Hydrogen oxidation on ordered intermetallic electrodes covered with CO

This describes an experimental evaluation of the electrocatalytic activity of the hydrogen oxidation reaction on electrodes of platinum and the ordered intermetallic phases PtSb and PtSn, on which CO has previously been deposited. The experiments were carried out in perchloric acid solution and the...

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Bibliographic Details
Published in:Journal of power sources 2008-01, Vol.175 (2), p.779-783
Main Authors: Innocente, A.F., Ângelo, A.C.D.
Format: Article
Language:English
Subjects:
Applied sciences
CO adsorption
Electrocatalysis
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Hydrogen oxidation
Ordered intermetallic materials
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Summary:This describes an experimental evaluation of the electrocatalytic activity of the hydrogen oxidation reaction on electrodes of platinum and the ordered intermetallic phases PtSb and PtSn, on which CO has previously been deposited. The experiments were carried out in perchloric acid solution and the analysis based on steady-state polarization curves and Tafel plots derived from chronoamperometric data. Both intermetallics, PtSb and PtSn, performed better than Pt towards the HOR, when their surface was deliberately covered with CO. It is suggested that the intermetallic surfaces have a lower affinity for CO molecules, causing a lower CO coverage on these surfaces, and/or a weaker surface–CO interaction, compared to Pt under the same conditions.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2007.10.001