TY  - JOUR
AU  - Stevanović, Sanja
AU  - Jovanović, Vladislava M.
AU  - Rogan, Jelena R.
AU  - Kowal, Andrzej
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1872
AB  - Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support.
AB  - Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction
T1  - Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola
VL  - 57
IS  - 2
SP  - 339
EP  - 345
DO  - 10.5937/ZasMat1602339S
ER  - 

@article{
author = "Stevanović, Sanja and Jovanović, Vladislava M. and Rogan, Jelena R. and Kowal, Andrzej",
year = "2016",
abstract = "Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support., Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction, Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola",
volume = "57",
number = "2",
pages = "339-345",
doi = "10.5937/ZasMat1602339S"
}

Stevanović, S., Jovanović, V. M., Rogan, J. R.,& Kowal, A.. (2016). Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 57(2), 339-345.
https://doi.org/10.5937/ZasMat1602339S

Stevanović S, Jovanović VM, Rogan JR, Kowal A. Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala. 2016;57(2):339-345.
doi:10.5937/ZasMat1602339S .

Stevanović, Sanja, Jovanović, Vladislava M., Rogan, Jelena R., Kowal, Andrzej, "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction" in Zaštita materijala, 57, no. 2 (2016):339-345,
https://doi.org/10.5937/ZasMat1602339S . .

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  - 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  - 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  - Terzić, Sanja
AU  - Tripković, Dušan
AU  - Jovanović, Vladislava M.
AU  - Tripković, Amalija
AU  - Kowal, Andrzej
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/315
AB  - The effects of the properties of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on glassy carbon (GC/Pt) for methanol oxidation in alkaline and acidic solutions were studied. Platinum was potentiostatically deposited on two glassy carbon samples, thermally treated at different temperatures, which were either polished or anodicaly polarised in acid (GCOX-AC/Pt) and in alkali (GCOX-AL/Pt). Anodic polarisation of glassy carbon, either in alkaline or acidic solution, enhances the activity of both types of GC/Pt electrodes for methanol oxidation. The activity of the catalysts follows the change in the properties of the glassy carbon support upon anodic treatment. The specific activity of the GCOX-AL/Pt electrode for this reaction in alkali is increased only a few times in comparison with the activity of the GC/Pt one. On the other hand, the specific activity of the GCOX-AC/Pt electrode for methanol oxidation in acid is about one order of magnitude higher than that of the GC/Pt electrode. The role of the substrate on the properties of catalyst is discussed in detail.
AB  - Ispitivan je uticaj osobina podloge od staklastog ugljenika na taloženje platinskih čestica i elektrokatalitičku aktivnost tako dobijene elektrode (GC/Pt) u reakciji oksidacije metanola u kiseloj i alkalnoj sredini. Platina je potenciostatski taložena na dva uzorka staklastog ugljenika, termički tretirana na različitim temperaturama, koji su polirani ili anodno polarizovani u kiselom GC OX-AC/Pt ili alkalnom (GC OX-A/Pt) rastvoru. Anodna polarizacija staklastog ugljenika bilo u kiselini ili u alkaliji pre taloženja platine dovodi do povećanja aktivnosti oba tipa GC/Pt elektroda za reakciju oksidacije metanola. Aktivnost Pt katalizatora prati promene u osobinama podloge od staklastog ugljenika koje nastaju usled anodne polarizacije. Specifična aktivnost GC OX-AL/Pt elektroda u oksidaciji metanola u alkalnim rastvorima povećava se samo nekoliko puta u odnosu na aktivnost katalizatora na poliranoj podlozi (GC/Pt). Sa druge strane, specifična aktivnost GC OX-AC/Pt elektroda u oksidaciji metanola u kiselim rastvorima u poređenju sa aktivnošću GC/Pt elektroda veća je praktično za ceo red veličine. U radu je takođe detaljno diskutovana uloga podloge na osobine katalizatora.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Effect of glassy carbon properties on the electrochemical deposition of platinum nano-catalyst and its activity for methanol oxidation
T1  - Efekat osobina staklastog ugljenika na elektrohemijski nataložen platinski nano-katalizator i njegovu aktivnost u oksidaciji metanola
VL  - 72
IS  - 2
SP  - 165
EP  - 181
DO  - 10.2298/JSC0702165T
ER  - 

@article{
author = "Terzić, Sanja and Tripković, Dušan and Jovanović, Vladislava M. and Tripković, Amalija and Kowal, Andrzej",
year = "2007",
abstract = "The effects of the properties of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on glassy carbon (GC/Pt) for methanol oxidation in alkaline and acidic solutions were studied. Platinum was potentiostatically deposited on two glassy carbon samples, thermally treated at different temperatures, which were either polished or anodicaly polarised in acid (GCOX-AC/Pt) and in alkali (GCOX-AL/Pt). Anodic polarisation of glassy carbon, either in alkaline or acidic solution, enhances the activity of both types of GC/Pt electrodes for methanol oxidation. The activity of the catalysts follows the change in the properties of the glassy carbon support upon anodic treatment. The specific activity of the GCOX-AL/Pt electrode for this reaction in alkali is increased only a few times in comparison with the activity of the GC/Pt one. On the other hand, the specific activity of the GCOX-AC/Pt electrode for methanol oxidation in acid is about one order of magnitude higher than that of the GC/Pt electrode. The role of the substrate on the properties of catalyst is discussed in detail., Ispitivan je uticaj osobina podloge od staklastog ugljenika na taloženje platinskih čestica i elektrokatalitičku aktivnost tako dobijene elektrode (GC/Pt) u reakciji oksidacije metanola u kiseloj i alkalnoj sredini. Platina je potenciostatski taložena na dva uzorka staklastog ugljenika, termički tretirana na različitim temperaturama, koji su polirani ili anodno polarizovani u kiselom GC OX-AC/Pt ili alkalnom (GC OX-A/Pt) rastvoru. Anodna polarizacija staklastog ugljenika bilo u kiselini ili u alkaliji pre taloženja platine dovodi do povećanja aktivnosti oba tipa GC/Pt elektroda za reakciju oksidacije metanola. Aktivnost Pt katalizatora prati promene u osobinama podloge od staklastog ugljenika koje nastaju usled anodne polarizacije. Specifična aktivnost GC OX-AL/Pt elektroda u oksidaciji metanola u alkalnim rastvorima povećava se samo nekoliko puta u odnosu na aktivnost katalizatora na poliranoj podlozi (GC/Pt). Sa druge strane, specifična aktivnost GC OX-AC/Pt elektroda u oksidaciji metanola u kiselim rastvorima u poređenju sa aktivnošću GC/Pt elektroda veća je praktično za ceo red veličine. U radu je takođe detaljno diskutovana uloga podloge na osobine katalizatora.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Effect of glassy carbon properties on the electrochemical deposition of platinum nano-catalyst and its activity for methanol oxidation, Efekat osobina staklastog ugljenika na elektrohemijski nataložen platinski nano-katalizator i njegovu aktivnost u oksidaciji metanola",
volume = "72",
number = "2",
pages = "165-181",
doi = "10.2298/JSC0702165T"
}

Terzić, S., Tripković, D., Jovanović, V. M., Tripković, A.,& Kowal, A.. (2007). Effect of glassy carbon properties on the electrochemical deposition of platinum nano-catalyst and its activity for methanol oxidation. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 72(2), 165-181.
https://doi.org/10.2298/JSC0702165T

Terzić S, Tripković D, Jovanović VM, Tripković A, Kowal A. Effect of glassy carbon properties on the electrochemical deposition of platinum nano-catalyst and its activity for methanol oxidation. in Journal of the Serbian Chemical Society. 2007;72(2):165-181.
doi:10.2298/JSC0702165T .

Terzić, Sanja, Tripković, Dušan, Jovanović, Vladislava M., Tripković, Amalija, Kowal, Andrzej, "Effect of glassy carbon properties on the electrochemical deposition of platinum nano-catalyst and its activity for methanol oxidation" in Journal of the Serbian Chemical Society, 72, no. 2 (2007):165-181,
https://doi.org/10.2298/JSC0702165T . .

TY  - JOUR
AU  - Terzić, Sanja
AU  - Jovanović, Vladislava M.
AU  - Tripković, Dušan
AU  - Kowal, Andrzej
AU  - Stoch, Jerzy
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/329
AB  - The effect of the electrochemical oxidation of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on oxidized glassy carbon were studied for methanol oxidation in H2SO4 solution. Platinum was potentiostatically deposited from H2SO4 + 6mM H2PtCl6 solution. Glassy carbon was anodically polarized in 1 M NaOH at 1.41 V (SCE) for 35 and 95 s and in 0.5 M H2SO4 at 2V (SCE) for 35; 95 s and 2.25 V for 35 and 95 s. Electrochemical treatment of the GC support leads to a better distribution of platinum on the substrate and has remarkable effect on the activity. The activity of the Pt/GCox electrode for methanol oxidation is larger than that of polycrystalline Pt and by more than one order of magnitude larger than that of a Pt/GC electrode. This increase in activity indicates the pronounced role of the organic residues of the GC support on the properties of Pt particles deposited on glassy carbon.
AB  - Katalizatori dobijeni nanošenjem platine na karbon razvijene površine ispituju se već duži niz godina zbog njihove potencijalne primene u gorivim spregovima. Efekat elektrohemijske oksidacije staklastog ugljenika na depoziciju platinskih čestica i elektrokatalitičku aktivnost platine deponovane na oksidovani staklasti ugljenik je ispitivan za reakciju oksidacije metanola u H2SO4 i NaOH rastvoru. Platina je deponovana potenciostatskom pulsnom metodom iz 0,5M H2SO4+6mM H2PtCl6, rastvora. Staklasti ugljenik je anodno polarizovan u alkalnoj sredini (1 M NaOH na 1,41V (ZKE) u toku 35 i 95s) i kiseloj sredini (0,5M H2SO4 na 2 V (ZKE) u toku 35; 95s i 2,25V u toku 35 i 95 s). Elektrohemijski tretman GC podloge vodi ka boljoj distribuciji platine i pokazuje značajno veliki uticaj na aktivnost. Aktivnost GCox/Pt elektrode anodno oksidovane pri 2,25 V u toku 35 s je veća odpolikristalne platine a za red veličine veća od GC/Pt elektrode. Povećanje aktivnosti posledica je izraženog uticaja organskih vrsta na GC podlozi na osobine platinskih čestica deponovanih na staklasti ugljenik.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Electrochemical and microstructural characterization of platinum supported on glassy carbon
T1  - Elektrohemijska, mikroskopska i spektroskopska karakterizacija platine nataložene na staklasti ugljenik
VL  - 61
IS  - 3
SP  - 135
EP  - 141
DO  - 10.2298/HEMIND0703135T
ER  - 

@article{
author = "Terzić, Sanja and Jovanović, Vladislava M. and Tripković, Dušan and Kowal, Andrzej and Stoch, Jerzy",
year = "2007",
abstract = "The effect of the electrochemical oxidation of glassy carbon on the deposition of platinum particles and the electrocatalytic activity of platinum supported on oxidized glassy carbon were studied for methanol oxidation in H2SO4 solution. Platinum was potentiostatically deposited from H2SO4 + 6mM H2PtCl6 solution. Glassy carbon was anodically polarized in 1 M NaOH at 1.41 V (SCE) for 35 and 95 s and in 0.5 M H2SO4 at 2V (SCE) for 35; 95 s and 2.25 V for 35 and 95 s. Electrochemical treatment of the GC support leads to a better distribution of platinum on the substrate and has remarkable effect on the activity. The activity of the Pt/GCox electrode for methanol oxidation is larger than that of polycrystalline Pt and by more than one order of magnitude larger than that of a Pt/GC electrode. This increase in activity indicates the pronounced role of the organic residues of the GC support on the properties of Pt particles deposited on glassy carbon., Katalizatori dobijeni nanošenjem platine na karbon razvijene površine ispituju se već duži niz godina zbog njihove potencijalne primene u gorivim spregovima. Efekat elektrohemijske oksidacije staklastog ugljenika na depoziciju platinskih čestica i elektrokatalitičku aktivnost platine deponovane na oksidovani staklasti ugljenik je ispitivan za reakciju oksidacije metanola u H2SO4 i NaOH rastvoru. Platina je deponovana potenciostatskom pulsnom metodom iz 0,5M H2SO4+6mM H2PtCl6, rastvora. Staklasti ugljenik je anodno polarizovan u alkalnoj sredini (1 M NaOH na 1,41V (ZKE) u toku 35 i 95s) i kiseloj sredini (0,5M H2SO4 na 2 V (ZKE) u toku 35; 95s i 2,25V u toku 35 i 95 s). Elektrohemijski tretman GC podloge vodi ka boljoj distribuciji platine i pokazuje značajno veliki uticaj na aktivnost. Aktivnost GCox/Pt elektrode anodno oksidovane pri 2,25 V u toku 35 s je veća odpolikristalne platine a za red veličine veća od GC/Pt elektrode. Povećanje aktivnosti posledica je izraženog uticaja organskih vrsta na GC podlozi na osobine platinskih čestica deponovanih na staklasti ugljenik.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Electrochemical and microstructural characterization of platinum supported on glassy carbon, Elektrohemijska, mikroskopska i spektroskopska karakterizacija platine nataložene na staklasti ugljenik",
volume = "61",
number = "3",
pages = "135-141",
doi = "10.2298/HEMIND0703135T"
}

Terzić, S., Jovanović, V. M., Tripković, D., Kowal, A.,& Stoch, J.. (2007). Electrochemical and microstructural characterization of platinum supported on glassy carbon. in Hemijska industrija
Association of Chemical Engineers of Serbia., 61(3), 135-141.
https://doi.org/10.2298/HEMIND0703135T

Terzić S, Jovanović VM, Tripković D, Kowal A, Stoch J. Electrochemical and microstructural characterization of platinum supported on glassy carbon. in Hemijska industrija. 2007;61(3):135-141.
doi:10.2298/HEMIND0703135T .

Terzić, Sanja, Jovanović, Vladislava M., Tripković, Dušan, Kowal, Andrzej, Stoch, Jerzy, "Electrochemical and microstructural characterization of platinum supported on glassy carbon" in Hemijska industrija, 61, no. 3 (2007):135-141,
https://doi.org/10.2298/HEMIND0703135T . .

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  - CONF
AU  - Kowal, Andrzej
AU  - Olszewski, Piotr K.
AU  - Tripković, Dušan
AU  - Stevanović, Rade M.
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/281
AB  - Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Pt-based catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or PtRu-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created.
C3  - Materials Science Forum
T1  - Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods
VL  - 518
SP  - 271
EP  - 276
DO  - 10.4028/www.scientific.net/MSF.518.271
ER  - 

@conference{
author = "Kowal, Andrzej and Olszewski, Piotr K. and Tripković, Dušan and Stevanović, Rade M.",
year = "2006",
abstract = "Electrodes, assigned as GC/Pt-C and GC/Pt-Ru-C, were formed by deposition of Pt-based catalysts (47.5 wt % Pt + high surface area carbon) and (54 wt. % Pt-Ru alloy + high surface area carbon) on glassy carbon (GC) discs. X-ray diffraction measurements were used for the determination of the average crystallite size and phase composition of both catalysts. Crystallite size for Pt-C catalyst was 2.9 nm for Pt-fcc. In the diffraction pattern of the Pt-Ru-C catalyst two phases, e.g. Pt-Ru-fcc and Ru-hcp were refined using the Rietveld method. Crystallite sizes were 3.9 nm for Pt-Ru-fcc and 2.8 nm for Ru-hcp. STM observations of the surface of GC/Pt-C and GC/Pt-Ru-C electrodes revealed the presence of metal particles of the size in the range 2-6 nm and Pt-C or PtRu-C agglomerates in the range of several tenth of nm. The thickness of the Nafion covering layer determined by AFM is ca. 100 nm. A simplified scheme of the investigated electrodes was created.",
journal = "Materials Science Forum",
title = "Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods",
volume = "518",
pages = "271-276",
doi = "10.4028/www.scientific.net/MSF.518.271"
}

Kowal, A., Olszewski, P. K., Tripković, D.,& Stevanović, R. M.. (2006). Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods. in Materials Science Forum, 518, 271-276.
https://doi.org/10.4028/www.scientific.net/MSF.518.271

Kowal A, Olszewski PK, Tripković D, Stevanović RM. Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods. in Materials Science Forum. 2006;518:271-276.
doi:10.4028/www.scientific.net/MSF.518.271 .

Kowal, Andrzej, Olszewski, Piotr K., Tripković, Dušan, Stevanović, Rade M., "Nanoscale topography of GC/Pt-C and GC/Pt-Ru-C electrodes studied by means of STM, AFM and XRD methods" in Materials Science Forum, 518 (2006):271-276,
https://doi.org/10.4028/www.scientific.net/MSF.518.271 . .

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 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Đurović, Dejan
AU  - Kowal, Andrzej
AU  - Petrović, Bisenija M.
AU  - Stojanović, V.
AU  - Maksimović, Miodrag D.
AU  - Stevanović, Rade M.
AU  - Despić, Aleksandar R.
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/199
AB  - The Ni-W alloys were electrochemically deposited from a ammonia-citrate electrolyte on rotation disc electrode with a replaceable steel disc, by direct and pulsed current. The aim of the paper is investigations of parameters of deposition, structure of alloys and temperature treatment on morphology and micro hardness of alloys.
AB  - Prevlake legure Ni-W su elektrohemijski taložene iz amonijačno-citratnog elektrolita, na rotirajuću disk elektrodu od čelika, konstantnom i pulsirajućom strujom. Cilj rada je ispitivanje uticaja parametara taloženja sastava legure i termičkog tretmana na morfologiju i mikrotvrdoću dobijenih prevlaka.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Properties of Ni-W alloys electrochemically deposited by direct and pulse current
T1  - Karakteristike legura Ni-W elektrohemijski taloženih konstantnom i pulsirajućom strujom
VL  - 46
IS  - 3
SP  - 5
EP  - 12
UR  - https://hdl.handle.net/21.15107/rcub_cer_199
ER  - 

@article{
author = "Obradović, Maja and Đurović, Dejan and Kowal, Andrzej and Petrović, Bisenija M. and Stojanović, V. and Maksimović, Miodrag D. and Stevanović, Rade M. and Despić, Aleksandar R.",
year = "2005",
abstract = "The Ni-W alloys were electrochemically deposited from a ammonia-citrate electrolyte on rotation disc electrode with a replaceable steel disc, by direct and pulsed current. The aim of the paper is investigations of parameters of deposition, structure of alloys and temperature treatment on morphology and micro hardness of alloys., Prevlake legure Ni-W su elektrohemijski taložene iz amonijačno-citratnog elektrolita, na rotirajuću disk elektrodu od čelika, konstantnom i pulsirajućom strujom. Cilj rada je ispitivanje uticaja parametara taloženja sastava legure i termičkog tretmana na morfologiju i mikrotvrdoću dobijenih prevlaka.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Properties of Ni-W alloys electrochemically deposited by direct and pulse current, Karakteristike legura Ni-W elektrohemijski taloženih konstantnom i pulsirajućom strujom",
volume = "46",
number = "3",
pages = "5-12",
url = "https://hdl.handle.net/21.15107/rcub_cer_199"
}

Obradović, M., Đurović, D., Kowal, A., Petrović, B. M., Stojanović, V., Maksimović, M. D., Stevanović, R. M.,& Despić, A. R.. (2005). Properties of Ni-W alloys electrochemically deposited by direct and pulse current. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 46(3), 5-12.
https://hdl.handle.net/21.15107/rcub_cer_199

Obradović M, Đurović D, Kowal A, Petrović BM, Stojanović V, Maksimović MD, Stevanović RM, Despić AR. Properties of Ni-W alloys electrochemically deposited by direct and pulse current. in Zaštita materijala. 2005;46(3):5-12.
https://hdl.handle.net/21.15107/rcub_cer_199 .

Obradović, Maja, Đurović, Dejan, Kowal, Andrzej, Petrović, Bisenija M., Stojanović, V., Maksimović, Miodrag D., Stevanović, Rade M., Despić, Aleksandar R., "Properties of Ni-W alloys electrochemically deposited by direct and pulse current" in Zaštita materijala, 46, no. 3 (2005):5-12,
https://hdl.handle.net/21.15107/rcub_cer_199 .

TY  - JOUR
AU  - Jovanović, Vladislava M.
AU  - Tripković, Dušan
AU  - Tripković, Amalija
AU  - Kowal, Andrzej
AU  - Stoch, Jerzy
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/185
AB  - Formic acid oxidation at platinum electrochemically deposited on polished (GC/Pt) and oxidized glassy carbon (GC(ox)/Pt) was examined with the objective of studying the effect of electrochemical treatment of the support on deposition of platinum and on the activity of Pt catalyst. The electrodes were characterised by STM and XPS techniques. The oxidative treatment of the support leads to deposition of smaller Pt particles in comparison with the one on the polished substrate. The XPS spectra indicated the increased fraction of functional (acidic) groups on the treated support as well as the higher fraction of oxygen containing species on Pt catalyst deposited on oxidised referring to Pt deposited on polished substrate. The activity of GC(ox)/Pt electrode is increased by the factor of 2-4 for formic acid oxidation compared to the activity of GC/Pt electrode. This result is explained by the oxidative removal Of COad species leading to enhanced amount of Pt free sites available for direct formic acid oxidation to CO2.
PB  - Elsevier
T2  - Electrochemistry Communications
T1  - Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon
VL  - 7
IS  - 10
SP  - 1039
EP  - 1044
DO  - 10.1016/j.elecom.2005.07.009
ER  - 

@article{
author = "Jovanović, Vladislava M. and Tripković, Dušan and Tripković, Amalija and Kowal, Andrzej and Stoch, Jerzy",
year = "2005",
abstract = "Formic acid oxidation at platinum electrochemically deposited on polished (GC/Pt) and oxidized glassy carbon (GC(ox)/Pt) was examined with the objective of studying the effect of electrochemical treatment of the support on deposition of platinum and on the activity of Pt catalyst. The electrodes were characterised by STM and XPS techniques. The oxidative treatment of the support leads to deposition of smaller Pt particles in comparison with the one on the polished substrate. The XPS spectra indicated the increased fraction of functional (acidic) groups on the treated support as well as the higher fraction of oxygen containing species on Pt catalyst deposited on oxidised referring to Pt deposited on polished substrate. The activity of GC(ox)/Pt electrode is increased by the factor of 2-4 for formic acid oxidation compared to the activity of GC/Pt electrode. This result is explained by the oxidative removal Of COad species leading to enhanced amount of Pt free sites available for direct formic acid oxidation to CO2.",
publisher = "Elsevier",
journal = "Electrochemistry Communications",
title = "Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon",
volume = "7",
number = "10",
pages = "1039-1044",
doi = "10.1016/j.elecom.2005.07.009"
}

Jovanović, V. M., Tripković, D., Tripković, A., Kowal, A.,& Stoch, J.. (2005). Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon. in Electrochemistry Communications
Elsevier., 7(10), 1039-1044.
https://doi.org/10.1016/j.elecom.2005.07.009

Jovanović VM, Tripković D, Tripković A, Kowal A, Stoch J. Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon. in Electrochemistry Communications. 2005;7(10):1039-1044.
doi:10.1016/j.elecom.2005.07.009 .

Jovanović, Vladislava M., Tripković, Dušan, Tripković, Amalija, Kowal, Andrzej, Stoch, Jerzy, "Oxidation of formic acid on platinum electrodeposited on polished and oxidized glassy carbon" in Electrochemistry Communications, 7, no. 10 (2005):1039-1044,
https://doi.org/10.1016/j.elecom.2005.07.009 . .

TY  - JOUR
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
AU  - Popović, Ksenija
AU  - Tripković, Dušan
AU  - Olszewski, Piotr K.
AU  - Kowal, Andrzej
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/209
AB  - Oxidation of formic acid on the platinum catalyst supported on high area carbon was investigated by potent iodynamic and quasi-steady-state polarization measurements. It was found that the poisoning of the reaction occurred both in the hydrogen region and in the double-layer region, but poisons were formed faster at lower potentials. Kinetics of the reaction was consistent with the dual path mechanism. At lower potentials HCOOH was oxidized to CO, at the Pt sites uncovered by COads. If high coverage by the poisoning species was attained, the reaction reached the limiting current plateau and further increase of the Current densities started at the potential of COads oxidation. Kinetic parameters of the HCOOH oxidation suggested that the rate determining step was the transfer of the first electron from HCOOHads, which was adsorbed under the Temkin conditions, Oxidation of formic acid became pH-dependent reaction in the electrolytes of pH  LT  1 with the reaction order with respect to H+ ions of about - 0.8.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst
VL  - 581
IS  - 2
SP  - 294
EP  - 302
DO  - 10.1016/j.jelechem.2005.05.002
ER  - 

@article{
author = "Lović, Jelena and Tripković, Amalija and Gojković, Snežana Lj. and Popović, Ksenija and Tripković, Dušan and Olszewski, Piotr K. and Kowal, Andrzej",
year = "2005",
abstract = "Oxidation of formic acid on the platinum catalyst supported on high area carbon was investigated by potent iodynamic and quasi-steady-state polarization measurements. It was found that the poisoning of the reaction occurred both in the hydrogen region and in the double-layer region, but poisons were formed faster at lower potentials. Kinetics of the reaction was consistent with the dual path mechanism. At lower potentials HCOOH was oxidized to CO, at the Pt sites uncovered by COads. If high coverage by the poisoning species was attained, the reaction reached the limiting current plateau and further increase of the Current densities started at the potential of COads oxidation. Kinetic parameters of the HCOOH oxidation suggested that the rate determining step was the transfer of the first electron from HCOOHads, which was adsorbed under the Temkin conditions, Oxidation of formic acid became pH-dependent reaction in the electrolytes of pH  LT  1 with the reaction order with respect to H+ ions of about - 0.8.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst",
volume = "581",
number = "2",
pages = "294-302",
doi = "10.1016/j.jelechem.2005.05.002"
}

Lović, J., Tripković, A., Gojković, S. Lj., Popović, K., Tripković, D., Olszewski, P. K.,& Kowal, A.. (2005). Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst. in Journal of Electroanalytical Chemistry
Elsevier., 581(2), 294-302.
https://doi.org/10.1016/j.jelechem.2005.05.002

Lović J, Tripković A, Gojković SL, Popović K, Tripković D, Olszewski PK, Kowal A. Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst. in Journal of Electroanalytical Chemistry. 2005;581(2):294-302.
doi:10.1016/j.jelechem.2005.05.002 .

Lović, Jelena, Tripković, Amalija, Gojković, Snežana Lj., Popović, Ksenija, Tripković, Dušan, Olszewski, Piotr K., Kowal, Andrzej, "Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst" in Journal of Electroanalytical Chemistry, 581, no. 2 (2005):294-302,
https://doi.org/10.1016/j.jelechem.2005.05.002 . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
AU  - Lović, Jelena
AU  - Popović, Ksenija
AU  - Kowal, Andrzej
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/173
AB  - The methanol oxidation was studied at two differently prepared supported Pt electrodes (Pt-C/GC and Pt/GC) in 0.5 M H2SO4 and 0.1 M NaOH. The supported Pt electrodes were characterized by AFM, STM TEM and HRTEM. The higher activity of Pt-C/GC than of Pt/GC catalyst, as well as negligible differences in the activities between the supported Pt catalysts and the corresponding single crystal electrodes oriented as the sites in the catalyst deposits in which Pt particles are dominant, clearly suggest the influence of the particle size effect on the catalyst activity.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Current Research in Advanced Materials and Processes
T1  - Particle size effect: Methanol oxidation on supported Pt catalysts
VL  - 494
SP  - 229
EP  - 234
DO  - 10.4028/www.scientific.net/MSF.494.229
ER  - 

@article{
author = "Tripković, Amalija and Jovanović, Vladislava M. and Lović, Jelena and Popović, Ksenija and Kowal, Andrzej",
year = "2005",
abstract = "The methanol oxidation was studied at two differently prepared supported Pt electrodes (Pt-C/GC and Pt/GC) in 0.5 M H2SO4 and 0.1 M NaOH. The supported Pt electrodes were characterized by AFM, STM TEM and HRTEM. The higher activity of Pt-C/GC than of Pt/GC catalyst, as well as negligible differences in the activities between the supported Pt catalysts and the corresponding single crystal electrodes oriented as the sites in the catalyst deposits in which Pt particles are dominant, clearly suggest the influence of the particle size effect on the catalyst activity.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Current Research in Advanced Materials and Processes",
title = "Particle size effect: Methanol oxidation on supported Pt catalysts",
volume = "494",
pages = "229-234",
doi = "10.4028/www.scientific.net/MSF.494.229"
}

Tripković, A., Jovanović, V. M., Lović, J., Popović, K.,& Kowal, A.. (2005). Particle size effect: Methanol oxidation on supported Pt catalysts. in Current Research in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 494, 229-234.
https://doi.org/10.4028/www.scientific.net/MSF.494.229

Tripković A, Jovanović VM, Lović J, Popović K, Kowal A. Particle size effect: Methanol oxidation on supported Pt catalysts. in Current Research in Advanced Materials and Processes. 2005;494:229-234.
doi:10.4028/www.scientific.net/MSF.494.229 .

Tripković, Amalija, Jovanović, Vladislava M., Lović, Jelena, Popović, Ksenija, Kowal, Andrzej, "Particle size effect: Methanol oxidation on supported Pt catalysts" in Current Research in Advanced Materials and Processes, 494 (2005):229-234,
https://doi.org/10.4028/www.scientific.net/MSF.494.229 . .

TY  - JOUR
AU  - Tripković, Amalija
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Jovanović, Vladislava M.
AU  - Kowal, Andrzej
PY  - 2004
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2884
AB  - Methanol oxidation was studied in 0.1 M NaOH at supported Pt electrodes, and compared with the single crystal Pt electrodes, Pt(1 1 1), Pt(1 1 0) and Pt(3 3 2), chosen as model systems, and with a polycrystalline Pt electrode. The supported Pt electrodes were obtained by chemical (Pt–C/GC) and electrochemical (Pt/GC) deposition of the catalyst layer on glassy carbon resulting in the same metal loading of 20 μgPt cm−2. Using STM in air, the average particle size distributions, 3–6 nm at Pt–C/GC and 4–32 nm at Pt/GC were determined. Both supported Pt catalysts were less active than polycrystalline Pt. Negligible differences in the kinetics observed between Pt–C/GC and Pt(1 1 0) and also Pt/GC and Pt(1 1 1) suggested that the activities of supported Pt electrodes could be correlated with the activities of single crystal Pt electrodes oriented as the sites dominating in the Pt particles in catalyst deposits. The electrocatalytic activities of the electrodes studied increase in the sequence: Pt(3 3 2) > polycrystalline Pt > Pt–C/GC ∼ Pt(1 1 0) > Pt/GC ∼ Pt(1 1 1). On the basis of diagnostic criteria obtained, the chemical reaction between HCOad and OHad giving formate was proposed as the rate limiting step in methanol oxidation.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Methanol oxidation at platinum electrodes in alkaline solution: comparison between supported catalysts and model system
VL  - 572
IS  - 1
SP  - 119
EP  - 128
DO  - 10.1016/j.jelechem.2004.06.007
ER  - 

@article{
author = "Tripković, Amalija and Popović, Ksenija and Lović, Jelena and Jovanović, Vladislava M. and Kowal, Andrzej",
year = "2004",
abstract = "Methanol oxidation was studied in 0.1 M NaOH at supported Pt electrodes, and compared with the single crystal Pt electrodes, Pt(1 1 1), Pt(1 1 0) and Pt(3 3 2), chosen as model systems, and with a polycrystalline Pt electrode. The supported Pt electrodes were obtained by chemical (Pt–C/GC) and electrochemical (Pt/GC) deposition of the catalyst layer on glassy carbon resulting in the same metal loading of 20 μgPt cm−2. Using STM in air, the average particle size distributions, 3–6 nm at Pt–C/GC and 4–32 nm at Pt/GC were determined. Both supported Pt catalysts were less active than polycrystalline Pt. Negligible differences in the kinetics observed between Pt–C/GC and Pt(1 1 0) and also Pt/GC and Pt(1 1 1) suggested that the activities of supported Pt electrodes could be correlated with the activities of single crystal Pt electrodes oriented as the sites dominating in the Pt particles in catalyst deposits. The electrocatalytic activities of the electrodes studied increase in the sequence: Pt(3 3 2) > polycrystalline Pt > Pt–C/GC ∼ Pt(1 1 0) > Pt/GC ∼ Pt(1 1 1). On the basis of diagnostic criteria obtained, the chemical reaction between HCOad and OHad giving formate was proposed as the rate limiting step in methanol oxidation.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Methanol oxidation at platinum electrodes in alkaline solution: comparison between supported catalysts and model system",
volume = "572",
number = "1",
pages = "119-128",
doi = "10.1016/j.jelechem.2004.06.007"
}

Tripković, A., Popović, K., Lović, J., Jovanović, V. M.,& Kowal, A.. (2004). Methanol oxidation at platinum electrodes in alkaline solution: comparison between supported catalysts and model system. in Journal of Electroanalytical Chemistry
Elsevier., 572(1), 119-128.
https://doi.org/10.1016/j.jelechem.2004.06.007

Tripković A, Popović K, Lović J, Jovanović VM, Kowal A. Methanol oxidation at platinum electrodes in alkaline solution: comparison between supported catalysts and model system. in Journal of Electroanalytical Chemistry. 2004;572(1):119-128.
doi:10.1016/j.jelechem.2004.06.007 .

Tripković, Amalija, Popović, Ksenija, Lović, Jelena, Jovanović, Vladislava M., Kowal, Andrzej, "Methanol oxidation at platinum electrodes in alkaline solution: comparison between supported catalysts and model system" in Journal of Electroanalytical Chemistry, 572, no. 1 (2004):119-128,
https://doi.org/10.1016/j.jelechem.2004.06.007 . .