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Issue 37, 2009
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Co oxidation accompanied by degradation of Pt–Co alloy cathode catalysts in polymer electrolyte fuel cells

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Abstract

The electronic structure of Co ions in Pt3Co alloy cathode catalysts for polymer electrolyte fuel cells (PEFCs) under different operation conditions has been investigated using X-ray absorption spectroscopy (XAS). The line shapes of the Co 2p XAS spectra indicate that the Co atoms in the cathode layer are predominantly metallic in all cells, and the spectrum of the first-operated cell is the most metallic among them. The Co 2p XAS spectra slightly change depending on the operation conditions, and the differences in the spectra can be explained by the presence of cobalt oxides. Decomposition analysis of the Co 2p XAS spectra reveals that the operation of Pt–Co PEFCs yields trivalently oxidised cobalt in the cathode layer.

Graphical abstract: Co oxidation accompanied by degradation of Pt–Co alloy cathode catalysts in polymer electrolyte fuel cells

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Article information


Submitted
23 Feb 2009
Accepted
28 May 2009
First published
29 Jun 2009

Phys. Chem. Chem. Phys., 2009,11, 8226-8230
Article type
Paper

Co oxidation accompanied by degradation of Pt–Co alloy cathode catalysts in polymer electrolyte fuel cells

M. Kobayashi, S. Hidai, H. Niwa, Y. Harada, M. Oshima, Y. Horikawa, T. Tokushima, S. Shin, Y. Nakamori and T. Aoki, Phys. Chem. Chem. Phys., 2009, 11, 8226
DOI: 10.1039/B903818C

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