Patent ID: 7687187

Claim:
A polymer electrolyte fuel cell comprising plural units, a unit comprising: an anode side separator; an anode diffusion layer; an anode catalytic layer; a polymer electrolyte membrane; a cathode catalytic layer; a cathode diffusion layer; and a cathode side separator, the cathode catalytic layer comprising: a catalyst in which platinum or platinum alloy is supported on a carbon supporting body having an average lattice space d002 of [002] surface of 0.338 to 0.355 nm and specific surface area of the supporting body of 80 to 250 m 2 /g; electrolyte containing ion exchange resin; and vapor grown carbon fiber, wherein a water holding layer containing ion exchange resin, carbon particles, and vapor grown carbon fiber is arranged at an interface of the cathode diffusion layer and the cathode catalytic layer and at an interface of the anode diffusion layer and the anode catalytic layer.