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  - Obradović, Maja
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/677
AB  - The results of an investigation of two samples of commercial multi-walled carbon nanotubes and a sample of carbon black, in the raw and activated state, were presented in the lecture. The activation of the carbon materials led to the formation of an abundance of oxygen-containing functional groups on the surface, an increased electrochemically active surface area, an enhanced charge storage ability and a promotion of the electron-transfer kinetics. It was presented that the morphology of the carbon nanotubes is important for the electrochemical properties, because nanotubes with a higher proportion of edge and defect sites showed faster electron transfer and pseudocapacitive redox kinetics. Modification of oxidized nanotubes by ethylenediamine and wrapping by poly(diallyldimethylammonium chloride) led to a decrease in the electrochemically active surface area and to reduced electrontransfer kinetics. Pt nanoparticles prepared by the microwave-assisted polyol method were deposited at the investigated carbon materials. A much higher efficiency of Pt deposition was observed on the modified CNTs than on the activated CNTs. The activity of the synthesized catalyst toward electrochemical oxygen reduction was almost the same as the activity of the commercial Pt/XC-72 catalyst.
AB  - U okviru predavanja su prikazani rezultati ispitivanja dve vrste komercijalnih višeslojnih ugljeničnih nanocevi i uzorka ugljeničnog praha razvijene površine pre i nakon aktivacije hemijskom oksidacijom. Oksidacija uzoraka dovodi do izraženog formiranja kiseoničnih grupa na površini ugljeničnih materijala, povećanja elektrohemijski aktivne površine kao i do ubrzanja prenosa naelektrisanja. Pokazano je da morfologija ugljeničnih nanocevi ima značajan uticaj na njihove elektrohemijske karakteristike. Uzorak sa većim udelom ivica i defekata pokazao je bržu kinetiku prenosa naelektrisanja i veću pseudokapacitivnost. Modifikovanje oksidovanih nanocevi etilendiaminom i polimerom poli(dialildimetilamonijum-hloridom) dovodi do smanjenja aktivne površine i do sporijeg prenosa naelektrisanja. Nanočestice platine, sintetisane u rastvoru etilenglikola u mikrotalasnoj pećnici, nanete su na ispitivane ugljenične materijale. Količina nanete Pt je mnogo veća na modifikovanim nego na oksidovanim nanocevima. Aktivnost sintetisanih uzoraka za elektrohemijsku redukciju kiseonika je upoređena sa aktivnošću komercijalnog katalizatora Pt/XC-72 za istu reakciju i pokazalo se da su njihove specifične aktivnosti približno jednake.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The electrochemical properties of carbon nanotubes and carbon XC-72R and their application as Pt supports
T1  - Elektrohemijske karakteristike ugljeničnih nanocevi i ugljenika XC-72R i njihova primena u sintezi Pt katalizatora
VL  - 75
IS  - 10
SP  - 1435
EP  - 1439
DO  - 10.2298/JSC100520081O
ER  - 

@article{
author = "Obradović, Maja",
year = "2010",
abstract = "The results of an investigation of two samples of commercial multi-walled carbon nanotubes and a sample of carbon black, in the raw and activated state, were presented in the lecture. The activation of the carbon materials led to the formation of an abundance of oxygen-containing functional groups on the surface, an increased electrochemically active surface area, an enhanced charge storage ability and a promotion of the electron-transfer kinetics. It was presented that the morphology of the carbon nanotubes is important for the electrochemical properties, because nanotubes with a higher proportion of edge and defect sites showed faster electron transfer and pseudocapacitive redox kinetics. Modification of oxidized nanotubes by ethylenediamine and wrapping by poly(diallyldimethylammonium chloride) led to a decrease in the electrochemically active surface area and to reduced electrontransfer kinetics. Pt nanoparticles prepared by the microwave-assisted polyol method were deposited at the investigated carbon materials. A much higher efficiency of Pt deposition was observed on the modified CNTs than on the activated CNTs. The activity of the synthesized catalyst toward electrochemical oxygen reduction was almost the same as the activity of the commercial Pt/XC-72 catalyst., U okviru predavanja su prikazani rezultati ispitivanja dve vrste komercijalnih višeslojnih ugljeničnih nanocevi i uzorka ugljeničnog praha razvijene površine pre i nakon aktivacije hemijskom oksidacijom. Oksidacija uzoraka dovodi do izraženog formiranja kiseoničnih grupa na površini ugljeničnih materijala, povećanja elektrohemijski aktivne površine kao i do ubrzanja prenosa naelektrisanja. Pokazano je da morfologija ugljeničnih nanocevi ima značajan uticaj na njihove elektrohemijske karakteristike. Uzorak sa većim udelom ivica i defekata pokazao je bržu kinetiku prenosa naelektrisanja i veću pseudokapacitivnost. Modifikovanje oksidovanih nanocevi etilendiaminom i polimerom poli(dialildimetilamonijum-hloridom) dovodi do smanjenja aktivne površine i do sporijeg prenosa naelektrisanja. Nanočestice platine, sintetisane u rastvoru etilenglikola u mikrotalasnoj pećnici, nanete su na ispitivane ugljenične materijale. Količina nanete Pt je mnogo veća na modifikovanim nego na oksidovanim nanocevima. Aktivnost sintetisanih uzoraka za elektrohemijsku redukciju kiseonika je upoređena sa aktivnošću komercijalnog katalizatora Pt/XC-72 za istu reakciju i pokazalo se da su njihove specifične aktivnosti približno jednake.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The electrochemical properties of carbon nanotubes and carbon XC-72R and their application as Pt supports, Elektrohemijske karakteristike ugljeničnih nanocevi i ugljenika XC-72R i njihova primena u sintezi Pt katalizatora",
volume = "75",
number = "10",
pages = "1435-1439",
doi = "10.2298/JSC100520081O"
}

Obradović, M.. (2010). The electrochemical properties of carbon nanotubes and carbon XC-72R and their application as Pt supports. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 75(10), 1435-1439.
https://doi.org/10.2298/JSC100520081O

Obradović M. The electrochemical properties of carbon nanotubes and carbon XC-72R and their application as Pt supports. in Journal of the Serbian Chemical Society. 2010;75(10):1435-1439.
doi:10.2298/JSC100520081O .

Obradović, Maja, "The electrochemical properties of carbon nanotubes and carbon XC-72R and their application as Pt supports" in Journal of the Serbian Chemical Society, 75, no. 10 (2010):1435-1439,
https://doi.org/10.2298/JSC100520081O . .

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  - JOUR
AU  - Obradović, Maja
AU  - Vuković, G.D.
AU  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Uskoković, Petar S.
AU  - Kowal, Andrzej
AU  - Gojković, Snežana Lj.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/582
AB  - Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe (CN)6 3 - / Fe (CN)6 4 - redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - A comparative study of the electrochemical properties of carbon nanotubes and carbon black
VL  - 634
IS  - 1
SP  - 22
EP  - 30
DO  - 10.1016/j.jelechem.2009.07.001
ER  - 

@article{
author = "Obradović, Maja and Vuković, G.D. and Stevanović, Sanja and Panić, Vladimir and Uskoković, Petar S. and Kowal, Andrzej and Gojković, Snežana Lj.",
year = "2009",
abstract = "Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe (CN)6 3 - / Fe (CN)6 4 - redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "A comparative study of the electrochemical properties of carbon nanotubes and carbon black",
volume = "634",
number = "1",
pages = "22-30",
doi = "10.1016/j.jelechem.2009.07.001"
}

Obradović, M., Vuković, G.D., Stevanović, S., Panić, V., Uskoković, P. S., Kowal, A.,& Gojković, S. Lj.. (2009). A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry
Elsevier., 634(1), 22-30.
https://doi.org/10.1016/j.jelechem.2009.07.001

Obradović M, Vuković G, Stevanović S, Panić V, Uskoković PS, Kowal A, Gojković SL. A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry. 2009;634(1):22-30.
doi:10.1016/j.jelechem.2009.07.001 .

Obradović, Maja, Vuković, G.D., Stevanović, Sanja, Panić, Vladimir, Uskoković, Petar S., Kowal, Andrzej, Gojković, Snežana Lj., "A comparative study of the electrochemical properties of carbon nanotubes and carbon black" in Journal of Electroanalytical Chemistry, 634, no. 1 (2009):22-30,
https://doi.org/10.1016/j.jelechem.2009.07.001 . .

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  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Tripković, Dušan
AU  - Jovanović, Vladislava M.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/489
AB  - The contribution of carbon functional groups (CFG) to methanol oxidation at carbon-supported Pt catalysts is studied in this work. Platinum black, attached in a form of a thin layer to electrochemically treated glassy carbon (GC), is investigated as a model system. Impedance measurements reveal significant changes in capacitive response of GC anodically polarized in H2SO4 solution in comparison to unoxidized state. XPS analyses show the increased fraction of oxygen-containing CFGs upon electrochemical treatment of GC. The activity of Pt black attached to oxidized GC for methanol oxidation is more than two times larger in comparison to the catalyst attached to unoxidized GC. Increased activity is most likely due to the promotion Of COads removal by increased content of CFGs.
PB  - Elsevier Science Inc, New York
T2  - Electrochemistry Communications
T1  - Promoting effect of carbon functional groups in methanol oxidation on supported Pt catalyst
VL  - 11
IS  - 1
SP  - 18
EP  - 21
DO  - 10.1016/j.elecom.2008.10.021
ER  - 

@article{
author = "Stevanović, Sanja and Panić, Vladimir and Tripković, Dušan and Jovanović, Vladislava M.",
year = "2009",
abstract = "The contribution of carbon functional groups (CFG) to methanol oxidation at carbon-supported Pt catalysts is studied in this work. Platinum black, attached in a form of a thin layer to electrochemically treated glassy carbon (GC), is investigated as a model system. Impedance measurements reveal significant changes in capacitive response of GC anodically polarized in H2SO4 solution in comparison to unoxidized state. XPS analyses show the increased fraction of oxygen-containing CFGs upon electrochemical treatment of GC. The activity of Pt black attached to oxidized GC for methanol oxidation is more than two times larger in comparison to the catalyst attached to unoxidized GC. Increased activity is most likely due to the promotion Of COads removal by increased content of CFGs.",
publisher = "Elsevier Science Inc, New York",
journal = "Electrochemistry Communications",
title = "Promoting effect of carbon functional groups in methanol oxidation on supported Pt catalyst",
volume = "11",
number = "1",
pages = "18-21",
doi = "10.1016/j.elecom.2008.10.021"
}

Stevanović, S., Panić, V., Tripković, D.,& Jovanović, V. M.. (2009). Promoting effect of carbon functional groups in methanol oxidation on supported Pt catalyst. in Electrochemistry Communications
Elsevier Science Inc, New York., 11(1), 18-21.
https://doi.org/10.1016/j.elecom.2008.10.021

Stevanović S, Panić V, Tripković D, Jovanović VM. Promoting effect of carbon functional groups in methanol oxidation on supported Pt catalyst. in Electrochemistry Communications. 2009;11(1):18-21.
doi:10.1016/j.elecom.2008.10.021 .

Stevanović, Sanja, Panić, Vladimir, Tripković, Dušan, Jovanović, Vladislava M., "Promoting effect of carbon functional groups in methanol oxidation on supported Pt catalyst" in Electrochemistry Communications, 11, no. 1 (2009):18-21,
https://doi.org/10.1016/j.elecom.2008.10.021 . .

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  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Kowal, Andrzej
AU  - Panić, Vladimir
AU  - Gojković, Snežana Lj.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/376
AB  - The electrochemical characteristics of a mixture of Pt-black and WC powders and its catalytic activity for methanol and formic acid oxidation were investigated in acid solution. XRD and AFM measurements revealed that the WC powder employed for the investigation was a single-phase material consisting of crystallites/spherical particles of average size of about 50 nm, which were agglomerated into much larger particles. Cyclic voltammetry showed that the WC underwent electrochemical oxidation, producing tungstate species. In the case of the mixed Pt + WC powders, the tungstate species were deposited on the Pt as a thin film of hydrous tungsten oxide. Enhanced hydrogen intercalation in the hydrous tungsten oxide was observed and it was proposed to be promoted in mixed powders by the presence of hydrogen adatoms on bare Pt sites. The determination of Pt surface area in the Pt + WC layer by stripping of underpotentially deposited Cu revealed that the entire Pt surface was accessible for underpotential deposition of Cu. Investigation of the electrochemical oxidation of methanol and formic acid on Pt + WC and pure Pt layers did not indicate electrocatalytic promotion due to the presence of WC.
AB  - U radu su ispitivane elektrohemijske karakteristike smeše prahova Pt i WC i njena katalitička aktivnost za reakcije oksidacije metanola i mravlje kiseline u kiselom rastvoru. Analiza rezultata difrakcije X-zraka (XRD) i mikroskopije atomskih sila (AFM) pokazuju da je prah WC jednofazni materijal sa prosečnom veličinom kristalita od oko 50 nm, koji su aglomerisani u mnogo veće čestice. Ciklična voltametrija ukazuje na to da WC podleže oksidaciji kojom nastaju volframatne vrste. U slučaju smeše prahova Pt i WC, volframatne vrste najverovatnije se talože na Pt u obliku tankog sloja hidratisanih oksida volframa. Primećeno je povećanje interkalacije vodonika u sloju hidratisanih volframata i pretpostavlja se da prisustvo adatoma vodonika na površini Pt potpomaže proces vodonične interkalacije. Određivanje površine Pt u sloju Pt + WC desorpcijom monosloja Cu taloženog na potpotencijalima ukazuje da je čitava površina Pt dostupna za taloženje atoma Cu. Ispitivanje elektrohemijskih reakcija oksidacije metanola i mravlje kiseline na sloju smeše Pt + WC i sloju čiste Pt ukazuje da prisustvo praha WC ne utiče na elektrokatalitička svojstva Pt.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical properties of mixed WC and Pt-black powders
T1  - Elektrohemijska svojstva smeše prahova WC i Pt
VL  - 73
IS  - 12
SP  - 1197
EP  - 1209
DO  - 10.2298/JSC0812197O
ER  - 

@article{
author = "Obradović, Maja and Babić, Biljana M. and Kowal, Andrzej and Panić, Vladimir and Gojković, Snežana Lj.",
year = "2008",
abstract = "The electrochemical characteristics of a mixture of Pt-black and WC powders and its catalytic activity for methanol and formic acid oxidation were investigated in acid solution. XRD and AFM measurements revealed that the WC powder employed for the investigation was a single-phase material consisting of crystallites/spherical particles of average size of about 50 nm, which were agglomerated into much larger particles. Cyclic voltammetry showed that the WC underwent electrochemical oxidation, producing tungstate species. In the case of the mixed Pt + WC powders, the tungstate species were deposited on the Pt as a thin film of hydrous tungsten oxide. Enhanced hydrogen intercalation in the hydrous tungsten oxide was observed and it was proposed to be promoted in mixed powders by the presence of hydrogen adatoms on bare Pt sites. The determination of Pt surface area in the Pt + WC layer by stripping of underpotentially deposited Cu revealed that the entire Pt surface was accessible for underpotential deposition of Cu. Investigation of the electrochemical oxidation of methanol and formic acid on Pt + WC and pure Pt layers did not indicate electrocatalytic promotion due to the presence of WC., U radu su ispitivane elektrohemijske karakteristike smeše prahova Pt i WC i njena katalitička aktivnost za reakcije oksidacije metanola i mravlje kiseline u kiselom rastvoru. Analiza rezultata difrakcije X-zraka (XRD) i mikroskopije atomskih sila (AFM) pokazuju da je prah WC jednofazni materijal sa prosečnom veličinom kristalita od oko 50 nm, koji su aglomerisani u mnogo veće čestice. Ciklična voltametrija ukazuje na to da WC podleže oksidaciji kojom nastaju volframatne vrste. U slučaju smeše prahova Pt i WC, volframatne vrste najverovatnije se talože na Pt u obliku tankog sloja hidratisanih oksida volframa. Primećeno je povećanje interkalacije vodonika u sloju hidratisanih volframata i pretpostavlja se da prisustvo adatoma vodonika na površini Pt potpomaže proces vodonične interkalacije. Određivanje površine Pt u sloju Pt + WC desorpcijom monosloja Cu taloženog na potpotencijalima ukazuje da je čitava površina Pt dostupna za taloženje atoma Cu. Ispitivanje elektrohemijskih reakcija oksidacije metanola i mravlje kiseline na sloju smeše Pt + WC i sloju čiste Pt ukazuje da prisustvo praha WC ne utiče na elektrokatalitička svojstva Pt.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical properties of mixed WC and Pt-black powders, Elektrohemijska svojstva smeše prahova WC i Pt",
volume = "73",
number = "12",
pages = "1197-1209",
doi = "10.2298/JSC0812197O"
}

Obradović, M., Babić, B. M., Kowal, A., Panić, V.,& Gojković, S. Lj.. (2008). Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(12), 1197-1209.
https://doi.org/10.2298/JSC0812197O

Obradović M, Babić BM, Kowal A, Panić V, Gojković SL. Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society. 2008;73(12):1197-1209.
doi:10.2298/JSC0812197O .

Obradović, Maja, Babić, Biljana M., Kowal, Andrzej, Panić, Vladimir, Gojković, Snežana Lj., "Electrochemical properties of mixed WC and Pt-black powders" in Journal of the Serbian Chemical Society, 73, no. 12 (2008):1197-1209,
https://doi.org/10.2298/JSC0812197O . .

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 . .

TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Hackerman, Norman
AU  - Sovilj, Sofija P.
AU  - Jovanović, Vladislava M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/483
AB  - The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.
T2  - Journal of Solid State Electrochemistry
T1  - The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution
VL  - 12
IS  - 2
SP  - 155
EP  - 163
DO  - 10.1007/s10008-007-0375-4
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Hackerman, Norman and Sovilj, Sofija P. and Jovanović, Vladislava M.",
year = "2008",
abstract = "The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.",
journal = "Journal of Solid State Electrochemistry",
title = "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution",
volume = "12",
number = "2",
pages = "155-163",
doi = "10.1007/s10008-007-0375-4"
}

Babić-Samardžija, K., Hackerman, N., Sovilj, S. P.,& Jovanović, V. M.. (2008). The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry, 12(2), 155-163.
https://doi.org/10.1007/s10008-007-0375-4

Babić-Samardžija K, Hackerman N, Sovilj SP, Jovanović VM. The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry. 2008;12(2):155-163.
doi:10.1007/s10008-007-0375-4 .

Babić-Samardžija, Ksenija, Hackerman, Norman, Sovilj, Sofija P., Jovanović, Vladislava M., "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution" in Journal of Solid State Electrochemistry, 12, no. 2 (2008):155-163,
https://doi.org/10.1007/s10008-007-0375-4 . .

TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Jovanović, Vladislava M.
AU  - Sovilj, Sofija P.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/433
AB  - Four mixed-ligand cobalt(III) complexes (1-4) of the general formula [Co(Rdtc)cyclam](ClO4)2 and [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetra- azacyclotetradecane; Rdtc = thiomorpholine-(Timdtc) or 2-methylpiperidine-(2-Mepipdtc) dithiocarbamates; Rac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (Hfac) or 2,2,6,6-tetramethyl-3,5-heptanedionato (Tmhd), respectively) were electrochemically examined on a glassy carbon and an iron electrode in perchloric acid solution. The obtained results showed the influence of these complexes on hydrogen evolution, the oxygen reduction reaction and iron dissolution. The exhibited effects of the complexes on these reactions depend on structure related to the bidentate dithiocarbamato or b-diketonato ligand. The electrochemical properties of the complexes were correlated with molecular structure and parameters derived from spectral analysis and molecular modeling.
AB  - Četiri mešovito-ligandna kobalt(III) kompleksa opšte formule [Co(Rdtc)cyclam](ClO4)2 i [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetraazaciklotetradekan; Rdtc = tiomorfolin--(timdtc) ili 2-metilpiperidin-(2-mepipdtc) ditiokarbamat; Rac = 1,1,1,5,5,5-heksafluoro- -2,4-pentanedionato (hfac) ili 2,2,6,6-tetrametil-3,5-heptanedionato (tmhd)) ispitana su elektrohemijski na elektrodama od staklastog ugljenika i gvožđa u rastvoru perhlorata. Dobijeni rezultati ukazuju na to da ovi kompleksi utiču na izdvajanje vodonika, redukciju kiseonika kao i na rastvaranje gvožđa. Elektrohemijsko ponašanje zavisi od strukture koordinovanog bidentatnog ditiokarbamato ili b-diketonato liganda. Molekulska struktura kompleksnih jedinjenja određena je na osnovu spektroskopskih analiza i molekulskog modelovanja. Elektrokatalitički i inhibitorski efekat povezan je sa molekulskom strukturom kompleksa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes
T1  - Korelacija molekulske strukture i elektrohemijskih svojstava kobalt(III) kompleksa sa mešovitim ligandima
VL  - 73
IS  - 7
SP  - 761
EP  - 770
DO  - 10.2298/JSC0807761B
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Jovanović, Vladislava M. and Sovilj, Sofija P.",
year = "2008",
abstract = "Four mixed-ligand cobalt(III) complexes (1-4) of the general formula [Co(Rdtc)cyclam](ClO4)2 and [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetra- azacyclotetradecane; Rdtc = thiomorpholine-(Timdtc) or 2-methylpiperidine-(2-Mepipdtc) dithiocarbamates; Rac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (Hfac) or 2,2,6,6-tetramethyl-3,5-heptanedionato (Tmhd), respectively) were electrochemically examined on a glassy carbon and an iron electrode in perchloric acid solution. The obtained results showed the influence of these complexes on hydrogen evolution, the oxygen reduction reaction and iron dissolution. The exhibited effects of the complexes on these reactions depend on structure related to the bidentate dithiocarbamato or b-diketonato ligand. The electrochemical properties of the complexes were correlated with molecular structure and parameters derived from spectral analysis and molecular modeling., Četiri mešovito-ligandna kobalt(III) kompleksa opšte formule [Co(Rdtc)cyclam](ClO4)2 i [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetraazaciklotetradekan; Rdtc = tiomorfolin--(timdtc) ili 2-metilpiperidin-(2-mepipdtc) ditiokarbamat; Rac = 1,1,1,5,5,5-heksafluoro- -2,4-pentanedionato (hfac) ili 2,2,6,6-tetrametil-3,5-heptanedionato (tmhd)) ispitana su elektrohemijski na elektrodama od staklastog ugljenika i gvožđa u rastvoru perhlorata. Dobijeni rezultati ukazuju na to da ovi kompleksi utiču na izdvajanje vodonika, redukciju kiseonika kao i na rastvaranje gvožđa. Elektrohemijsko ponašanje zavisi od strukture koordinovanog bidentatnog ditiokarbamato ili b-diketonato liganda. Molekulska struktura kompleksnih jedinjenja određena je na osnovu spektroskopskih analiza i molekulskog modelovanja. Elektrokatalitički i inhibitorski efekat povezan je sa molekulskom strukturom kompleksa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes, Korelacija molekulske strukture i elektrohemijskih svojstava kobalt(III) kompleksa sa mešovitim ligandima",
volume = "73",
number = "7",
pages = "761-770",
doi = "10.2298/JSC0807761B"
}

Babić-Samardžija, K., Jovanović, V. M.,& Sovilj, S. P.. (2008). Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(7), 761-770.
https://doi.org/10.2298/JSC0807761B

Babić-Samardžija K, Jovanović VM, Sovilj SP. Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes. in Journal of the Serbian Chemical Society. 2008;73(7):761-770.
doi:10.2298/JSC0807761B .

Babić-Samardžija, Ksenija, Jovanović, Vladislava M., Sovilj, Sofija P., "Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes" in Journal of the Serbian Chemical Society, 73, no. 7 (2008):761-770,
https://doi.org/10.2298/JSC0807761B . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Kowal, Andrzej
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2881
AB  - Electrochemical oxidation of HCOOH in H2SO4 and HClO4 solutions was examined on thin film Pt2Ru3/C electrode. XRD pattern revealed that Pt2Ru3 alloy consisted of the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru. According to STM images, Pt2Ru3 particles size was between 2 and 6 nm. It was established that electrochemical oxidation of HCOOH commenced at −0.1 V versus SCE at Pt sites in the catalyst. Kinetic parameters indicated that dehydrogenation path was predominant. Dehydration occurs in parallel, but without significant poisoning by COad owing to oxidative removal by OH species on Ru atoms. The coverage of Pt2Ru3 surface by CO preadsorbed from the solution was found to be 24% lower when the surface was modified by irreversibly adsorbed Bi. Modification by Bi also shifted the onset potential for HCOOH oxidation for about 50 mV towards more negative values and consequently, increased the reaction rate for a factor of two. It was proposed that Ru acts through bifunctional mechanism, i.e. OH species adsorbed on Ru oxidizes COad from Pt sites, while Bi hinders the adsorption of CO on Pt sites via electronic and/or ensemble effects.
PB  - Elsevier
T2  - Electrochimica Acta
T1  - Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C
VL  - 53
SP  - 887
EP  - 893
DO  - 10.1016/j.electacta.2007.07.073
ER  - 

@article{
author = "Tripković, Amalija and Gojković, Snežana Lj. and Popović, Ksenija and Lović, Jelena and Kowal, Andrzej",
year = "2007",
abstract = "Electrochemical oxidation of HCOOH in H2SO4 and HClO4 solutions was examined on thin film Pt2Ru3/C electrode. XRD pattern revealed that Pt2Ru3 alloy consisted of the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru. According to STM images, Pt2Ru3 particles size was between 2 and 6 nm. It was established that electrochemical oxidation of HCOOH commenced at −0.1 V versus SCE at Pt sites in the catalyst. Kinetic parameters indicated that dehydrogenation path was predominant. Dehydration occurs in parallel, but without significant poisoning by COad owing to oxidative removal by OH species on Ru atoms. The coverage of Pt2Ru3 surface by CO preadsorbed from the solution was found to be 24% lower when the surface was modified by irreversibly adsorbed Bi. Modification by Bi also shifted the onset potential for HCOOH oxidation for about 50 mV towards more negative values and consequently, increased the reaction rate for a factor of two. It was proposed that Ru acts through bifunctional mechanism, i.e. OH species adsorbed on Ru oxidizes COad from Pt sites, while Bi hinders the adsorption of CO on Pt sites via electronic and/or ensemble effects.",
publisher = "Elsevier",
journal = "Electrochimica Acta",
title = "Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C",
volume = "53",
pages = "887-893",
doi = "10.1016/j.electacta.2007.07.073"
}

Tripković, A., Gojković, S. Lj., Popović, K., Lović, J.,& Kowal, A.. (2007). Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C. in Electrochimica Acta
Elsevier., 53, 887-893.
https://doi.org/10.1016/j.electacta.2007.07.073

Tripković A, Gojković SL, Popović K, Lović J, Kowal A. Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C. in Electrochimica Acta. 2007;53:887-893.
doi:10.1016/j.electacta.2007.07.073 .

Tripković, Amalija, Gojković, Snežana Lj., Popović, Ksenija, Lović, Jelena, Kowal, Andrzej, "Study of the kinetics and influence of Bi_irr on formic acid oxidation at Pt2Ru3/C" in Electrochimica Acta, 53 (2007):887-893,
https://doi.org/10.1016/j.electacta.2007.07.073 . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Popović, Ksenija
AU  - Lović, Jelena
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/290
AB  - The electrochemical oxidation of methanol in NaOH solution was examined on a thin film Pt2Ru3/C electrode. The XRD pattern revealed that the Pt2Ru3 alloy consisted of a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru. It was shown that in alkaline solution, the difference in activity between Pt/C and Pt2Ru3/C is significantly smaller than in acid solution. It is proposed that the reaction follows a quasi bifunctional mechanism. The kinetic parameters indicated that the chemical reaction between adsorbed COad and OHad species could be the rate limiting step.
AB  - Elektrohemijska oksidacija metanola ispitivana je na nanokatalizatoru Pt2Ru3 dispergovanom na aktivnom uglju kao nosaču u alkalnoj sredini. Katalizator je karakterisan difrakcijom X-zraka (XRD) i dobijeni rezultati su pokazali da se legura Pt2Ru3 sastoji od dve faze: čvrstog rastvora Ru u Pt i od malih količina čistog Ru ili čvrstog rastvora Pt u Ru. Poređenjem aktivnosti Pt/C i Pt2Ru3/C katalizatora u oksidaciji metanola u alkalnoj sredini, pokazano je da je ta razlika znatno manja nego u kiseloj sredini. Predložen je kvazi-bifunkcionalni mehanizam reakcije. Dobijeni kinetički parametri ukazuju na to da je hemijska reakcija između adsorbovanih COad i OHad čestica spori stupanj u oksidaciji metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media
T1  - Kinetika oksidacije metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini
VL  - 72
IS  - 11
SP  - 1095
EP  - 1101
DO  - 10.2298/JSC0711095T
ER  - 

@article{
author = "Tripković, Amalija and Popović, Ksenija and Lović, Jelena",
year = "2007",
abstract = "The electrochemical oxidation of methanol in NaOH solution was examined on a thin film Pt2Ru3/C electrode. The XRD pattern revealed that the Pt2Ru3 alloy consisted of a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru. It was shown that in alkaline solution, the difference in activity between Pt/C and Pt2Ru3/C is significantly smaller than in acid solution. It is proposed that the reaction follows a quasi bifunctional mechanism. The kinetic parameters indicated that the chemical reaction between adsorbed COad and OHad species could be the rate limiting step., Elektrohemijska oksidacija metanola ispitivana je na nanokatalizatoru Pt2Ru3 dispergovanom na aktivnom uglju kao nosaču u alkalnoj sredini. Katalizator je karakterisan difrakcijom X-zraka (XRD) i dobijeni rezultati su pokazali da se legura Pt2Ru3 sastoji od dve faze: čvrstog rastvora Ru u Pt i od malih količina čistog Ru ili čvrstog rastvora Pt u Ru. Poređenjem aktivnosti Pt/C i Pt2Ru3/C katalizatora u oksidaciji metanola u alkalnoj sredini, pokazano je da je ta razlika znatno manja nego u kiseloj sredini. Predložen je kvazi-bifunkcionalni mehanizam reakcije. Dobijeni kinetički parametri ukazuju na to da je hemijska reakcija između adsorbovanih COad i OHad čestica spori stupanj u oksidaciji metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media, Kinetika oksidacije metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini",
volume = "72",
number = "11",
pages = "1095-1101",
doi = "10.2298/JSC0711095T"
}

Tripković, A., Popović, K.,& Lović, J.. (2007). Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 72(11), 1095-1101.
https://doi.org/10.2298/JSC0711095T

Tripković A, Popović K, Lović J. Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media. in Journal of the Serbian Chemical Society. 2007;72(11):1095-1101.
doi:10.2298/JSC0711095T .

Tripković, Amalija, Popović, Ksenija, Lović, Jelena, "Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media" in Journal of the Serbian Chemical Society, 72, no. 11 (2007):1095-1101,
https://doi.org/10.2298/JSC0711095T . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Grgur, Branimir N.
AU  - Gojković, Snežana Lj.
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/262
AB  - Ni-W alloys were electrochemically deposited from an ammonia-citrate electrolyte on rotating disc electrode with a gold disc, by direct and pulsating current. The corrosion potential and kinetics of cathodic and anodic reaction were investigated on the alloys with molar fraction of tungsten from 0.11 to 0.25 in acid and neutral sulfate solutions of various pH. On the basis of kinetic equations resulting from these data, it was proposed that a barrier lazer of nickel and tungsten oxide was formed on the alloy surface preventing further alloy dissolution.
AB  - Prevlake legure Ni-W su elektrohemijski taložene iz amonijačno-citratnog elektrolita, na rotirajuću disk elektrodu od zlata, konstantnom i pulsirajućom strujom. Korozioni potencijal, kinetika katodne i anodne reakcije na elektrohemijski taloženim prevlakama legura Ni-W, sa udelom volframa od 0,11 do 0,25, su ispitivani u kiselim i neutralnim sulfatnim rastvorima, različitih pH vrednosti. Na osnovu dobijenih rezultata izvedene su kinetičke jednačine za katodnu i anodnu reakciju, koje ukazuju na formiranje barijernog sloja oksida volframa i nikla koji sprečava rastvaranje legure i delimično se redukuje pri katodnoj polarizaciji.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Kinetic of corrosion reactions in acid and neutral solutions on electrochemically deposited Ni-W alloys
T1  - Kinetika korozionih reakcija u kiselim i neutralnim rastvorima na elektrohemijski taloženim legurama Ni-W
VL  - 47
IS  - 2
SP  - 3
EP  - 10
UR  - https://hdl.handle.net/21.15107/rcub_cer_262
ER  - 

@article{
author = "Obradović, Maja and Grgur, Branimir N. and Gojković, Snežana Lj.",
year = "2006",
abstract = "Ni-W alloys were electrochemically deposited from an ammonia-citrate electrolyte on rotating disc electrode with a gold disc, by direct and pulsating current. The corrosion potential and kinetics of cathodic and anodic reaction were investigated on the alloys with molar fraction of tungsten from 0.11 to 0.25 in acid and neutral sulfate solutions of various pH. On the basis of kinetic equations resulting from these data, it was proposed that a barrier lazer of nickel and tungsten oxide was formed on the alloy surface preventing further alloy dissolution., Prevlake legure Ni-W su elektrohemijski taložene iz amonijačno-citratnog elektrolita, na rotirajuću disk elektrodu od zlata, konstantnom i pulsirajućom strujom. Korozioni potencijal, kinetika katodne i anodne reakcije na elektrohemijski taloženim prevlakama legura Ni-W, sa udelom volframa od 0,11 do 0,25, su ispitivani u kiselim i neutralnim sulfatnim rastvorima, različitih pH vrednosti. Na osnovu dobijenih rezultata izvedene su kinetičke jednačine za katodnu i anodnu reakciju, koje ukazuju na formiranje barijernog sloja oksida volframa i nikla koji sprečava rastvaranje legure i delimično se redukuje pri katodnoj polarizaciji.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Kinetic of corrosion reactions in acid and neutral solutions on electrochemically deposited Ni-W alloys, Kinetika korozionih reakcija u kiselim i neutralnim rastvorima na elektrohemijski taloženim legurama Ni-W",
volume = "47",
number = "2",
pages = "3-10",
url = "https://hdl.handle.net/21.15107/rcub_cer_262"
}

Obradović, M., Grgur, B. N.,& Gojković, S. Lj.. (2006). Kinetic of corrosion reactions in acid and neutral solutions on electrochemically deposited Ni-W alloys. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 47(2), 3-10.
https://hdl.handle.net/21.15107/rcub_cer_262

Obradović M, Grgur BN, Gojković SL. Kinetic of corrosion reactions in acid and neutral solutions on electrochemically deposited Ni-W alloys. in Zaštita materijala. 2006;47(2):3-10.
https://hdl.handle.net/21.15107/rcub_cer_262 .

Obradović, Maja, Grgur, Branimir N., Gojković, Snežana Lj., "Kinetic of corrosion reactions in acid and neutral solutions on electrochemically deposited Ni-W alloys" in Zaštita materijala, 47, no. 2 (2006):3-10,
https://hdl.handle.net/21.15107/rcub_cer_262 .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
AU  - Popović, Ksenija
AU  - Lović, Jelena
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/251
AB  - Methanol oxidation in acid solution was studied at platinum single crystals, Pt(hkl), as the model catalyst, and at nanostructural platinum supported on high surface area carbon, Pt/C, as the real catalyst. The linear extrapolation method was used to determine the beginning of hydroxyl anion adsorption. Structural sensitivity of the adsorption was proved and a correlation with the onset of the methanol oxidation current was established at all catalysts. Bisulfate and chloride anions were found to decrease the methanol oxidation rate, but probably did not influence the reaction parth. The specific activity for the reaction increased in the sequence Pt(110)  LT Pt/C  LT  Pt(111), suggesting that the activity of the supported Pt catalyst can be correlated with the activities of the dominating crystal planes on its surface.
AB  - Oksidacija metanola ispitivana je na niskoindeksnim Pt monokristalnim elektrodama (model katalizator) i na nanokatalizatoru Pt dispergovanom na aktivnom uglju kao nosaču (realni katalizator) u kiseloj sredini. Metoda linearne ekstrapolacije krivih zavisnosti količine naelektrisanja adsorpcije kiseoničnih čestica od potencijala korišćena je za određivanje početka adsorpcije OH anjona. Potvrđeno je da je adsorpcija OH čestica strukturno osetljiva reakcija i pokazana je korelacija sa početkom reakcije oksidacije metanola. Utvrđeno je da bisulfatni i hloridni anjoni iz nosećeg elektrolita smanjuju brzinu oksidacije metanola, ali verovatno ne utiču na reakcioni put. Elektrokatalitička aktivnost ispitivanih katalizatora rasla je u nizu Pt(110)  LT  Pt/C  LT  Pt(111) ukazujući na to da se aktivnost Pt nanokatalizatora može povezati sa udelima niskoindeksnih ravni na površini Pt nanočestice.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts
T1  - Oksidacija metanola na platinskim elektrodama u kiseloj sredini - poređenje model i realnih katalizatora
VL  - 71
IS  - 12
SP  - 1333
EP  - 1343
DO  - 10.2298/JSC0612333T
ER  - 

@article{
author = "Tripković, Amalija and Gojković, Snežana Lj. and Popović, Ksenija and Lović, Jelena",
year = "2006",
abstract = "Methanol oxidation in acid solution was studied at platinum single crystals, Pt(hkl), as the model catalyst, and at nanostructural platinum supported on high surface area carbon, Pt/C, as the real catalyst. The linear extrapolation method was used to determine the beginning of hydroxyl anion adsorption. Structural sensitivity of the adsorption was proved and a correlation with the onset of the methanol oxidation current was established at all catalysts. Bisulfate and chloride anions were found to decrease the methanol oxidation rate, but probably did not influence the reaction parth. The specific activity for the reaction increased in the sequence Pt(110)  LT Pt/C  LT  Pt(111), suggesting that the activity of the supported Pt catalyst can be correlated with the activities of the dominating crystal planes on its surface., Oksidacija metanola ispitivana je na niskoindeksnim Pt monokristalnim elektrodama (model katalizator) i na nanokatalizatoru Pt dispergovanom na aktivnom uglju kao nosaču (realni katalizator) u kiseloj sredini. Metoda linearne ekstrapolacije krivih zavisnosti količine naelektrisanja adsorpcije kiseoničnih čestica od potencijala korišćena je za određivanje početka adsorpcije OH anjona. Potvrđeno je da je adsorpcija OH čestica strukturno osetljiva reakcija i pokazana je korelacija sa početkom reakcije oksidacije metanola. Utvrđeno je da bisulfatni i hloridni anjoni iz nosećeg elektrolita smanjuju brzinu oksidacije metanola, ali verovatno ne utiču na reakcioni put. Elektrokatalitička aktivnost ispitivanih katalizatora rasla je u nizu Pt(110)  LT  Pt/C  LT  Pt(111) ukazujući na to da se aktivnost Pt nanokatalizatora može povezati sa udelima niskoindeksnih ravni na površini Pt nanočestice.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts, Oksidacija metanola na platinskim elektrodama u kiseloj sredini - poređenje model i realnih katalizatora",
volume = "71",
number = "12",
pages = "1333-1343",
doi = "10.2298/JSC0612333T"
}

Tripković, A., Gojković, S. Lj., Popović, K.,& Lović, J.. (2006). Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 71(12), 1333-1343.
https://doi.org/10.2298/JSC0612333T

Tripković A, Gojković SL, Popović K, Lović J. Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts. in Journal of the Serbian Chemical Society. 2006;71(12):1333-1343.
doi:10.2298/JSC0612333T .

Tripković, Amalija, Gojković, Snežana Lj., Popović, Ksenija, Lović, Jelena, "Methanol oxidation at platinum electrodes in acid solution: Comparison between model and real catalysts" in Journal of the Serbian Chemical Society, 71, no. 12 (2006):1333-1343,
https://doi.org/10.2298/JSC0612333T . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Popović, Ksenija
AU  - Stevanović, Rade M.
AU  - Socha, R.
AU  - Kowal, Andrzej
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2879
AB  - Formic acid oxidation in acid solution was examined on a PtBi alloy characterized by X-ray photoelectron spectroscopy. Three chemical states of Bi, i.e., PtBi or Bi(0), Bi2O3 and BiO(OH) were found. Electrochemical characterization revealed that PtBi follows the behavior of its constituents, as well as that Bi is not stable in the PtBi alloy. It was established that the activity of PtBi is highly dependent of the reduction/oxidation of Bi species. Oxidation of formic acid does not occur on Bi covered PtBi. Rotated PtBi showed impressive activity relative to polycrystalline Pt, with the onset potential shifted by 0.25 V towards more negative potentials, and attained steady state current densities at 0.05 V, higher by two and half orders of magnitude. The activity of PtBi is caused by UPD phenomena of Bi on Pt, which was electrochemically detected. In addition, based on XPS analysis, it is proposed that the activity of PtBi could also be caused by the bifunctional action of hydroxylated Bi species.
PB  - Elsevier
T2  - Electrochemistry Communication
T1  - Activity of a PtBi alloy in the electrochemical oxidation of formic acid
VL  - 8
IS  - 9
SP  - 1492
EP  - 1498
DO  - 10.1016/j.elecom.2006.07.005
ER  - 

@article{
author = "Tripković, Amalija and Popović, Ksenija and Stevanović, Rade M. and Socha, R. and Kowal, Andrzej",
year = "2006",
abstract = "Formic acid oxidation in acid solution was examined on a PtBi alloy characterized by X-ray photoelectron spectroscopy. Three chemical states of Bi, i.e., PtBi or Bi(0), Bi2O3 and BiO(OH) were found. Electrochemical characterization revealed that PtBi follows the behavior of its constituents, as well as that Bi is not stable in the PtBi alloy. It was established that the activity of PtBi is highly dependent of the reduction/oxidation of Bi species. Oxidation of formic acid does not occur on Bi covered PtBi. Rotated PtBi showed impressive activity relative to polycrystalline Pt, with the onset potential shifted by 0.25 V towards more negative potentials, and attained steady state current densities at 0.05 V, higher by two and half orders of magnitude. The activity of PtBi is caused by UPD phenomena of Bi on Pt, which was electrochemically detected. In addition, based on XPS analysis, it is proposed that the activity of PtBi could also be caused by the bifunctional action of hydroxylated Bi species.",
publisher = "Elsevier",
journal = "Electrochemistry Communication",
title = "Activity of a PtBi alloy in the electrochemical oxidation of formic acid",
volume = "8",
number = "9",
pages = "1492-1498",
doi = "10.1016/j.elecom.2006.07.005"
}

Tripković, A., Popović, K., Stevanović, R. M., Socha, R.,& Kowal, A.. (2006). Activity of a PtBi alloy in the electrochemical oxidation of formic acid. in Electrochemistry Communication
Elsevier., 8(9), 1492-1498.
https://doi.org/10.1016/j.elecom.2006.07.005

Tripković A, Popović K, Stevanović RM, Socha R, Kowal A. Activity of a PtBi alloy in the electrochemical oxidation of formic acid. in Electrochemistry Communication. 2006;8(9):1492-1498.
doi:10.1016/j.elecom.2006.07.005 .

Tripković, Amalija, Popović, Ksenija, Stevanović, Rade M., Socha, R., Kowal, Andrzej, "Activity of a PtBi alloy in the electrochemical oxidation of formic acid" in Electrochemistry Communication, 8, no. 9 (2006):1492-1498,
https://doi.org/10.1016/j.elecom.2006.07.005 . .