Shin-etsu Chemical Co., Ltd.

Hiroshi Matsukawa

Masaharu Takahashi

Toshio Ohba

Nobuo Kawada

Shigeru Konishi

Tomiyoshi Tsuchida

Disclosed is an electrolyte membrane-electrode assembly for direct methanol fuel cells, wherein a solid polymer electrolyte membrane is held between a pair of electrodes each composed of a catalyst layer coated over and/or impregnated in a porous supporting body. This electrolyte membrane-electrode assembly for direct methanol fuel cells is characterized in that the solid polymer electrolyte membrane is obtained by irradiating a resin membrane with radiation and graft-polymerizing a radically polymerizable monomer. The electrolyte membrane-electrode assembly for direct methanol fuel cells is further characterized in that the catalyst layer of the anode electrode comprises a catalyst, wherein platinum group metal or platinum-containing alloy particles having a particle size of 5 nm or less are supported by carbon particles, and a solid polymer electrolyte, and the noble metal amount in the catalyst layer of the anode electrode is not more than 5 mg/cm. By using such a catalyst, there can be obtained a direct methanol fuel cell wherein high output is achieved by using high methanol concentration.

Electrolyte membrane-electrode assembly for direct methanol fuel cell

A compound having a group --N.dbd.N-- is added to a conductive silicone rubber composition comprising an organopolysiloxane, conductive carbon black, and an organic peroxide. The composition allows for atmospheric hot air vulcanization with the aid of an organic peroxide irrespective of the inclusion of carbon black and is significantly improved in shelf stability. The conductive silicone rubber resulting therefrom is free of voids or surface tack and has improved heat resistance and conductivity.

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Annaka, Japan

Hiroshi Matsukawa