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  - 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  - 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 . .