripković, Dušan, Popović, Ksenija, Jovanović, Vladislava M., Gojković, Snežana Lj., Tripković, Amalija, "High Activity and Stability of Pt2Bi Catalyst in Formic Acid Oxidation" in Electrocatalysis, 3, no. 3-4 (2012):346-352,
https://doi.org/10.1007/s12678-012-0099-9 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Rogan, Jelena R.
AU  - Babić, Biljana M.
AU  - Tripković, Amalija
AU  - Gautam, A. R. S.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1086
AB  - Pt-Au nanoparticles supported on high area carbon were prepared by simultaneous reduction of Au and Pt precursors and by reduction of Pt precursor on already prepared Au nanoparticles. The first method produced a solid solution of Pt in Au containing similar to 5% Pt with the remaining Pt on the nanoparticles' surface. For the Pt:Au precursor ratio of 1:4 and 1:9, the surface ratio was found to be 0.70:0.30 and 0.55:0.45, respectively. By the second method with the Pt:Au precursors ratio of 1:12, the surface ratio was 0.30:0.70. The voltammetric peaks of Pt-oxide reduction and CO(ads) oxidation demonstrated electronic modification of Pt by Au in all catalysts. With decreasing Pt:Au surface ratio the activity for HCOOH oxidation increases and surface coverage by CO(ads) decreases. The highest activity under potentiodynamic and quasi steady-state conditions without poisoning by CO(ads) was observed for the catalyst with the lowest Pt:Au surface ratio. Chronoamperometic test showed that its high catalytic activity is associated with a high deactivation rate. It was postulated that too strong adsorption of a reactive or non-reactive intermediate caused by electron modification of Pt by underlying Au, is responsible for the deactivation. This result stresses that high Pt dispersion, necessary for promotion of the dehydrogenation path in HCOOH oxidation, can produce too strong adsorption of intermediates causing deactivation of the catalyst.
PB  - Elsevier
T2  - Journal of Power Sources
T1  - Formic acid oxidation on Pt-Au nanoparticles: Relation between the catalyst activity and the poisoning rate
VL  - 197
SP  - 72
EP  - 79
DO  - 10.1016/j.jpowsour.2011.09.043
ER  - 

@article{
author = "Obradović, Maja and Rogan, Jelena R. and Babić, Biljana M. and Tripković, Amalija and Gautam, A. R. S. and Radmilović, Velimir R. and Gojković, Snežana Lj.",
year = "2012",
abstract = "Pt-Au nanoparticles supported on high area carbon were prepared by simultaneous reduction of Au and Pt precursors and by reduction of Pt precursor on already prepared Au nanoparticles. The first method produced a solid solution of Pt in Au containing similar to 5% Pt with the remaining Pt on the nanoparticles' surface. For the Pt:Au precursor ratio of 1:4 and 1:9, the surface ratio was found to be 0.70:0.30 and 0.55:0.45, respectively. By the second method with the Pt:Au precursors ratio of 1:12, the surface ratio was 0.30:0.70. The voltammetric peaks of Pt-oxide reduction and CO(ads) oxidation demonstrated electronic modification of Pt by Au in all catalysts. With decreasing Pt:Au surface ratio the activity for HCOOH oxidation increases and surface coverage by CO(ads) decreases. The highest activity under potentiodynamic and quasi steady-state conditions without poisoning by CO(ads) was observed for the catalyst with the lowest Pt:Au surface ratio. Chronoamperometic test showed that its high catalytic activity is associated with a high deactivation rate. It was postulated that too strong adsorption of a reactive or non-reactive intermediate caused by electron modification of Pt by underlying Au, is responsible for the deactivation. This result stresses that high Pt dispersion, necessary for promotion of the dehydrogenation path in HCOOH oxidation, can produce too strong adsorption of intermediates causing deactivation of the catalyst.",
publisher = "Elsevier",
journal = "Journal of Power Sources",
title = "Formic acid oxidation on Pt-Au nanoparticles: Relation between the catalyst activity and the poisoning rate",
volume = "197",
pages = "72-79",
doi = "10.1016/j.jpowsour.2011.09.043"
}

Obradović, M., Rogan, J. R., Babić, B. M., Tripković, A., Gautam, A. R. S., Radmilović, V. R.,& Gojković, S. Lj.. (2012). Formic acid oxidation on Pt-Au nanoparticles: Relation between the catalyst activity and the poisoning rate. in Journal of Power Sources
Elsevier., 197, 72-79.
https://doi.org/10.1016/j.jpowsour.2011.09.043

Obradović M, Rogan JR, Babić BM, Tripković A, Gautam ARS, Radmilović VR, Gojković SL. Formic acid oxidation on Pt-Au nanoparticles: Relation between the catalyst activity and the poisoning rate. in Journal of Power Sources. 2012;197:72-79.
doi:10.1016/j.jpowsour.2011.09.043 .

Obradović, Maja, Rogan, Jelena R., Babić, Biljana M., Tripković, Amalija, Gautam, A. R. S., Radmilović, Velimir R., Gojković, Snežana Lj., "Formic acid oxidation on Pt-Au nanoparticles: Relation between the catalyst activity and the poisoning rate" in Journal of Power Sources, 197 (2012):72-79,
https://doi.org/10.1016/j.jpowsour.2011.09.043 . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Rogan, Jelena R.
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1104
AB  - High surface area carbon-supported Pt, PtRh, and PtSn catalysts were synthesized by microwave-assisted polyol procedure and tested for ethanol oxidation in perchloric acid. The catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning tunnelling microscopy (STM), TEM, and EDX techniques. STM analysis of unsupported catalysts shows that small particles (similar to 2 nm) with a narrow size distribution are obtained. TEM and XRD examinations of supported catalysts revealed an increase in particle size upon deposition on carbon support (diameter similar to aEuro parts per thousand 3 nm). The diffraction peaks of the bimetallic catalysts in X-ray diffraction patterns are slightly shifted to lower (PtSn/C) or higher (PtRh/C) 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation. Oxidation of ethanol is significantly improved at PtSn/C with the onset potential shifted for similar to aEuro parts per thousand 150 mV to more negative values and the increase of activity for approximately three times in comparison to Pt/C catalyst. This is the lowest onset potential found for ethanol oxidation at PtSn catalysts with a similar composition. Chronoamperometric measurements confirmed that PtSn/C is notably less poisoned than Pt/C catalyst. PtRh/C catalyst exhibited mild enhancement of overall electrochemical reaction in comparison to Pt/C.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation
VL  - 16
IS  - 10
SP  - 3147
EP  - 3157
DO  - 10.1007/s10008-012-1755-y
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Rogan, Jelena R. and Popović, Ksenija and Lović, Jelena and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2012",
abstract = "High surface area carbon-supported Pt, PtRh, and PtSn catalysts were synthesized by microwave-assisted polyol procedure and tested for ethanol oxidation in perchloric acid. The catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning tunnelling microscopy (STM), TEM, and EDX techniques. STM analysis of unsupported catalysts shows that small particles (similar to 2 nm) with a narrow size distribution are obtained. TEM and XRD examinations of supported catalysts revealed an increase in particle size upon deposition on carbon support (diameter similar to aEuro parts per thousand 3 nm). The diffraction peaks of the bimetallic catalysts in X-ray diffraction patterns are slightly shifted to lower (PtSn/C) or higher (PtRh/C) 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation. Oxidation of ethanol is significantly improved at PtSn/C with the onset potential shifted for similar to aEuro parts per thousand 150 mV to more negative values and the increase of activity for approximately three times in comparison to Pt/C catalyst. This is the lowest onset potential found for ethanol oxidation at PtSn catalysts with a similar composition. Chronoamperometric measurements confirmed that PtSn/C is notably less poisoned than Pt/C catalyst. PtRh/C catalyst exhibited mild enhancement of overall electrochemical reaction in comparison to Pt/C.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation",
volume = "16",
number = "10",
pages = "3147-3157",
doi = "10.1007/s10008-012-1755-y"
}

Stevanović, S., Tripković, D., Rogan, J. R., Popović, K., Lović, J., Tripković, A.,& Jovanović, V. M.. (2012). Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation. in Journal of Solid State Electrochemistry
Springer, New York., 16(10), 3147-3157.
https://doi.org/10.1007/s10008-012-1755-y

Stevanović S, Tripković D, Rogan JR, Popović K, Lović J, Tripković A, Jovanović VM. Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation. in Journal of Solid State Electrochemistry. 2012;16(10):3147-3157.
doi:10.1007/s10008-012-1755-y .

Stevanović, Sanja, Tripković, Dušan, Rogan, Jelena R., Popović, Ksenija, Lović, Jelena, Tripković, Amalija, Jovanović, Vladislava M., "Microwave-assisted polyol synthesis of carbon-supported platinum-based bimetallic catalysts for ethanol oxidation" in Journal of Solid State Electrochemistry, 16, no. 10 (2012):3147-3157,
https://doi.org/10.1007/s10008-012-1755-y . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Popović, Ksenija
AU  - Tripković, Amalija
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1085
AB  - The electrocatalytic activity of carbon supported PtRu/C catalysts, with different composition, toward the electrooxidation of methanol, CO and formic acid were examined in acid and alkaline solution at ambient temperature using the thin-film rotating disk electrode (RDE) method and compared with activity of Pt/C. The catalysts were characterized by XRD, AFM and STM techniques. XRD pattern revealed that PtRu-1/C catalyst is consisted of two structures e.g. Pt-Ru-fcc and Ru-hcp (the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru), as opposed to PtRu-2/C catalyst which is consisted of one structure mostly, Pt-Ru-fcc. According to STM images, PtRu as well as Pt, the particle sizes ranged between 2 and 6 nm, which is in a good agreement with the mean particles size determined by XRD. To establish the activity and stability of the catalysts potentiodynamic and quasi steady-state measurements were performed. It was found that the activity of Pt and PtRu for CO and methanol oxidation is a strong function of pH of solution. The kinetics are much faster in alkaline than in acid solution and the difference between Pt/C and PtRu/C is much less pronounced in alkaline media. The results presented in this work indicate that the activity of PtRu catalysts depends on catalyst composition, e.g., on the Pt/Ru atomic ratio, as well as on the alloying degree of catalysts. Comparison of CO, methanol and formic acid oxidation on PtRu-2/C, PtRu-1/C and Pt/C catalysts revealed that PtRu-2/C is the most active one. It was shown that the PtRu-2/C catalyst, due to fact that it consists of only one phase, with a high alloying degree, through the bifunctional mechanism improved by the electronic effect, achieved activity twice as high as PtRu-1/C in oxidation of all organic molecules investigated, and about three times higher than Pt/C in the oxidation of methanol and CO, and five times higher in formic acid oxidation.
AB  - Oksidacija metanola, mravlje kiseline i ugljen monoksida ispitivana je na nanočesticama različitih legura PtRu (PtRu/C), i dobijene aktivnosti su upoređene sa aktivnostima na nanostrukturnom platinskom katalizatoru (Pt/C). Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i mikroskopskim tehnikama: mikroskopijom atomskih sila (AFM) i skenirajućom tunelirajućom mikroskopijom (STM). Elektrokatalitičke osobine svih katalizatora ispitivane su potenciodinamičkim i kvazi-stacionarnim merenjima u alkalnoj i kiseloj sredini. Pokazano je da su odgovarajuće elektrode za red veličine aktivnije u alkalnoj u odnosu na kiselu sredinu. Takođe, razlika u aktivnosti između Pt/C i obe PtRu/C elektrode je manje izražena u alkalnoj sredini. Rezultati elektrohemijskih merenja pokazali su da aktivnost katalizatora PtRu/C zavisi od sastava tj. određena je odgovarajućim Pt/Ru odnosom i stepenom legiranja. Tako je za oksidaciju malih organskih molekula elektroda PtRu-2/C aktivnija od PtRu-1/C. Prisustvo jedne faze u katalizatoru PtRu-2/C, veći stepen legiranja, više Pt/Ru parova čini da ovaj katalizator ima oko dva puta veću aktivnost u svim posmatranim reakcijama u odnosu na PtRu-1/C i oko tri puta u odnosu na Pt/C za oksidaciju metanola i CO, odnosno pet puta za oksidaciju mravlje kiseline.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst
T1  - Elektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/C
VL  - 66
IS  - 3
SP  - 335
EP  - 347
DO  - 10.2298/HEMIND111018104L
ER  - 

@article{
author = "Lović, Jelena and Popović, Ksenija and Tripković, Amalija",
year = "2012",
abstract = "The electrocatalytic activity of carbon supported PtRu/C catalysts, with different composition, toward the electrooxidation of methanol, CO and formic acid were examined in acid and alkaline solution at ambient temperature using the thin-film rotating disk electrode (RDE) method and compared with activity of Pt/C. The catalysts were characterized by XRD, AFM and STM techniques. XRD pattern revealed that PtRu-1/C catalyst is consisted of two structures e.g. Pt-Ru-fcc and Ru-hcp (the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru), as opposed to PtRu-2/C catalyst which is consisted of one structure mostly, Pt-Ru-fcc. According to STM images, PtRu as well as Pt, the particle sizes ranged between 2 and 6 nm, which is in a good agreement with the mean particles size determined by XRD. To establish the activity and stability of the catalysts potentiodynamic and quasi steady-state measurements were performed. It was found that the activity of Pt and PtRu for CO and methanol oxidation is a strong function of pH of solution. The kinetics are much faster in alkaline than in acid solution and the difference between Pt/C and PtRu/C is much less pronounced in alkaline media. The results presented in this work indicate that the activity of PtRu catalysts depends on catalyst composition, e.g., on the Pt/Ru atomic ratio, as well as on the alloying degree of catalysts. Comparison of CO, methanol and formic acid oxidation on PtRu-2/C, PtRu-1/C and Pt/C catalysts revealed that PtRu-2/C is the most active one. It was shown that the PtRu-2/C catalyst, due to fact that it consists of only one phase, with a high alloying degree, through the bifunctional mechanism improved by the electronic effect, achieved activity twice as high as PtRu-1/C in oxidation of all organic molecules investigated, and about three times higher than Pt/C in the oxidation of methanol and CO, and five times higher in formic acid oxidation., Oksidacija metanola, mravlje kiseline i ugljen monoksida ispitivana je na nanočesticama različitih legura PtRu (PtRu/C), i dobijene aktivnosti su upoređene sa aktivnostima na nanostrukturnom platinskom katalizatoru (Pt/C). Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i mikroskopskim tehnikama: mikroskopijom atomskih sila (AFM) i skenirajućom tunelirajućom mikroskopijom (STM). Elektrokatalitičke osobine svih katalizatora ispitivane su potenciodinamičkim i kvazi-stacionarnim merenjima u alkalnoj i kiseloj sredini. Pokazano je da su odgovarajuće elektrode za red veličine aktivnije u alkalnoj u odnosu na kiselu sredinu. Takođe, razlika u aktivnosti između Pt/C i obe PtRu/C elektrode je manje izražena u alkalnoj sredini. Rezultati elektrohemijskih merenja pokazali su da aktivnost katalizatora PtRu/C zavisi od sastava tj. određena je odgovarajućim Pt/Ru odnosom i stepenom legiranja. Tako je za oksidaciju malih organskih molekula elektroda PtRu-2/C aktivnija od PtRu-1/C. Prisustvo jedne faze u katalizatoru PtRu-2/C, veći stepen legiranja, više Pt/Ru parova čini da ovaj katalizator ima oko dva puta veću aktivnost u svim posmatranim reakcijama u odnosu na PtRu-1/C i oko tri puta u odnosu na Pt/C za oksidaciju metanola i CO, odnosno pet puta za oksidaciju mravlje kiseline.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst, Elektrokatalitičke osobine nanočestica legura PtRu/C u oksidaciji malih organskih molekula - poređenje sa katalizatorom Pt/C",
volume = "66",
number = "3",
pages = "335-347",
doi = "10.2298/HEMIND111018104L"
}

Lović, J., Popović, K.,& Tripković, A.. (2012). The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst. in Hemijska industrija
Association of Chemical Engineers of Serbia., 66(3), 335-347.
https://doi.org/10.2298/HEMIND111018104L

Lović J, Popović K, Tripković A. The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst. in Hemijska industrija. 2012;66(3):335-347.
doi:10.2298/HEMIND111018104L .

Lović, Jelena, Popović, Ksenija, Tripković, Amalija, "The electrocatalytic properties of carbon supported PtRu/C nanoalloys in oxidation of small organic molecules: Comparison with Pt/C catalyst" in Hemijska industrija, 66, no. 3 (2012):335-347,
https://doi.org/10.2298/HEMIND111018104L . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Dekanski, Aleksandar
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/979
AB  - We report on new insights into the relationships between structure and activity of glassy carbon (GC), as a model material for electrocatalyst support, during its anodization in acid solution. Our investigation strongly confirms the role of CFGs in promotion of Pt activity by the "spill-over'' effect related to COads for methanol electrooxidation (MEO) on a carbon-supported Pt catalyst. Combined analysis of voltammetric and impedance behaviour as well as changes in GC surface morphology induced by intensification of anodizing conditions reveal an intrinsic influence of the carbon functionalization and the structure of a graphene oxide (GO) layer on the electrical and electrocatalytic properties of activated GC. Although GO continuously grows during anodization, it structurally changes from being a graphite inter-layer within graphite ribbons toward a continuous GO surface layer that deteriorates the native structure of GC. As a consequence of the increased distance between GO-spaced graphite layers, the GC conductivity decreases until the case of profound GO exfoliation under drastic anodizing conditions. This exposes the native, yet abundantly functionalized, GC texture. While GC capacitance continuously increases with intensification of anodizing conditions, the surface nano-roughness and GO resistance reach the highest values at modest anodizing conditions, and then decrease upon drastic anodization due to the onset of GO exfoliation. We found for the first time that the activity of a GC-supported Pt catalyst in MEO, as one of the promising half-reactions in polymer electrolyte fuel cells, strictly follows the changes in GC nano-roughness and GO-induced GC resistance. The highest GC/Pt MEO activity is reached when optimal distance between graphite layers and optimal degree of GC functionalization bring the highest amount of CFGs into intimate contact with the Pt surface. This confirms the promoting role of CFGs in MEO catalysis.
PB  - Royal Soc Chemistry, Cambridge
T2  - Physical Chemistry Chemical Physics
T1  - Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts
VL  - 14
IS  - 26
SP  - 9475
EP  - 9485
DO  - 10.1039/c2cp40455a
ER  - 

@article{
author = "Stevanović, Sanja and Panić, Vladimir and Dekanski, Aleksandar and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2012",
abstract = "We report on new insights into the relationships between structure and activity of glassy carbon (GC), as a model material for electrocatalyst support, during its anodization in acid solution. Our investigation strongly confirms the role of CFGs in promotion of Pt activity by the "spill-over'' effect related to COads for methanol electrooxidation (MEO) on a carbon-supported Pt catalyst. Combined analysis of voltammetric and impedance behaviour as well as changes in GC surface morphology induced by intensification of anodizing conditions reveal an intrinsic influence of the carbon functionalization and the structure of a graphene oxide (GO) layer on the electrical and electrocatalytic properties of activated GC. Although GO continuously grows during anodization, it structurally changes from being a graphite inter-layer within graphite ribbons toward a continuous GO surface layer that deteriorates the native structure of GC. As a consequence of the increased distance between GO-spaced graphite layers, the GC conductivity decreases until the case of profound GO exfoliation under drastic anodizing conditions. This exposes the native, yet abundantly functionalized, GC texture. While GC capacitance continuously increases with intensification of anodizing conditions, the surface nano-roughness and GO resistance reach the highest values at modest anodizing conditions, and then decrease upon drastic anodization due to the onset of GO exfoliation. We found for the first time that the activity of a GC-supported Pt catalyst in MEO, as one of the promising half-reactions in polymer electrolyte fuel cells, strictly follows the changes in GC nano-roughness and GO-induced GC resistance. The highest GC/Pt MEO activity is reached when optimal distance between graphite layers and optimal degree of GC functionalization bring the highest amount of CFGs into intimate contact with the Pt surface. This confirms the promoting role of CFGs in MEO catalysis.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Physical Chemistry Chemical Physics",
title = "Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts",
volume = "14",
number = "26",
pages = "9475-9485",
doi = "10.1039/c2cp40455a"
}

Stevanović, S., Panić, V., Dekanski, A., Tripković, A.,& Jovanović, V. M.. (2012). Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts. in Physical Chemistry Chemical Physics
Royal Soc Chemistry, Cambridge., 14(26), 9475-9485.
https://doi.org/10.1039/c2cp40455a

Stevanović S, Panić V, Dekanski A, Tripković A, Jovanović VM. Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts. in Physical Chemistry Chemical Physics. 2012;14(26):9475-9485.
doi:10.1039/c2cp40455a .

Stevanović, Sanja, Panić, Vladimir, Dekanski, Aleksandar, Tripković, Amalija, Jovanović, Vladislava M., "Relationships between structure and activity of carbon as a multifunctional support for electrocatalysts" in Physical Chemistry Chemical Physics, 14, no. 26 (2012):9475-9485,
https://doi.org/10.1039/c2cp40455a . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Poleti, Dejan
AU  - Rogan, Jelena R.
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/794
AB  - Carbon-supported Pt and Pt-Rh-Sn catalysts were synthesized by the microwave-polyol method in ethylene glycol solution and were investigated in the ethanol electro-oxidation reaction. The catalysts were characterized in terms of structure, morphology and composition employing the X-ray diffraction (XRD), scanning tunneling microscopy and energy-dispersive X-ray spectroscopy techniques. The STM analysis indicated rather uniform particles and particle sizes below 2 nm for both catalysts. The XRD analysis of the Pt/C catalyst revealed two phases, one with the main characteristic peaks of the face-centered cubic crystal structure (fcc) of platinum and the other related to the graphite-like structure of the carbon support, Vulcan XC-72R. However, in the XRD pattern of the Pt-Rh-Sn/C catalyst, diffraction peaks for Pt, Rh or Sn could not be resolved, indicating extremely low crystallinity. The small particle sizes and homogeneous size distributions of both catalysts could be attributed to the advantages of the microwave-assisted modified polyol process in ethylene glycol solution. The Pt-Rh-Sn/C catalyst was highly active for ethanol oxidation with the onset potential shifted by more than 150 mV to more negative values and with currents nearly 5 times higher in comparison to the Pt/C catalyst. The stability tests of the catalysts, as studied by chronoamperometric experiments, revealed that the Pt-Rh-Sn/C catalyst was evidently less poisoned than the Pt/C catalyst. The increased activity of Pt-Rh-Sn/C in comparison to Pt/C catalyst was most probably promoted by the bi-functional mechanism and the electronic effect of the alloyed metals.
AB  - Pt i Pt-Rh-Sn katalizatori na ugljeniku razvijene površine su sintetizovani poliol-mikrotalasnim postupkom u rastvoru etilenglikola i ispitivani za reakciju eletrohemijske oksidacije etanola u kiseloj sredini. Katalizatori su okarakterisani strukturno, morfološki i po sastavu korišćenjem XRD, STM i EDX tehnika. STM analiza je potvrdila da su Pt i Pt-Rh-Sn čestice uniformne veličine i prečnika manjeg od 2 nm. XRD analiza Pt/C katalizatora pokazala je prisustvo dve faze, jedne sa glavnim karakterističnim pikovima za pljosno-centriranu kubnu kristalnu strukturu platine (111, 200, 220 i 311) i druge sa difrakcionim pikom na 2q oko 25° karakterističnim za heksagonalnu strukturu vulkana XC-72R (ugljeničnog nosača). XRD analiza Pt-Rh-Sn/C katalizatora nije pokazala karakteristične pikove, što je indikacija veoma male kristaličnosti katalizatora. Aktivnost katalizatora ispitivana je potenciodinamičkim i hronoamperometrijskim merenjima. Pt-Rh-Sn/C katalizator je veoma aktivan za oksidaciju etanola sa početkom reakcije na potencijalima za oko 150 mV pomerenim ka negativnijim vrednostima i strujama koje su oko pet puta veće u poređenju sa Pt/C katalizatorom. Stabilnost katalizatora ispitivana hronoamperometrijski pokazala je da se Pt-Rh-Sn/C katalizator manje truje od Pt/C katalizatora. Mala veličina i homogena distribucija čestica mogu se pripisati prednostima mikrotalasne sinteze i modifikovanog poliol postupka u rastvoru etilenglikola. Veća aktivnost Pt-Rh-Sn/C katalizatora u poređenju sa Pt/C katalizatorom posledica je bi-funkcionalnog mehanizma i elektronskog (ligand) efekta metala u sintetizovanoj leguri.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation
T1  - Mikrotalasna sinteza i karakterizacija Pt i Pt-Rh-Sn katalizatora za oksidaciju etanola
VL  - 76
IS  - 12
SP  - 1673
EP  - 1685
DO  - 10.2298/JSC110405166S
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Poleti, Dejan and Rogan, Jelena R. and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2011",
abstract = "Carbon-supported Pt and Pt-Rh-Sn catalysts were synthesized by the microwave-polyol method in ethylene glycol solution and were investigated in the ethanol electro-oxidation reaction. The catalysts were characterized in terms of structure, morphology and composition employing the X-ray diffraction (XRD), scanning tunneling microscopy and energy-dispersive X-ray spectroscopy techniques. The STM analysis indicated rather uniform particles and particle sizes below 2 nm for both catalysts. The XRD analysis of the Pt/C catalyst revealed two phases, one with the main characteristic peaks of the face-centered cubic crystal structure (fcc) of platinum and the other related to the graphite-like structure of the carbon support, Vulcan XC-72R. However, in the XRD pattern of the Pt-Rh-Sn/C catalyst, diffraction peaks for Pt, Rh or Sn could not be resolved, indicating extremely low crystallinity. The small particle sizes and homogeneous size distributions of both catalysts could be attributed to the advantages of the microwave-assisted modified polyol process in ethylene glycol solution. The Pt-Rh-Sn/C catalyst was highly active for ethanol oxidation with the onset potential shifted by more than 150 mV to more negative values and with currents nearly 5 times higher in comparison to the Pt/C catalyst. The stability tests of the catalysts, as studied by chronoamperometric experiments, revealed that the Pt-Rh-Sn/C catalyst was evidently less poisoned than the Pt/C catalyst. The increased activity of Pt-Rh-Sn/C in comparison to Pt/C catalyst was most probably promoted by the bi-functional mechanism and the electronic effect of the alloyed metals., Pt i Pt-Rh-Sn katalizatori na ugljeniku razvijene površine su sintetizovani poliol-mikrotalasnim postupkom u rastvoru etilenglikola i ispitivani za reakciju eletrohemijske oksidacije etanola u kiseloj sredini. Katalizatori su okarakterisani strukturno, morfološki i po sastavu korišćenjem XRD, STM i EDX tehnika. STM analiza je potvrdila da su Pt i Pt-Rh-Sn čestice uniformne veličine i prečnika manjeg od 2 nm. XRD analiza Pt/C katalizatora pokazala je prisustvo dve faze, jedne sa glavnim karakterističnim pikovima za pljosno-centriranu kubnu kristalnu strukturu platine (111, 200, 220 i 311) i druge sa difrakcionim pikom na 2q oko 25° karakterističnim za heksagonalnu strukturu vulkana XC-72R (ugljeničnog nosača). XRD analiza Pt-Rh-Sn/C katalizatora nije pokazala karakteristične pikove, što je indikacija veoma male kristaličnosti katalizatora. Aktivnost katalizatora ispitivana je potenciodinamičkim i hronoamperometrijskim merenjima. Pt-Rh-Sn/C katalizator je veoma aktivan za oksidaciju etanola sa početkom reakcije na potencijalima za oko 150 mV pomerenim ka negativnijim vrednostima i strujama koje su oko pet puta veće u poređenju sa Pt/C katalizatorom. Stabilnost katalizatora ispitivana hronoamperometrijski pokazala je da se Pt-Rh-Sn/C katalizator manje truje od Pt/C katalizatora. Mala veličina i homogena distribucija čestica mogu se pripisati prednostima mikrotalasne sinteze i modifikovanog poliol postupka u rastvoru etilenglikola. Veća aktivnost Pt-Rh-Sn/C katalizatora u poređenju sa Pt/C katalizatorom posledica je bi-funkcionalnog mehanizma i elektronskog (ligand) efekta metala u sintetizovanoj leguri.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation, Mikrotalasna sinteza i karakterizacija Pt i Pt-Rh-Sn katalizatora za oksidaciju etanola",
volume = "76",
number = "12",
pages = "1673-1685",
doi = "10.2298/JSC110405166S"
}

Stevanović, S., Tripković, D., Poleti, D., Rogan, J. R., Tripković, A.,& Jovanović, V. M.. (2011). Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 76(12), 1673-1685.
https://doi.org/10.2298/JSC110405166S

Stevanović S, Tripković D, Poleti D, Rogan JR, Tripković A, Jovanović VM. Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation. in Journal of the Serbian Chemical Society. 2011;76(12):1673-1685.
doi:10.2298/JSC110405166S .

Stevanović, Sanja, Tripković, Dušan, Poleti, Dejan, Rogan, Jelena R., Tripković, Amalija, Jovanović, Vladislava M., "Microwave synthesis and characterization of Pt and Pt-Rh-Sn electrocatalysts for ethanol oxidation" in Journal of the Serbian Chemical Society, 76, no. 12 (2011):1673-1685,
https://doi.org/10.2298/JSC110405166S . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Rogan, Jelena R.
AU  - Minic, D.
AU  - Gavrilović, Aleksandra
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/821
AB  - High surface area carbon supported Pt and Pt3Sn catalysts were synthesized by microwave irradiation and investigated in the ethanol electro-oxidation reaction. The catalysts were obtained using a modified polyol method in an ethylene glycol solution and were characterized in terms of structure, morphology and composition by employing XRD, STM and EDX techniques. The diffraction peaks of Pt3Sn/C catalyst in XRD patterns are shifted to lower 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation between Pt and Sn. Particle size analysis from STM and XRD shows that Pt and Pt3Sn clusters are of a small diameter (similar to 2 nm) with a narrow size distribution. Pt3Sn/C catalyst is highly active in ethanol oxidation with the onset potential shifted for similar to 150 mV to more negative values and with similar to 2 times higher currents in comparison to Pt/C.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation
VL  - 85
IS  - 13
SP  - 2299
EP  - 2304
DO  - 10.1134/S0036024411130309
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Rogan, Jelena R. and Minic, D. and Gavrilović, Aleksandra and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2011",
abstract = "High surface area carbon supported Pt and Pt3Sn catalysts were synthesized by microwave irradiation and investigated in the ethanol electro-oxidation reaction. The catalysts were obtained using a modified polyol method in an ethylene glycol solution and were characterized in terms of structure, morphology and composition by employing XRD, STM and EDX techniques. The diffraction peaks of Pt3Sn/C catalyst in XRD patterns are shifted to lower 2 theta values with respect to the corresponding peaks at Pt/C catalyst as a consequence of alloy formation between Pt and Sn. Particle size analysis from STM and XRD shows that Pt and Pt3Sn clusters are of a small diameter (similar to 2 nm) with a narrow size distribution. Pt3Sn/C catalyst is highly active in ethanol oxidation with the onset potential shifted for similar to 150 mV to more negative values and with similar to 2 times higher currents in comparison to Pt/C.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation",
volume = "85",
number = "13",
pages = "2299-2304",
doi = "10.1134/S0036024411130309"
}

Stevanović, S., Tripković, D., Rogan, J. R., Minic, D., Gavrilović, A., Tripković, A.,& Jovanović, V. M.. (2011). Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 85(13), 2299-2304.
https://doi.org/10.1134/S0036024411130309

Stevanović S, Tripković D, Rogan JR, Minic D, Gavrilović A, Tripković A, Jovanović VM. Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation. in Russian Journal of Physical Chemistry A. 2011;85(13):2299-2304.
doi:10.1134/S0036024411130309 .

Stevanović, Sanja, Tripković, Dušan, Rogan, Jelena R., Minic, D., Gavrilović, Aleksandra, Tripković, Amalija, Jovanović, Vladislava M., "Enhanced activity in ethanol oxidation of Pt3Sn electrocatalysts synthesized by microwave irradiation" in Russian Journal of Physical Chemistry A, 85, no. 13 (2011):2299-2304,
https://doi.org/10.1134/S0036024411130309 . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Popović, Ksenija
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/817
AB  - The oxidation of ethanol was studied at Snad-, Ruad- and Rhad-modified and unmodified PtC, Pt3Sn/C and Pt3Ru2/C catalysts. Potentiodynamic, quasi-steady-state and chronoamperometric measurements were used to investtigate the activity and stability of the catalysts. Irreversible adsorption of a small amount of each of the adatoms (≈10 % surface coverage) enhanced the activity of the Pt/C and Pt3Sn/C catalysts. The onset potential was shifted by ≈50 mV towards lower values and the current densities over the whole studied potential region were up to two times higher with respect to the unmodified catalysts. On the other hand, the addition of Snad or Rhad slightly increased the activity of Pt3Ru2/C, while the presence of Ruad decreased its activity for ethanol oxidation. The catalytic action of Snad and Ruad was associated mostly with their ability to adsorb oxygen-containing species at lower potentials than Pt, permitting a bifunctional mechanism to proceed. Rhad also acted on the C-C bond breaking activation as well as source of oxygen containing species, increasing in this way the activity of the modified surfaces for ethanol oxidation.
AB  - Oksidacija etanola je ispitivana na Pt/C, Pt3Sn/C i Pt3Ru2/C katalizatorima modifikovanim ireverizibilno adsorbovanim Snad, Ruad i Rhad adatomima. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, hronoamperometrijskim i kvazi-stacionarnim merenjima. Dobijeni rezultati su pokazali da mala količina ireverzibilno adsorbovanih adatoma (10 %) povećava aktivnost Pt/C i Pt3Sn/C katalizatora. Početak reakcije je pomeren ka negativnijim vrednostima za ≈50 mV i dobijene su oko dva puta veće gustine struje u poređenju sa nemodifikovanim katalizatorima. Dodatak Snad ili Rhad malo povećava aktivnost Pt3Ru2/C katalizatora, dok dodatak Ruad smanjuje njegovu aktivnost za oksidaciju etanola. Katalitička aktivnost adatoma Sn i Ru se uglavnom vezuje sa njihovom sposobnošću da adsorbuju OH čestice na nižim potencijalima od Pt i na taj način poboljšavaju bifunkcionalni mehanizam reakcije. Povećana aktivnost katalizatora modifikovanih adatomima Rh može se objasniti lakšim kidanjem C-C veze u etanolu, kao i povećanom količinom OHad čestica na Rh mestima.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Impact of the modification of carbon-supported, Pt-based catalysts by irreversibly adsorbed Sn, Ru and Rh on ethanol oxidation
T1  - Uticaj modifikacije platinskih nanokatalizatora ireverzibilnom adsorpcijom Sn, Ru i Rh na oksidaciju etanola
VL  - 76
IS  - 11
SP  - 1523
EP  - 1536
DO  - 10.2298/JSC110217136L
ER  - 

@article{
author = "Lović, Jelena and Tripković, Amalija and Popović, Ksenija",
year = "2011",
abstract = "The oxidation of ethanol was studied at Snad-, Ruad- and Rhad-modified and unmodified PtC, Pt3Sn/C and Pt3Ru2/C catalysts. Potentiodynamic, quasi-steady-state and chronoamperometric measurements were used to investtigate the activity and stability of the catalysts. Irreversible adsorption of a small amount of each of the adatoms (≈10 % surface coverage) enhanced the activity of the Pt/C and Pt3Sn/C catalysts. The onset potential was shifted by ≈50 mV towards lower values and the current densities over the whole studied potential region were up to two times higher with respect to the unmodified catalysts. On the other hand, the addition of Snad or Rhad slightly increased the activity of Pt3Ru2/C, while the presence of Ruad decreased its activity for ethanol oxidation. The catalytic action of Snad and Ruad was associated mostly with their ability to adsorb oxygen-containing species at lower potentials than Pt, permitting a bifunctional mechanism to proceed. Rhad also acted on the C-C bond breaking activation as well as source of oxygen containing species, increasing in this way the activity of the modified surfaces for ethanol oxidation., Oksidacija etanola je ispitivana na Pt/C, Pt3Sn/C i Pt3Ru2/C katalizatorima modifikovanim ireverizibilno adsorbovanim Snad, Ruad i Rhad adatomima. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, hronoamperometrijskim i kvazi-stacionarnim merenjima. Dobijeni rezultati su pokazali da mala količina ireverzibilno adsorbovanih adatoma (10 %) povećava aktivnost Pt/C i Pt3Sn/C katalizatora. Početak reakcije je pomeren ka negativnijim vrednostima za ≈50 mV i dobijene su oko dva puta veće gustine struje u poređenju sa nemodifikovanim katalizatorima. Dodatak Snad ili Rhad malo povećava aktivnost Pt3Ru2/C katalizatora, dok dodatak Ruad smanjuje njegovu aktivnost za oksidaciju etanola. Katalitička aktivnost adatoma Sn i Ru se uglavnom vezuje sa njihovom sposobnošću da adsorbuju OH čestice na nižim potencijalima od Pt i na taj način poboljšavaju bifunkcionalni mehanizam reakcije. Povećana aktivnost katalizatora modifikovanih adatomima Rh može se objasniti lakšim kidanjem C-C veze u etanolu, kao i povećanom količinom OHad čestica na Rh mestima.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Impact of the modification of carbon-supported, Pt-based catalysts by irreversibly adsorbed Sn, Ru and Rh on ethanol oxidation, Uticaj modifikacije platinskih nanokatalizatora ireverzibilnom adsorpcijom Sn, Ru i Rh na oksidaciju etanola",
volume = "76",
number = "11",
pages = "1523-1536",
doi = "10.2298/JSC110217136L"
}

Lović, J., Tripković, A.,& Popović, K.. (2011). Impact of the modification of carbon-supported, Pt-based catalysts by irreversibly adsorbed Sn, Ru and Rh on ethanol oxidation. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 76(11), 1523-1536.
https://doi.org/10.2298/JSC110217136L

Lović J, Tripković A, Popović K. Impact of the modification of carbon-supported, Pt-based catalysts by irreversibly adsorbed Sn, Ru and Rh on ethanol oxidation. in Journal of the Serbian Chemical Society. 2011;76(11):1523-1536.
doi:10.2298/JSC110217136L .

Lović, Jelena, Tripković, Amalija, Popović, Ksenija, "Impact of the modification of carbon-supported, Pt-based catalysts by irreversibly adsorbed Sn, Ru and Rh on ethanol oxidation" in Journal of the Serbian Chemical Society, 76, no. 11 (2011):1523-1536,
https://doi.org/10.2298/JSC110217136L . .

TY  - CONF
AU  - Obradović, Maja
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3536
AB  - Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Oxidation of formic acid on bulk and nanosized Pt-Co alloys
SP  - 57
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_cer_3536
ER  - 

@conference{
author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.",
year = "2010",
abstract = "Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Oxidation of formic acid on bulk and nanosized Pt-Co alloys",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_cer_3536"
}

Obradović, M., Tripković, A.,& Gojković, S. Lj.. (2010). Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Serbian Chemical Society, Belgrade., 57-57.
https://hdl.handle.net/21.15107/rcub_cer_3536

Obradović M, Tripković A, Gojković SL. Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2010;:57-57.
https://hdl.handle.net/21.15107/rcub_cer_3536 .

Obradović, Maja, Tripković, Amalija, Gojković, Snežana Lj., "Oxidation of formic acid on bulk and nanosized Pt-Co alloys" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2010):57-57,
https://hdl.handle.net/21.15107/rcub_cer_3536 .

TY  - CONF
AU  - Obradović, Maja
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3537
AB  - Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1  - Oxidation of formic acid on bulk and nanosized Pt-Co alloys
SP  - 112
EP  - 115
UR  - https://hdl.handle.net/21.15107/rcub_cer_3537
ER  - 

@conference{
author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.",
year = "2010",
abstract = "Bulk Pt3Co and nanosized Pt3Co and PtCo alloys supported on XC-72 high area carbon were investigated as the electrocatalysts for the oxidation of formic acid. Cyclic voltammetry in 0.1 M HClO4 and stripping voltammetry of COads in the same electrolyte show a small difference in the potentials of Pt-oxide formation and reduction and COads oxidation. Based on these results, we concluded that electronic modification of Pt by Co atoms, which was theoretically predicted and experimentally proved on solid/gas interface, is exhibited in the electrochemical environment. Promotion of HCOOH oxidation rate on bimetallic Pt-Co surfaces with respect to pure Pt was found to be up to factor of eight in the case of PtCo/XC-72 catalyst. This moderate increase of the reaction rate is ascribed mostly to the ensemble effect, because partial leaching of Co increased Pt:Co ratio at the bimetallic surfaces, diminishing the efficiency of the ensemble effect.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "Oxidation of formic acid on bulk and nanosized Pt-Co alloys",
pages = "112-115",
url = "https://hdl.handle.net/21.15107/rcub_cer_3537"
}

Obradović, M., Tripković, A.,& Gojković, S. Lj.. (2010). Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 112-115.
https://hdl.handle.net/21.15107/rcub_cer_3537

Obradović M, Tripković A, Gojković SL. Oxidation of formic acid on bulk and nanosized Pt-Co alloys. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:112-115.
https://hdl.handle.net/21.15107/rcub_cer_3537 .

Obradović, Maja, Tripković, Amalija, Gojković, Snežana Lj., "Oxidation of formic acid on bulk and nanosized Pt-Co alloys" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):112-115,
https://hdl.handle.net/21.15107/rcub_cer_3537 .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Lović, Jelena
AU  - Popović, Ksenija
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/685
AB  - The activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (≈25%) and RuUPD (≈40%) in the oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD analysis. To establish the activity and stability of the catalysts, potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD-or RuUPD-modified Pt/C catalysts. The electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts were less active than the corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD-modified Pt/C than between Pt3Ru2/C and RuUPD-modified Pt/C is caused by the electronic effect in Pt3Sn/C. The high activity of Pt3Sn/C modified with a small amount of SnUPD (≈10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of the SnUPD, with an enhanced amount of oxygen- containing species on the Sn sites, resulting finally in a reinforcement of the bifunctional mechanism.
AB  - Aktivnost dve legure, Pt3Sn/C i Pt3Ru2/C, upoređene su sa aktivnostima Pt/C modifikovanim odgovarajućim količinama SnUPD (≈ 25%) ili RuUPD (≈ 40%) u reakciji oksidacije etanola. Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i određen je stepen legiranja. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, kvazi-stacionarnim i hronoamperometrijskim merenjima. Dobijeni rezultati su pokazali da su obe legure aktivnije od SnUPD i RuUPD modifikovanog Pt/C katalizatora. Aktivnost Pt3Sn/C katalizatora određena je značajnim elektronskim efektom, što je i glavni razlog njegove veće aktivnosti u odnosu na Pt3Ru2/C. Odsustvo elektronskog efekta kod SnUPD i RuUPD modifikovanog Pt/C katalizatora čini ove elektrode manje aktivnim od odgovarajućih legura, tj. od Pt3Sn/C i Pt3Ru2/C. Veća razlika u aktivnosti između Pt3Sn/C i SnUPD modifikovanog Pt/C katalizatora nego između Pt3Ru2/C i RuUPD modifikovanog Pt/C katalizatora izazvana je elektronskim efektom u Pt3Sn/C katalizatoru. Velika aktivnost Pt3Sn/C katalizatora modifikovanog malom količinom SnUPD (≈ 10 %) može se objasniti kombinacijom elektronskog efekta, tj. slabijom vezom adsorbata na Pt mestima i većom mobilnošću SnUPD, i povećanom količinom OHad čestica na Sn mestima, što kao krajnji rezultat ima poboljšanje bifunkcionalnog mehanizma reakcije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles
T1  - Uporedno ispitivanje oksidacije etanola na platinskim nanolegurama i Pt nanočesticama modifikovanim podpotencijalnom depozicijom
VL  - 75
IS  - 11
SP  - 1559
EP  - 1574
DO  - 10.2298/JSC100519093T
ER  - 

@article{
author = "Tripković, Amalija and Lović, Jelena and Popović, Ksenija",
year = "2010",
abstract = "The activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (≈25%) and RuUPD (≈40%) in the oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD analysis. To establish the activity and stability of the catalysts, potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD-or RuUPD-modified Pt/C catalysts. The electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts were less active than the corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD-modified Pt/C than between Pt3Ru2/C and RuUPD-modified Pt/C is caused by the electronic effect in Pt3Sn/C. The high activity of Pt3Sn/C modified with a small amount of SnUPD (≈10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of the SnUPD, with an enhanced amount of oxygen- containing species on the Sn sites, resulting finally in a reinforcement of the bifunctional mechanism., Aktivnost dve legure, Pt3Sn/C i Pt3Ru2/C, upoređene su sa aktivnostima Pt/C modifikovanim odgovarajućim količinama SnUPD (≈ 25%) ili RuUPD (≈ 40%) u reakciji oksidacije etanola. Katalizatori su okarakterisani difrakcijom X-zraka (XRD) i određen je stepen legiranja. Njihova aktivnost i stabilnost ispitivana je potenciodinamičkim, kvazi-stacionarnim i hronoamperometrijskim merenjima. Dobijeni rezultati su pokazali da su obe legure aktivnije od SnUPD i RuUPD modifikovanog Pt/C katalizatora. Aktivnost Pt3Sn/C katalizatora određena je značajnim elektronskim efektom, što je i glavni razlog njegove veće aktivnosti u odnosu na Pt3Ru2/C. Odsustvo elektronskog efekta kod SnUPD i RuUPD modifikovanog Pt/C katalizatora čini ove elektrode manje aktivnim od odgovarajućih legura, tj. od Pt3Sn/C i Pt3Ru2/C. Veća razlika u aktivnosti između Pt3Sn/C i SnUPD modifikovanog Pt/C katalizatora nego između Pt3Ru2/C i RuUPD modifikovanog Pt/C katalizatora izazvana je elektronskim efektom u Pt3Sn/C katalizatoru. Velika aktivnost Pt3Sn/C katalizatora modifikovanog malom količinom SnUPD (≈ 10 %) može se objasniti kombinacijom elektronskog efekta, tj. slabijom vezom adsorbata na Pt mestima i većom mobilnošću SnUPD, i povećanom količinom OHad čestica na Sn mestima, što kao krajnji rezultat ima poboljšanje bifunkcionalnog mehanizma reakcije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles, Uporedno ispitivanje oksidacije etanola na platinskim nanolegurama i Pt nanočesticama modifikovanim podpotencijalnom depozicijom",
volume = "75",
number = "11",
pages = "1559-1574",
doi = "10.2298/JSC100519093T"
}

Tripković, A., Lović, J.,& Popović, K.. (2010). Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 75(11), 1559-1574.
https://doi.org/10.2298/JSC100519093T

Tripković A, Lović J, Popović K. Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles. in Journal of the Serbian Chemical Society. 2010;75(11):1559-1574.
doi:10.2298/JSC100519093T .

Tripković, Amalija, Lović, Jelena, Popović, Ksenija, "Comparative study of ethanol oxidation at Pt-based nanoalloys and UPD-modified pt nanoparticles" in Journal of the Serbian Chemical Society, 75, no. 11 (2010):1559-1574,
https://doi.org/10.2298/JSC100519093T . .

TY  - CONF
AU  - Lović, Jelena
AU  - Popović, Ksenija
AU  - Tripković, Amalija
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3524
AB  - Oxidation of ethanol was studied at SnUPD, RuUPD and RhUPD modified and unmodified Pt/C, Pt3Sn/C and Pt3Ru2/C catalysts. All unmodified catalysts were characterized by XRD. Potentiodynamic and chronoamperometric measurements were used to establish their catalytic activity for ethanol oxidation. Underpotential deposition of small amount of each one adatoms (~10%) enhanced the activity of Pt/C and Pt3Sn/C catalysts. The onset potential is shifted for ~0.05 V towards lower values and the current densities in the whole potential region studied are up to two times higher regarding to unmodified catalysts. On the other hand, addition of SnUPD or RhUPD slightly increases the activity of Pt3Ru2/C, while the presence of Ruad adlayer decreases its activity for ethanol oxidation. Catalytic action of Sn and Ru adatoms was associated mostly with their ability to adsorb oxygen containing species at lower potentials than Pt, permitting bifunctional mechanism to proceed. Rh adatoms act on the C-C bond breaking activation increasing in this way the activity of modified surfaces for the ethanol oxidation. Pt3Sn/C modified by ~10% SnUPD is the best catalyst studied. Its activity enhanced more than two times in respect to Pt3Sn/C catalyst.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Effects of UPD adlayer of foreign metals on the oxidation of ethanol on carbon supported Pt-based catalysts
SP  - 61
EP  - 61
UR  - https://hdl.handle.net/21.15107/rcub_cer_3524
ER  - 

@conference{
author = "Lović, Jelena and Popović, Ksenija and Tripković, Amalija",
year = "2010",
abstract = "Oxidation of ethanol was studied at SnUPD, RuUPD and RhUPD modified and unmodified Pt/C, Pt3Sn/C and Pt3Ru2/C catalysts. All unmodified catalysts were characterized by XRD. Potentiodynamic and chronoamperometric measurements were used to establish their catalytic activity for ethanol oxidation. Underpotential deposition of small amount of each one adatoms (~10%) enhanced the activity of Pt/C and Pt3Sn/C catalysts. The onset potential is shifted for ~0.05 V towards lower values and the current densities in the whole potential region studied are up to two times higher regarding to unmodified catalysts. On the other hand, addition of SnUPD or RhUPD slightly increases the activity of Pt3Ru2/C, while the presence of Ruad adlayer decreases its activity for ethanol oxidation. Catalytic action of Sn and Ru adatoms was associated mostly with their ability to adsorb oxygen containing species at lower potentials than Pt, permitting bifunctional mechanism to proceed. Rh adatoms act on the C-C bond breaking activation increasing in this way the activity of modified surfaces for the ethanol oxidation. Pt3Sn/C modified by ~10% SnUPD is the best catalyst studied. Its activity enhanced more than two times in respect to Pt3Sn/C catalyst.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Effects of UPD adlayer of foreign metals on the oxidation of ethanol on carbon supported Pt-based catalysts",
pages = "61-61",
url = "https://hdl.handle.net/21.15107/rcub_cer_3524"
}

Lović, J., Popović, K.,& Tripković, A.. (2010). Effects of UPD adlayer of foreign metals on the oxidation of ethanol on carbon supported Pt-based catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Serbian Chemical Society, Belgrade., 61-61.
https://hdl.handle.net/21.15107/rcub_cer_3524

Lović J, Popović K, Tripković A. Effects of UPD adlayer of foreign metals on the oxidation of ethanol on carbon supported Pt-based catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2010;:61-61.
https://hdl.handle.net/21.15107/rcub_cer_3524 .

Lović, Jelena, Popović, Ksenija, Tripković, Amalija, "Effects of UPD adlayer of foreign metals on the oxidation of ethanol on carbon supported Pt-based catalysts" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2010):61-61,
https://hdl.handle.net/21.15107/rcub_cer_3524 .

TY  - CONF
AU  - Tripković, Amalija
AU  - Lović, Jelena
AU  - Popović, Ksenija
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3532
AB  - Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts
SP  - 139
EP  - 139
UR  - https://hdl.handle.net/21.15107/rcub_cer_3532
ER  - 

@conference{
author = "Tripković, Amalija and Lović, Jelena and Popović, Ksenija",
year = "2010",
abstract = "Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts",
pages = "139-139",
url = "https://hdl.handle.net/21.15107/rcub_cer_3532"
}

Tripković, A., Lović, J.,& Popović, K.. (2010). Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Serbian Chemical Society, Belgrade., 139-139.
https://hdl.handle.net/21.15107/rcub_cer_3532

Tripković A, Lović J, Popović K. Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2010;:139-139.
https://hdl.handle.net/21.15107/rcub_cer_3532 .

Tripković, Amalija, Lović, Jelena, Popović, Ksenija, "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2010):139-139,
https://hdl.handle.net/21.15107/rcub_cer_3532 .

TY  - CONF
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Popović, Ksenija
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3533
AB  - Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1  - Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts
SP  - 207
EP  - 210
UR  - https://hdl.handle.net/21.15107/rcub_cer_3533
ER  - 

@conference{
author = "Lović, Jelena and Tripković, Amalija and Popović, Ksenija",
year = "2010",
abstract = "Activity of two alloys, Pt3Sn/C and Pt3Ru2/C, was compared with the activity of Pt/C modified with corresponding amounts of SnUPD (~25 %) and RuUPD (~40 %) in overall oxidation of ethanol. Pt3Sn/C, Pt3Ru2/C and Pt/C catalysts were characterized by XRD. To establish the activity and stability of the catalysts potentiodynamic, quasi steady-state and chronoamperometric measurements were performed. Both alloys are more active than SnUPD or RuUPD modified Pt/C catalysts. Electronic effect determining dominantly the activity of Pt3Sn/C is the main reason for its higher activity compared to Pt3Ru2/C. Since SnUPD and RuUPD do not provoke any significant modification of electronic environment, both modified Pt/C catalysts are less active than corresponding alloys. More pronounced difference in activity between Pt3Sn/C and SnUPD modified Pt/C than between Pt3Ru2/C and RuUPD modified Pt/C is caused by electronic effect in Pt3Sn/C. High activity of Pt3Sn/C modified with small amount of SnUPD (~10%) can be explained by combining the electronic effect, causing less strongly bonded adsorbate on Pt sites and easier mobility of SnUPD, with enhanced amount of oxygen-containing species on Sn sites resulting finally in reinforcement of bifunctional mechanism.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts",
pages = "207-210",
url = "https://hdl.handle.net/21.15107/rcub_cer_3533"
}

Lović, J., Tripković, A.,& Popović, K.. (2010). Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 207-210.
https://hdl.handle.net/21.15107/rcub_cer_3533

Lović J, Tripković A, Popović K. Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:207-210.
https://hdl.handle.net/21.15107/rcub_cer_3533 .

Lović, Jelena, Tripković, Amalija, Popović, Ksenija, "Ethanol oxidation at Pt-based alloys and UPD modified Pt/C catalysts" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):207-210,
https://hdl.handle.net/21.15107/rcub_cer_3533 .

TY  - JOUR
AU  - Obradović, Maja
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/622
AB  - We have investigated the oxidation of HCOOH on Au-modified Pt (Au"Pt) and Pt-modified Au (Pt"Au) electrodes to establish the role of the ensemble and the electronic effect in the catalysis of this reaction. The surfaces were modified by the electrodeposition of sub-monolayers. Cyclic voltammetry in the supporting electrolyte and COads stripping have shown that the electronic Pt-Au interactions are insignificant on Au"Pt, but considerable on Pt"Au. Oxidation of COads on Au"Pt commenced at the same potentials as on bare Pt, whereas on Pt"Au the oxidation was delayed for ∼0.2 V. Both types of Pt-Au surfaces were found to be more active toward the oxidation of HCOOH compared to bare Pt, exhibiting the maximum activity at Pt fraction between 0.15 and 0.25 with the enhancement factor of more than two orders of magnitude. On bimetallic surfaces the amount of COads formed by HCOOH dehydration was low and decreased with decreasing Pt fraction. It was concluded that the high activity of Pt-Au surfaces is caused by the increased selectivity toward the HCOOH dehydrogenation. Similar behavior of Pt-Au surfaces in the HCOOH oxidation, regardless on the Pt-Au electronic interactions, leads to the conclusion that the ensemble effect plays dominant role in the catalysis of HCOOH oxidation.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Electrochimica Acta
T1  - The origin of high activity of Pt-Au surfaces in the formic acid oxidation
VL  - 55
IS  - 1
SP  - 204
EP  - 209
DO  - 10.1016/j.electacta.2009.08.038
ER  - 

@article{
author = "Obradović, Maja and Tripković, Amalija and Gojković, Snežana Lj.",
year = "2009",
abstract = "We have investigated the oxidation of HCOOH on Au-modified Pt (Au"Pt) and Pt-modified Au (Pt"Au) electrodes to establish the role of the ensemble and the electronic effect in the catalysis of this reaction. The surfaces were modified by the electrodeposition of sub-monolayers. Cyclic voltammetry in the supporting electrolyte and COads stripping have shown that the electronic Pt-Au interactions are insignificant on Au"Pt, but considerable on Pt"Au. Oxidation of COads on Au"Pt commenced at the same potentials as on bare Pt, whereas on Pt"Au the oxidation was delayed for ∼0.2 V. Both types of Pt-Au surfaces were found to be more active toward the oxidation of HCOOH compared to bare Pt, exhibiting the maximum activity at Pt fraction between 0.15 and 0.25 with the enhancement factor of more than two orders of magnitude. On bimetallic surfaces the amount of COads formed by HCOOH dehydration was low and decreased with decreasing Pt fraction. It was concluded that the high activity of Pt-Au surfaces is caused by the increased selectivity toward the HCOOH dehydrogenation. Similar behavior of Pt-Au surfaces in the HCOOH oxidation, regardless on the Pt-Au electronic interactions, leads to the conclusion that the ensemble effect plays dominant role in the catalysis of HCOOH oxidation.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Electrochimica Acta",
title = "The origin of high activity of Pt-Au surfaces in the formic acid oxidation",
volume = "55",
number = "1",
pages = "204-209",
doi = "10.1016/j.electacta.2009.08.038"
}

Obradović, M., Tripković, A.,& Gojković, S. Lj.. (2009). The origin of high activity of Pt-Au surfaces in the formic acid oxidation. in Electrochimica Acta
Oxford : Pergamon-Elsevier Science Ltd., 55(1), 204-209.
https://doi.org/10.1016/j.electacta.2009.08.038

Obradović M, Tripković A, Gojković SL. The origin of high activity of Pt-Au surfaces in the formic acid oxidation. in Electrochimica Acta. 2009;55(1):204-209.
doi:10.1016/j.electacta.2009.08.038 .

Obradović, Maja, Tripković, Amalija, Gojković, Snežana Lj., "The origin of high activity of Pt-Au surfaces in the formic acid oxidation" in Electrochimica Acta, 55, no. 1 (2009):204-209,
https://doi.org/10.1016/j.electacta.2009.08.038 . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Jovanović, Vladislava M.
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Kowal, Andrzej
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/532
AB  - Oxidation of ethanol was studied at Sn-ad modified and unmodified Pt3Sn/C and Pt/C catalysts. Pt3Sn/C and Pt/C catalysts were characterized by XRD. Potentiodynamic and chronoamperometric measurements were used to establish catalytic activity and stability. High activity achieved at Sn-ad modified Pt3Sn/C catalyst has not been observed at any bimetallic catalyst so far. Promotional effect of Sn-ad on the ethanol oxidation was related to the enhancement of CO oxidation rate in bifunctional mechanism. It was shown that electrodeposited Sn exhibited different effect on the catalytic activity compared to Sn in alloy.
PB  - Elsevier Science Inc, New York
T2  - Electrochemistry Communications
T1  - Promotional effect of Sn-ad on the ethanol oxidation at Pt3Sn/C catalyst
VL  - 11
IS  - 5
SP  - 1030
EP  - 1033
DO  - 10.1016/j.elecom.2009.03.004
ER  - 

@article{
author = "Tripković, Amalija and Popović, Ksenija and Lović, Jelena and Jovanović, Vladislava M. and Stevanović, Sanja and Tripković, Dušan and Kowal, Andrzej",
year = "2009",
abstract = "Oxidation of ethanol was studied at Sn-ad modified and unmodified Pt3Sn/C and Pt/C catalysts. Pt3Sn/C and Pt/C catalysts were characterized by XRD. Potentiodynamic and chronoamperometric measurements were used to establish catalytic activity and stability. High activity achieved at Sn-ad modified Pt3Sn/C catalyst has not been observed at any bimetallic catalyst so far. Promotional effect of Sn-ad on the ethanol oxidation was related to the enhancement of CO oxidation rate in bifunctional mechanism. It was shown that electrodeposited Sn exhibited different effect on the catalytic activity compared to Sn in alloy.",
publisher = "Elsevier Science Inc, New York",
journal = "Electrochemistry Communications",
title = "Promotional effect of Sn-ad on the ethanol oxidation at Pt3Sn/C catalyst",
volume = "11",
number = "5",
pages = "1030-1033",
doi = "10.1016/j.elecom.2009.03.004"
}

Tripković, A., Popović, K., Lović, J., Jovanović, V. M., Stevanović, S., Tripković, D.,& Kowal, A.. (2009). Promotional effect of Sn-ad on the ethanol oxidation at Pt3Sn/C catalyst. in Electrochemistry Communications
Elsevier Science Inc, New York., 11(5), 1030-1033.
https://doi.org/10.1016/j.elecom.2009.03.004

Tripković A, Popović K, Lović J, Jovanović VM, Stevanović S, Tripković D, Kowal A. Promotional effect of Sn-ad on the ethanol oxidation at Pt3Sn/C catalyst. in Electrochemistry Communications. 2009;11(5):1030-1033.
doi:10.1016/j.elecom.2009.03.004 .

Tripković, Amalija, Popović, Ksenija, Lović, Jelena, Jovanović, Vladislava M., Stevanović, Sanja, Tripković, Dušan, Kowal, Andrzej, "Promotional effect of Sn-ad on the ethanol oxidation at Pt3Sn/C catalyst" in Electrochemistry Communications, 11, no. 5 (2009):1030-1033,
https://doi.org/10.1016/j.elecom.2009.03.004 . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Babić-Samardžija, Ksenija
AU  - Sovilj, Sofija P.
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/553
AB  - Platinum electrode decorated with three different mixed-ligand cobalt(III) complexes of the general formula [Co(Rdtc)cyclam](ClO4)(2) [cyclam = 1,4,8,11-tetraazacyclotetradecane, Rdtc(-) = morpholine-(Morphdtc), piperidine-(Pipdtc), and 4-methylpiperidine-(4-Mepipdtc) dithiocarbamates, respectively] was used to study oxidation of formic acid in acidic solution. The complexes were adsorbed on differently prepared Pt surfaces, at open circuit potential. The preliminary results show increased catalytic activity of Pt for formic acid oxidation with complex ion adsorbed on the polycrystalline surfaces. The increase in catalytic activity depends on the structure of the complex applied and follows the order of metal-coordinated bidentate ligand as Morphdtc > Pipdtc > 4-Mepipdtc. Based on IR and NMR data, the main characteristics of the Rdtc ligands do not vary dramatically, but high symmetry of the corresponding complexes decreases in the same order. Accordingly, the complexes are distinctively more mobile, causing chemical interactions to occur on the surface with appreciable speed and enhanced selectivity. The effect of the complexes on catalytic activity presumably depends on structural changes on Pt surfaces caused by their adsorption.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes
VL  - 83
IS  - 9
SP  - 1442
EP  - 1446
DO  - 10.1134/S0036024409090040
ER  - 

@article{
author = "Stevanović, Sanja and Babić-Samardžija, Ksenija and Sovilj, Sofija P. and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2009",
abstract = "Platinum electrode decorated with three different mixed-ligand cobalt(III) complexes of the general formula [Co(Rdtc)cyclam](ClO4)(2) [cyclam = 1,4,8,11-tetraazacyclotetradecane, Rdtc(-) = morpholine-(Morphdtc), piperidine-(Pipdtc), and 4-methylpiperidine-(4-Mepipdtc) dithiocarbamates, respectively] was used to study oxidation of formic acid in acidic solution. The complexes were adsorbed on differently prepared Pt surfaces, at open circuit potential. The preliminary results show increased catalytic activity of Pt for formic acid oxidation with complex ion adsorbed on the polycrystalline surfaces. The increase in catalytic activity depends on the structure of the complex applied and follows the order of metal-coordinated bidentate ligand as Morphdtc > Pipdtc > 4-Mepipdtc. Based on IR and NMR data, the main characteristics of the Rdtc ligands do not vary dramatically, but high symmetry of the corresponding complexes decreases in the same order. Accordingly, the complexes are distinctively more mobile, causing chemical interactions to occur on the surface with appreciable speed and enhanced selectivity. The effect of the complexes on catalytic activity presumably depends on structural changes on Pt surfaces caused by their adsorption.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes",
volume = "83",
number = "9",
pages = "1442-1446",
doi = "10.1134/S0036024409090040"
}

Stevanović, S., Babić-Samardžija, K., Sovilj, S. P., Tripković, A.,& Jovanović, V. M.. (2009). Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 83(9), 1442-1446.
https://doi.org/10.1134/S0036024409090040

Stevanović S, Babić-Samardžija K, Sovilj SP, Tripković A, Jovanović VM. Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes. in Russian Journal of Physical Chemistry A. 2009;83(9):1442-1446.
doi:10.1134/S0036024409090040 .

Stevanović, Sanja, Babić-Samardžija, Ksenija, Sovilj, Sofija P., Tripković, Amalija, Jovanović, Vladislava M., "Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes" in Russian Journal of Physical Chemistry A, 83, no. 9 (2009):1442-1446,
https://doi.org/10.1134/S0036024409090040 . .

TY  - JOUR
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Olszewski, Piotr K.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/513
AB  - The electrocatalytic activity of Pt3Ru2/C nanocatalyst toward the electro-oxidation of bulk CO was examined in acid and alkaline solution at ambient temperature using the thin-film, rotating disk electrode (RDE) method. The catalyst was characterized by XRD analysis. The XRD pattern revealed that the Pt3Ru2/C catalyst consisted of two structures, i.e., Pt-Ru-fcc and Ruhcp (a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru). Electrocatalytic activities were measured by applying potentiodynamic and steady state techniques. The oxidation of CO on the Pt3Ru2/C catalyst was influenced by pH and anions from the supporting electrolytes. The Pt3Ru2/C was more active in alkaline than in acid solution, as well as in perchloric than in sulfuric acid. Comparison of CO oxidation on Pt3Ru2/C and Pt/C revealed that the Pt3Ru2/C was more active than Pt/C in acid solution, while both catalysts had a similar activity in alkaline solution.
AB  - Elektrohemijska oksidacija CO ispitivana je na nanokatalizatoru Pt3Ru2 dispergovanom na aktivnom uglju kao nosaču u kiseloj i alkalnoj sredini na sobnoj temperaturi korišćenjem metode rotirajuće disk elektrode (RDE). Katalizator je okarakterisan difrakcijom X-zraka (XRD) i dobijeni rezultati su pokazali da se legura Pt3Ru2 sastoji od dve faze: čvrstog rastvora Ru u Pt i od malih količina čistog Ru ili čvrstog rastvora Pt u Ru. Elektrokatalitička aktivnost ovog katalizatora za oksidaciju CO je ispitivana cik- ličnom voltametrijom i pokazan je efekat pH i efekat anjona iz nosećeg elektrolita. Pt3Ru2/C katalizator je aktivniji u alkalnoj nego u kiseloj sredini, ukazujući na činjenicu da u alkaliji Pt može da adsorbuje OH čestice na isto tako niskim potencijalima kao i Ru i na taj način ubrzava reakciju oksidacije CO u poređenju sa kiselinom. Pokazano je da adsorpcija bisulfatnih anjona iz nosećeg elektrolita pomera početni potencijal reakcije ka pozitivnijim vrednostima i smanjuje brzinu oksidacije CO. Poređenjem aktivnosti Pt/C i Pt3Ru2/C katalizatora u oksidaciji CO u kiseloj i alkalnij sredini pokazano je da je ta razlika znatno manja u alkalnoj nego u kiseloj sredini.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation
T1  - Aktivnost Pt3Ru2/C nanokatalizatora u oksidaciji CO
VL  - 74
IS  - 8-9
SP  - 965
EP  - 975
DO  - 10.2298/JSC0909965P
ER  - 

@article{
author = "Popović, Ksenija and Lović, Jelena and Tripković, Amalija and Olszewski, Piotr K.",
year = "2009",
abstract = "The electrocatalytic activity of Pt3Ru2/C nanocatalyst toward the electro-oxidation of bulk CO was examined in acid and alkaline solution at ambient temperature using the thin-film, rotating disk electrode (RDE) method. The catalyst was characterized by XRD analysis. The XRD pattern revealed that the Pt3Ru2/C catalyst consisted of two structures, i.e., Pt-Ru-fcc and Ruhcp (a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru). Electrocatalytic activities were measured by applying potentiodynamic and steady state techniques. The oxidation of CO on the Pt3Ru2/C catalyst was influenced by pH and anions from the supporting electrolytes. The Pt3Ru2/C was more active in alkaline than in acid solution, as well as in perchloric than in sulfuric acid. Comparison of CO oxidation on Pt3Ru2/C and Pt/C revealed that the Pt3Ru2/C was more active than Pt/C in acid solution, while both catalysts had a similar activity in alkaline solution., Elektrohemijska oksidacija CO ispitivana je na nanokatalizatoru Pt3Ru2 dispergovanom na aktivnom uglju kao nosaču u kiseloj i alkalnoj sredini na sobnoj temperaturi korišćenjem metode rotirajuće disk elektrode (RDE). Katalizator je okarakterisan difrakcijom X-zraka (XRD) i dobijeni rezultati su pokazali da se legura Pt3Ru2 sastoji od dve faze: čvrstog rastvora Ru u Pt i od malih količina čistog Ru ili čvrstog rastvora Pt u Ru. Elektrokatalitička aktivnost ovog katalizatora za oksidaciju CO je ispitivana cik- ličnom voltametrijom i pokazan je efekat pH i efekat anjona iz nosećeg elektrolita. Pt3Ru2/C katalizator je aktivniji u alkalnoj nego u kiseloj sredini, ukazujući na činjenicu da u alkaliji Pt može da adsorbuje OH čestice na isto tako niskim potencijalima kao i Ru i na taj način ubrzava reakciju oksidacije CO u poređenju sa kiselinom. Pokazano je da adsorpcija bisulfatnih anjona iz nosećeg elektrolita pomera početni potencijal reakcije ka pozitivnijim vrednostima i smanjuje brzinu oksidacije CO. Poređenjem aktivnosti Pt/C i Pt3Ru2/C katalizatora u oksidaciji CO u kiseloj i alkalnij sredini pokazano je da je ta razlika znatno manja u alkalnoj nego u kiseloj sredini.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation, Aktivnost Pt3Ru2/C nanokatalizatora u oksidaciji CO",
volume = "74",
number = "8-9",
pages = "965-975",
doi = "10.2298/JSC0909965P"
}

Popović, K., Lović, J., Tripković, A.,& Olszewski, P. K.. (2009). Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 74(8-9), 965-975.
https://doi.org/10.2298/JSC0909965P

Popović K, Lović J, Tripković A, Olszewski PK. Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation. in Journal of the Serbian Chemical Society. 2009;74(8-9):965-975.
doi:10.2298/JSC0909965P .

Popović, Ksenija, Lović, Jelena, Tripković, Amalija, Olszewski, Piotr K., "Activity of carbon supported Pt3Ru2 nanocatalyst in CO oxidation" in Journal of the Serbian Chemical Society, 74, no. 8-9 (2009):965-975,
https://doi.org/10.2298/JSC0909965P . .

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Tripković, Dušan
AU  - Kowal, Andrzej
AU  - Minic, D.
AU  - Jovanović, Vladislava M.
AU  - Tripković, Amalija
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/379
AB  - Platinum supported on glassy carbon (GC) was used as a model system for studying the influence of the surface morphology of a Pt catalyst on methanol oxidation in alkaline and acidic solutions. Platinum was deposited by the potential step method on GC samples from H2SO4 + H2PtCl6 solution under the same conditions with loadings from 10 to 80 mg cm-2. AFM and STM images of the GC/Pt electrodes showed that the Pt was deposited in the form of 3D agglomerates composed of spherical particles. Longer deposition times resulted in increased growth of Pt forms and a decrease in the specific area of the Pt. The real surface area of Pt increased with loading but the changes were almost negligible at higher loadings. Nevertheless, both the specific and mass activity of platinum supported on glassy carbon for methanol oxidation in acidic and in alkaline solutions exhibit a volcanic dependence with respect to the platinum loading. The increase in the activity can be explained by the increasing the particle size with the loading and thus an increase in the contiguous Pt sites available for adsorption and decomposition of methanol. However, the decrease in the activity of the catalyst with further increase of loading and particle size after reaching the maximum is related to the decrease of active sites available for methanol adsorption and their accessibility as a result of more close proximity and pronounced coalescence of the Pt particles.
AB  - Platina istaložena na staklasti ugljenik (GC) korišćena je kao model sistem za ispitivanje uticaja morfologije površine Pt katalizatora za reakciju oksidacije metanola u alkalnim i kiselim rastvorima. Platina je taložena potenciostatskom pulsnom metodom na GC podlogu iz H2SO4 + H2PtCl6 rastvora pod istim uslovima u količini od 10 to 80 mg cm-2. AFM i STM slike GC/Pt elektroda pokazuju da je Pt istaložena u obliku 3D aglomerata koji se sastoje od sfernih čestica. Duže vreme taloženja dovodi do povećanog rasta Pt formi i smanjenja specifične površine nataložene platine. Realna površina istaložene platine raste sa povećanjem količine istaložene platine dostižući plato. Bez obzira na ovo, specifična i masena aktivnost platine istaložene na staklasti ugljenik za oksidaciju metanola kako u kiselim tako i u alkalnim rastvorima pokazuje vulkansku zavisnost od količine istaložene platine. Povećanje aktivnosti se može objasniti preko povećanja veličine čestica sa količinom istaložene platine, odnosno preko povećanja susednih Pt mesta dostupnih za adsorbciju i dekompoziciju metanola. Međutim, smanjenje katalitičke aktivnosti sa daljim povećanjem količine istaložene platine i veličine njenih čestica nakon postignutog maksimuma je povezano sa smanjenjem broja aktivnih mesta dostupnih za adsorpciju metanola i rezultat je smanjenja rastojanja i izraženog stapanja Pt čestica.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Influence of surface morphology on methanol oxidation at a glassy carbon-supported Pt catalyst
T1  - Uticaj površinske morfologije na oksidaciju metanola na platinskim katalizatorima sa podlogom od staklastog ugljenika
VL  - 73
IS  - 8-9
SP  - 845
EP  - 859
DO  - 10.2298/JSC0809845S
ER  - 

@article{
author = "Stevanović, Sanja and Tripković, Dušan and Kowal, Andrzej and Minic, D. and Jovanović, Vladislava M. and Tripković, Amalija",
year = "2008",
abstract = "Platinum supported on glassy carbon (GC) was used as a model system for studying the influence of the surface morphology of a Pt catalyst on methanol oxidation in alkaline and acidic solutions. Platinum was deposited by the potential step method on GC samples from H2SO4 + H2PtCl6 solution under the same conditions with loadings from 10 to 80 mg cm-2. AFM and STM images of the GC/Pt electrodes showed that the Pt was deposited in the form of 3D agglomerates composed of spherical particles. Longer deposition times resulted in increased growth of Pt forms and a decrease in the specific area of the Pt. The real surface area of Pt increased with loading but the changes were almost negligible at higher loadings. Nevertheless, both the specific and mass activity of platinum supported on glassy carbon for methanol oxidation in acidic and in alkaline solutions exhibit a volcanic dependence with respect to the platinum loading. The increase in the activity can be explained by the increasing the particle size with the loading and thus an increase in the contiguous Pt sites available for adsorption and decomposition of methanol. However, the decrease in the activity of the catalyst with further increase of loading and particle size after reaching the maximum is related to the decrease of active sites available for methanol adsorption and their accessibility as a result of more close proximity and pronounced coalescence of the Pt particles., Platina istaložena na staklasti ugljenik (GC) korišćena je kao model sistem za ispitivanje uticaja morfologije površine Pt katalizatora za reakciju oksidacije metanola u alkalnim i kiselim rastvorima. Platina je taložena potenciostatskom pulsnom metodom na GC podlogu iz H2SO4 + H2PtCl6 rastvora pod istim uslovima u količini od 10 to 80 mg cm-2. AFM i STM slike GC/Pt elektroda pokazuju da je Pt istaložena u obliku 3D aglomerata koji se sastoje od sfernih čestica. Duže vreme taloženja dovodi do povećanog rasta Pt formi i smanjenja specifične površine nataložene platine. Realna površina istaložene platine raste sa povećanjem količine istaložene platine dostižući plato. Bez obzira na ovo, specifična i masena aktivnost platine istaložene na staklasti ugljenik za oksidaciju metanola kako u kiselim tako i u alkalnim rastvorima pokazuje vulkansku zavisnost od količine istaložene platine. Povećanje aktivnosti se može objasniti preko povećanja veličine čestica sa količinom istaložene platine, odnosno preko povećanja susednih Pt mesta dostupnih za adsorbciju i dekompoziciju metanola. Međutim, smanjenje katalitičke aktivnosti sa daljim povećanjem količine istaložene platine i veličine njenih čestica nakon postignutog maksimuma je povezano sa smanjenjem broja aktivnih mesta dostupnih za adsorpciju metanola i rezultat je smanjenja rastojanja i izraženog stapanja Pt čestica.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of surface morphology on methanol oxidation at a glassy carbon-supported Pt catalyst, Uticaj površinske morfologije na oksidaciju metanola na platinskim katalizatorima sa podlogom od staklastog ugljenika",
volume = "73",
number = "8-9",
pages = "845-859",
doi = "10.2298/JSC0809845S"
}

Stevanović, S., Tripković, D., Kowal, A., Minic, D., Jovanović, V. M.,& Tripković, A.. (2008). Influence of surface morphology on methanol oxidation at a glassy carbon-supported Pt catalyst. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(8-9), 845-859.
https://doi.org/10.2298/JSC0809845S

Stevanović S, Tripković D, Kowal A, Minic D, Jovanović VM, Tripković A. Influence of surface morphology on methanol oxidation at a glassy carbon-supported Pt catalyst. in Journal of the Serbian Chemical Society. 2008;73(8-9):845-859.
doi:10.2298/JSC0809845S .

Stevanović, Sanja, Tripković, Dušan, Kowal, Andrzej, Minic, D., Jovanović, Vladislava M., Tripković, Amalija, "Influence of surface morphology on methanol oxidation at a glassy carbon-supported Pt catalyst" in Journal of the Serbian Chemical Society, 73, no. 8-9 (2008):845-859,
https://doi.org/10.2298/JSC0809845S . .