A partially oxidized has been investigated as a new cathode for polymer electrolyte fuel cells. The catalytic activity for oxygen reduction reaction (ORR) significantly depended on an oxidation state of the . and had a poor catalytic activity for the ORR. The onset potential on the partially oxidized for the ORR had a maximum value of 0.9 V versus reversible hydrogen electrode in at , which indicated that the partially oxidized had definite catalytic activity for the ORR. Hard X-ray photoelectron spectroscopy and X-ray diffraction analyses revealed that the surfaces of the partially oxidized were oxidized, although the inner parts of the partially oxidized remained tantalum carbonitride. These results suggested that an appropriate oxidation of the was essential to enhance the catalytic activity for the ORR.
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June 2011
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Partially Oxidized Tantalum Carbonitride as New Cathodes Without Platinum Group Metals for Polymer Electrolyte Fuel Cell
Akimitsu Ishihara,
Akimitsu Ishihara
Chemical Energy Laboratory,
a-ishi@ynu.ac.jp
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
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Motoko Tamura,
Motoko Tamura
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
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Koichi Matsuzawa,
Koichi Matsuzawa
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
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Shigenori Mitsushima,
Shigenori Mitsushima
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
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Ken-ichiro Ota
Ken-ichiro Ota
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
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Akimitsu Ishihara
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japana-ishi@ynu.ac.jp
Motoko Tamura
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
Koichi Matsuzawa
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
Shigenori Mitsushima
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan
Ken-ichiro Ota
Chemical Energy Laboratory,
Yokohama National University
, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, JapanJ. Fuel Cell Sci. Technol. Jun 2011, 8(3): 031005 (6 pages)
Published Online: February 18, 2011
Article history
Received:
March 15, 2010
Revised:
July 15, 2010
Online:
February 18, 2011
Published:
February 18, 2011
Citation
Ishihara, A., Tamura, M., Matsuzawa, K., Mitsushima, S., and Ota, K. (February 18, 2011). "Partially Oxidized Tantalum Carbonitride as New Cathodes Without Platinum Group Metals for Polymer Electrolyte Fuel Cell." ASME. J. Fuel Cell Sci. Technol. June 2011; 8(3): 031005. https://doi.org/10.1115/1.4003161
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