Chemistry: electrical current producing apparatus – product – and – Having earth feature
Reexamination Certificate
2005-06-28
2005-06-28
Kalafut, Stephen J. (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Having earth feature
C429S047000, C502S101000, C502S104000, C502S326000
Reexamination Certificate
active
06911278
ABSTRACT:
An electrode catalyst for a fuel cell includes a conductive support, and catalytic particles loaded on the conductive support. The catalytic particles include platinum and a base metal being on the lower end of the electrochemical series with respect to platinum. The number of the atoms of the base metal, forming metallic oxides without alloying with the platinum, is less than 5 atomic % of the number of the atoms of the platinum on a surface of the catalytic particles. The electrode catalyst is produced by loading the platinum and base metal on the conductive support, alloying the platinum and base metal thereon by a heat treatment, thereby making the catalytic particles, and removing metallic oxides from a surface of the catalytic particles. The electrode catalyst is less expensive comparatively, exhibits high catalytic activities, and hardly lowers the battery performance of fuel cells.
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English Translation of JP 6-176,766 (Jun. 1994) Watanabe et al.
English Translation of JP 6-246,160 (Sep. 1994) Nakamura et al.
English Translation of JP 9-206,597 (Aug. 1997) Yamamoto et al.
English Translation of JP 2001-68,120 (Mar. 2001) Hiroshima et al.
English Abstract for JP 4-371,230 (Dec. 1992) Enomoto et al.
Asaoka Takahiko
Hiroshima Kazutaka
Kato Hisao
Nagami Tetsuo
Noritake Tatsuo
Kalafut Stephen J.
Toyota Jidosha & Kabushiki Kaisha
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