Patent ID: 8475974
Filing Date: 2013-07-02
Classification: H01M,Y02E

Abstract:
1. A membrane electrode assembly, comprising: an electrolyte membrane containing an ionomer; a plurality of first catalyst layers provided on one face of said electrolyte membrane; a plurality of second catalyst layers, provided on the other face of said electrolyte membrane, corresponding respectively to said plurality of first catalyst layer; and a first insulating layer provided on said electrolyte membrane between adjacent first catalyst layers, wherein: an end of said first insulating layer in an array direction of cells is disposed between said electrolyte membrane and said first catalyst layer, said first catalyst layer includes a first region positioned above the end of said first insulating layer in the array direction of cells and a second region in contact with said electrolyte membrane, the first region of said first catalyst layer includes a first ionomer, and the second region of said first catalyst layer includes a second ionomer, and the first ionomer included in the first region has a smaller number of C—F bonds than the second ionomer in the second region.