Surface oxidation of carbon supports due to potential cycling under PEM fuel cell conditions

The corrosive operating conditions of a PEM fuel cell causes significant oxidation of its carbon supports, thus severely affecting the fuel cell performance and lifetime. PEM fuel cells in transportation or automobile applications typically experience potential cycling due to start-up/shutdown cycle...

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Bibliographic Details
Published in:Electrochimica acta 2010-06, Vol.55 (16), p.4765-4771
Main Authors: Avasarala, Bharat, Moore, Richard, Haldar, Pradeep
Format: Article
Language:English
Subjects:
Carbon
Carbon corrosion
Catalyst support
Cycles
Deterioration
Electrochemical oxidation
Fuel cells
Oxidation
Proton exchange membrane fuel cells
Shutdowns
Transportation
X-rays
XPS
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Summary:The corrosive operating conditions of a PEM fuel cell causes significant oxidation of its carbon supports, thus severely affecting the fuel cell performance and lifetime. PEM fuel cells in transportation or automobile applications typically experience potential cycling due to start-up/shutdown cycles or varying loads further deteriorating the long-term performance of a fuel cell. Here we report that the rate of surface oxidation of carbon supports significantly increases during potential cycling making the carbon support prone to further oxidation. Using X-ray photoelectron spectroscopy, we identify the various carbon–oxygen groups formed on the surface of carbon support due to potential cycling and compare them with those treated under potential hold conditions. Interestingly, these surface groups vary in proportion from those formed on carbon support during idle potential conditions reported in the literature.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2010.03.056