GAS DIFFUSION LAYER FOR POLYMER ELECTROLYTE FUEL CELL AND ELECTROLYTE MEMBRANE/ELECTRODE JOINT BODY AS WELL AS POLYMER ELECTROLYTE FUEL CELL

摘要

PROBLEM TO BE SOLVED: To realize a polymer electrolyte fuel cell capable of a stable operation for long period of time through supply of a gas diffusion layer or a gas diffusion electrode with improved basic functions as a cell, enabling a uniform moisture control over the whole surface of an electrolyte membrane/electrode joint body (MEA).

SOLUTION: A gas diffusion layer 213a having a polymer-containing conductive layer 22a consisting of conductive carbon particles 210a, 211a with different volume of acid functional group and a polymer material 212a is formed on a porous support body 21a. On the surface of the gas diffusion layer 213a, a catalyst layer 23a containing conductive carbon particles holding platinum is arranged to structure a gas diffusion electrode 24a. Mixing volume of the conductive carbon particles 211a with a plenty of acid functional group volume is increased from one end (R2) of the gas diffusion electrode 24a toward the other end (L2).

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