Patent ID: 7887969

Claim:
A membrane electrode assembly for solid polymer electrolyte fuel cells, comprising: an anode electrode, a cathode electrode, and a solid polymer electrolyte membrane, the anode electrode and the cathode electrode are disposed on opposite sides of the solid polymer electrolyte membrane, wherein the solid polymer electrolyte membrane has a nitrogen atom and a sulfonic acid group, and a constitutional unit in which a principal chain is a phenylene bond, wherein the solid polymer electrolyte membrane includes a sulfonated polyarylene having a constitutional unit expressed by the general formula (1) below: in which, Z represents a sulfur atom, oxygen atom, and —NH— group; R represents at least one atom or group selected from a hydrogen atom, fluorine atom, alkyl group, partly or fully halogenated alkyl group, allyl group, aryl group, nitro group and nitrile group, which may be identical or different from each other; and j and k are integers of 1 to 4 and wherein the solid polymer electrolyte membrane includes a sulfonated polyarylene further having a constitutional unit expressed by the general formula (2): in which A and D each represent at least one structure selected independently from the group consisting of: a direct bond, —CO—, —SO 2 —, —SO—, —CONH—, —COO—, —(CF 2 ) 1 — (1 is an integer of 1 to 10), —(CH 2 ) 1 — (1 is an integer of 1 to 10), —CR′ 2 — (R′ is an aliphatic hydrocarbon group, aromatic hydrocarbon group, halogenated hydrocarbon group) cyclohexylidene group, fluorenylidene group, —O—, or —S—; B is independently an oxygen or sulfur atom; R 1 to R 16 , which may be identical or different from each other, represent at least one atom or group selected from a hydrogen atom, fluorine atom, alkyl group, partly or fully halogenated alkyl group, allyl group, aryl group, nitro group and nitrile group; s and t are integers of 0 to 4; and r is an integer of 0 or more than 1.