Mitsui Minings & Melting Co., Ltd.

Kenichi Amitani

Susumu Takahashi

Naohiko Abe

Ryoma Tsukuda

Yoshihiro Yoneda

Hiroki Takahashi

Akiko Sugimoto

Koichi Miyake

Kazuhiko Kato

Hiromu Watanabe

Koji Taniguchi

Hiromu Watanbe

In this fuel cell electrode catalyst layer, a catalyst is supported on a carrier comprising inorganic oxide particles. The fuel cell electrode catalyst layer is provided with a porous structure. When a mercury penetration method is used to measure the pore size distribution of the porous structure, a peak is observed in the range spanning from 0.005 &#x3bc;m to 0.1 &#x3bc;m inclusive, and a peak is also observed in the range spanning from over 0.1 &#x3bc;m to not more than 1 &#x3bc;m. When P1 represents the peak intensity in the range spanning from 0.005 &#x3bc;m to 0.1 &#x3bc;m inclusive, and P2 represents the peak intensity in the range spanning from over 0.1 &#x3bc;m to not more than 1 &#x3bc;m, the value of P2/P1 is 0.2-10 inclusive. It is preferable that the inorganic oxide be tin oxide.

Fuel cell electrode catalyst layer, production method therefor, membrane electrode assembly, and solid polymer fuel cell

Disclosed is a tin oxide containing antimony and at least one element A selected from the group consisting of tantalum, tungsten, niobium, and bismuth. The antimony and the at least one element A selected from the group consisting of tantalum, tungsten, niobium, and bismuth are preferably dissolved in a solid state in tin oxide. The ratio of the number of moles of the element A to the number of moles of antimony, i.e., [(the number of moles of the element A/the number of moles of antimony)], is preferably 0.1 to 10.

Tin oxide, electrode catalyst for fuel cells, membrane electrode assembly, and solid polymer fuel cell

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Saitama, Japan

Kenichi Amitani