The kinetics of methanol oxidation on supported 47.5 wt.% Pt and 54 wt.% PtRu (with nominal Pt:Ru ratios of 2:3) catalysts are measured in 0.5 M H2SO4 and 0.1 NaOH at 295 and 333 K using thin-film rotating disk electrode (RDE) method. It was found that the activity of Pt and PtRu for methanol oxidation is a strong function of pH of solution and temperature. The kinetics are much higher in alkaline than in acid solution; at 333 K, a factor of 30 for Pt and a factor of 20 for Pt2Ru3 at 0.5 V. The pH effect is attributed to the pH competitive adsorption of oxygenated species with anions from supporting electrolytes. The activity of Pt and Pt2Ru3 catalysts at 333 K is higher (a factor of 5) than at 295 K. Irrespective of pH, only negligible differences in the kinetics are observed between Pt and on high Ru content Pt alloys, presumably owing to a slow rate of methanol dehydrogenation on the Ru-rich surface and insufficient number of Pt sites required for dissociative chemisorption of met...hanol.
Keywords:
Rotating disk electrode (RDE) / Pt-Ru alloy / Transmission electron microscopy (TEM) / X-ray diffraction (XRD)
Source:
Electrochimica Acta, 2002, 47, 3707-3714
Publisher:
Elsevier
Funding / projects:
US Department of Energy (USDOE) Contract No. DE-AC03-76SF00098
Ministry of Science, Technology and Development of Serbia, Contract No. X-1796
TY - JOUR
AU - Tripković, Amalija
AU - Popović, Ksenija
AU - Grgur, Branimir N.
AU - Blizanac, B.
AU - Ross, Phillip N.
AU - Marković, Nenad M.
PY - 2002
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/2883
AB - The kinetics of methanol oxidation on supported 47.5 wt.% Pt and 54 wt.% PtRu (with nominal Pt:Ru ratios of 2:3) catalysts are measured in 0.5 M H2SO4 and 0.1 NaOH at 295 and 333 K using thin-film rotating disk electrode (RDE) method. It was found that the activity of Pt and PtRu for methanol oxidation is a strong function of pH of solution and temperature. The kinetics are much higher in alkaline than in acid solution; at 333 K, a factor of 30 for Pt and a factor of 20 for Pt2Ru3 at 0.5 V. The pH effect is attributed to the pH competitive adsorption of oxygenated species with anions from supporting electrolytes. The activity of Pt and Pt2Ru3 catalysts at 333 K is higher (a factor of 5) than at 295 K. Irrespective of pH, only negligible differences in the kinetics are observed between Pt and on high Ru content Pt alloys, presumably owing to a slow rate of methanol dehydrogenation on the Ru-rich surface and insufficient number of Pt sites required for dissociative chemisorption of methanol.
PB - Elsevier
T2 - Electrochimica Acta
T1 - Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions
VL - 47
SP - 3707
EP - 3714
DO - 10.1016/S0013-4686(02)00340-7
ER -
@article{
author = "Tripković, Amalija and Popović, Ksenija and Grgur, Branimir N. and Blizanac, B. and Ross, Phillip N. and Marković, Nenad M.",
year = "2002",
abstract = "The kinetics of methanol oxidation on supported 47.5 wt.% Pt and 54 wt.% PtRu (with nominal Pt:Ru ratios of 2:3) catalysts are measured in 0.5 M H2SO4 and 0.1 NaOH at 295 and 333 K using thin-film rotating disk electrode (RDE) method. It was found that the activity of Pt and PtRu for methanol oxidation is a strong function of pH of solution and temperature. The kinetics are much higher in alkaline than in acid solution; at 333 K, a factor of 30 for Pt and a factor of 20 for Pt2Ru3 at 0.5 V. The pH effect is attributed to the pH competitive adsorption of oxygenated species with anions from supporting electrolytes. The activity of Pt and Pt2Ru3 catalysts at 333 K is higher (a factor of 5) than at 295 K. Irrespective of pH, only negligible differences in the kinetics are observed between Pt and on high Ru content Pt alloys, presumably owing to a slow rate of methanol dehydrogenation on the Ru-rich surface and insufficient number of Pt sites required for dissociative chemisorption of methanol.",
publisher = "Elsevier",
journal = "Electrochimica Acta",
title = "Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions",
volume = "47",
pages = "3707-3714",
doi = "10.1016/S0013-4686(02)00340-7"
}
Tripković, A., Popović, K., Grgur, B. N., Blizanac, B., Ross, P. N.,& Marković, N. M.. (2002). Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions. in Electrochimica Acta
Elsevier., 47, 3707-3714.
https://doi.org/10.1016/S0013-4686(02)00340-7
Tripković A, Popović K, Grgur BN, Blizanac B, Ross PN, Marković NM. Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions. in Electrochimica Acta. 2002;47:3707-3714.
doi:10.1016/S0013-4686(02)00340-7 .
Tripković, Amalija, Popović, Ksenija, Grgur, Branimir N., Blizanac, B., Ross, Phillip N., Marković, Nenad M., "Methanol electrooxidation on supported Pt and Pt-Ru catalysts in acid and alkaline solutions" in Electrochimica Acta, 47 (2002):3707-3714,
https://doi.org/10.1016/S0013-4686(02)00340-7 . .
