Patent ID: 8778557

Claim:
A membrane electrode assembly for a fuel cell, comprising an anode, a cathode, and an electrolyte membrane disposed between the anode and the cathode, the anode including an anode catalyst layer laminated on one principal surface of the electrolyte membrane, and an anode diffusion layer laminated on the anode catalyst layer, the cathode including a cathode catalyst layer laminated on the other principal surface of the electrolyte membrane, and a cathode diffusion layer laminated on the cathode catalyst layer, at least one of the anode diffusion layer and the cathode diffusion layer including a conductive porous substrate, a porous composite layer laminated on the conductive porous substrate at a catalyst layer side, and a modified layer disposed on the porous composite layer at the catalyst layer side, the porous composite layer including a conductive carbon material, and a first water-repellent resin material, the modified layer including a second water-repellent resin material having a needle-like shape, and the second water-repellent resin material having a weight average molecular weight higher than that of the first water-repellent resin material.