Membrane-electrode assembly for solid polymer electrolyte fuel cell

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—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)1— (1 is an integer of 1 to 10), —(CH2)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;
• R1 to R16, 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.