Mitsui Minings & Melting Co., Ltd.

Hiromu Watanbe

Susumu Takahashi

Yoshihiro Yoneda

Hiroki Takahashi

Naohiko Abe

Koichi Miyake

Kazuhiko Kato

Ryoma Tsukuda

Koji Taniguchi

Kenichi Amitani

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

Hiromu Watanbe