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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

Masaki Kobayashi,abc   Shoichi Hidai,*ad   Hideharu Niwa,a   Yoshihisa Harada,abc   Masaharu Oshima,ab   Yuka Horikawa,c   Takashi Tokushima,c   Shik Shin,ce   Yoji Nakamorid  and  Tsutomu Aokid  
Author affiliations

* Corresponding authors

a Department of Applied Chemistry, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

b Synchrotron Radiation Research Organization, The University of Tokyo, 1-490-2 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5165, Japan

c RIKEN/SPring-8, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan

d Toshiba Fuel Cell Power Systems Corporation, 4-1 Ukishima-Cho, Kawasaki-ku, Kawasaki-Shi, Kanagawa 210-0862, Japan

e Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

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

https://doi.org/10.1039/B903818C
Submitted
23 Feb 2009
Accepted
28 May 2009
First published
29 Jun 2009
Phys. Chem. Chem. Phys., 2009,11, 8226-8230
Article type
Paper
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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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