| abstract |
A membrane-electrode assembly and a direct methanol fuel cell that can be operated with a high-concentration aqueous methanol solution are provided. A membrane-electrode assembly for a direct methanol fuel cell comprising an aromatic ion exchange resin membrane, a catalyst layer containing at least a catalyst-supporting carbon and an ion exchange resin electrolyte, and a gas diffusion layer, The aromatic ion exchange resin membrane is a polyarylene polymer having a sulfonic acid group containing a structural unit represented by the following general formula (A) and a structural unit represented by the general formula (B), on the cathode side the catalyst layer includes a platinum catalyst, coated amount of platinum catalyst 0.7 mg / cm 2 or more 6.0 mg / cm 2 or less is a direct methanol fuel cell membrane of - electrode assembly. [A and D are a direct bond, —O—, —S—, etc., B represents an oxygen atom or a sulfur atom, Ph represents a condensed aromatic ring, and R 1 to R 20 represent a hydrogen atom or a fluorine atom. And an alkyl group. Y is —CO—, —SO 2 — or the like. ] [Selection figure] None |