Toyota Jidosha Kabushiki Kaisha

Katsutoshi Fujisawa

Hajime Hasegawa

Kazuyuki Nakanishi

Naoki Ueda

Takashi Iseki

Masafumi Koizumi

Yuka Yamada

Yasuhiro Ozawa

Hirohiko Hisano

A bipolar plate for a fuel cell comprises a substrate formed of stainless steel; an oriented amorphous carbon film formed at least on a surface of the substrate facing an electrode, and containing C as a main component, 3 to 20 at. % of N, and more than 0 at. % and not more than 20 at. % of H, and when the total amount of the C is taken as 100 at. %, the amount of C having an sphybrid orbital (Csp) being not less than 70 at. % and less than 100 at. %, and (002) planes of graphite being oriented along a thickness direction; a mixed layer generated in an interface between the substrate and the oriented amorphous carbon film and containing at least one kind of constituent atoms of each of the substrate and the oriented amorphous carbon film; and a plurality of projections protruding from the mixed layer into the oriented amorphous carbon film and having a mean length of 10 to 150 nm.

Bipolar plate for fuel cell and method for producing the same

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Toyota, Japan

Katsutoshi Fujisawa