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Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface

Authorized Users Only
1997
Authors
Grgur, Branimir
Zhuang, G
Marković, NM
Ross, PN
Contribution To Periodical (Published version)
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Abstract
The electrochemical oxidation of hydrogen in the presence of carbon monoxide (0.05-2%) on a well-characterized Pt75Mo25 alloy surface was examined using the rotating disk electrode technique in 0.5 M H2SO4 at 333 K. The surface composition of this alloy determined by low-energy ion scattering after sputter cleaning and annealing in UHV was essentially the same as the bulk. The shapes of the polarization curves are qualitatively similar to those for the Pt50Ru50 alloy examined previously: a high Tafel-slope (ca. 0.5 V/dec) region at low overpotential followed by a transition to a highly actively state where the current approaches the diffusion-limiting current; the potential where the transition to the active state occurs decreases with decreasing CO concentration, and the current in the low-overpotential region is roughly inverse half-order in the CO partial pressure. The magnitude of the current in the low-overpotential region on the Pt75Mo25 alloy is nearly the same as on the Pt50Ru5...0 alloy, but the potential for the transition to the active state is about 0.15 V higher. The magnitude of the current at 0.05-0.1 V with H-2 containing 100 ppm CO is sufficiently high that Pt-Mo alloy is of technical interest as an anode catalyst for low-temperature fuel cells fed with a reformed hydrocarbon fuel.

Source:
Journal of Physical Chemistry B, 1997, 101, 20, 3910-3913
Publisher:
  • Amer Chemical Soc, Washington

DOI: 10.1021/jp9704168

ISSN: 1089-5647

WoS: A1997WZ29000003

Scopus: 2-s2.0-4043157720
[ Google Scholar ]
151
143
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/137
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Grgur, Branimir
AU  - Zhuang, G
AU  - Marković, NM
AU  - Ross, PN
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/137
AB  - The electrochemical oxidation of hydrogen in the presence of carbon monoxide (0.05-2%) on a well-characterized Pt75Mo25 alloy surface was examined using the rotating disk electrode technique in 0.5 M H2SO4 at 333 K. The surface composition of this alloy determined by low-energy ion scattering after sputter cleaning and annealing in UHV was essentially the same as the bulk. The shapes of the polarization curves are qualitatively similar to those for the Pt50Ru50 alloy examined previously: a high Tafel-slope (ca. 0.5 V/dec) region at low overpotential followed by a transition to a highly actively state where the current approaches the diffusion-limiting current; the potential where the transition to the active state occurs decreases with decreasing CO concentration, and the current in the low-overpotential region is roughly inverse half-order in the CO partial pressure. The magnitude of the current in the low-overpotential region on the Pt75Mo25 alloy is nearly the same as on the Pt50Ru50 alloy, but the potential for the transition to the active state is about 0.15 V higher. The magnitude of the current at 0.05-0.1 V with H-2 containing 100 ppm CO is sufficiently high that Pt-Mo alloy is of technical interest as an anode catalyst for low-temperature fuel cells fed with a reformed hydrocarbon fuel.
PB  - Amer Chemical Soc, Washington
T2  - Journal of Physical Chemistry B
T1  - Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface
EP  - 3913
IS  - 20
SP  - 3910
VL  - 101
DO  - 10.1021/jp9704168
ER  - 
@article{
author = "Grgur, Branimir and Zhuang, G and Marković, NM and Ross, PN",
year = "1997",
abstract = "The electrochemical oxidation of hydrogen in the presence of carbon monoxide (0.05-2%) on a well-characterized Pt75Mo25 alloy surface was examined using the rotating disk electrode technique in 0.5 M H2SO4 at 333 K. The surface composition of this alloy determined by low-energy ion scattering after sputter cleaning and annealing in UHV was essentially the same as the bulk. The shapes of the polarization curves are qualitatively similar to those for the Pt50Ru50 alloy examined previously: a high Tafel-slope (ca. 0.5 V/dec) region at low overpotential followed by a transition to a highly actively state where the current approaches the diffusion-limiting current; the potential where the transition to the active state occurs decreases with decreasing CO concentration, and the current in the low-overpotential region is roughly inverse half-order in the CO partial pressure. The magnitude of the current in the low-overpotential region on the Pt75Mo25 alloy is nearly the same as on the Pt50Ru50 alloy, but the potential for the transition to the active state is about 0.15 V higher. The magnitude of the current at 0.05-0.1 V with H-2 containing 100 ppm CO is sufficiently high that Pt-Mo alloy is of technical interest as an anode catalyst for low-temperature fuel cells fed with a reformed hydrocarbon fuel.",
publisher = "Amer Chemical Soc, Washington",
journal = "Journal of Physical Chemistry B",
title = "Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface",
pages = "3913-3910",
number = "20",
volume = "101",
doi = "10.1021/jp9704168"
}
Grgur, B., Zhuang, G., Marković, N.,& Ross, P.. (1997). Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface. in Journal of Physical Chemistry B
Amer Chemical Soc, Washington., 101(20), 3910-3913.
https://doi.org/10.1021/jp9704168
Grgur B, Zhuang G, Marković N, Ross P. Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface. in Journal of Physical Chemistry B. 1997;101(20):3910-3913.
doi:10.1021/jp9704168 .
Grgur, Branimir, Zhuang, G, Marković, NM, Ross, PN, "Electrooxidation of H-2/CO mixtures on a well-characterized Pt75Mo25 alloy surface" in Journal of Physical Chemistry B, 101, no. 20 (1997):3910-3913,
https://doi.org/10.1021/jp9704168 . .

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