POLYMER ELECTROLYTE MEMBRANE, ITS MANUFACTURING METHOD, AND MEMBRANE ELECTRODE ASSEMBLY AS WELL AS SOLID POLYMER FUEL CELL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a protonic conductive film for a solid polymer fuel cell with high hydrogen peroxide and radical resistance, high initial output voltage, and capable of obtaining high output voltage over a long period of time.

SOLUTION: The polymer electrolyte membrane contains (A) a polyarylene system copolymer with a sulfonic acid group, and (B) manganese-content oxide with a specific surface area of 55 m2/g or less measured in the BET method. The (B) manganese-content oxide is at least one of the complex oxides containing manganese oxide or at least one element out of Mn, Ni, Bi, and Ce, and further, (B) the manganese-content oxide is at least either the complex oxide containing MnO2, Mn2O3, Mn, and Bi or that containing Mn and Ni.

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