Patent ID: 8361673
Filing Date: 2013-01-29
Classification: H01M,Y02E,Y02P

Abstract:
1. A fuel cell, comprising: a polymer electrolyte membrane having a catalyst layer, a gas diffusion layer, and a separator stacked in order on each of both surfaces of the polymer electrolyte membrane, wherein the gas diffusion layer provided at least on one surface side of the polymer electrolyte membrane is structured with a conductive carbon sheet, fluid flow passages being formed on a surface of the gas diffusion layer contacting on the separator, and a roughness of the surface of the gas diffusion layer having the fluid flow passage formed is smaller than a roughness of a surface of the gas diffusion layer contacting on the catalyst layer, wherein at least one of the gas diffusion layers has a rib portion positioned between adjacent fluid flow passages, and wherein a difference in an arithmetic mean deviation of roughness profile between the surface of the gas diffusion layer contacting the separator and the surface of the gas diffusion layer contacting the catalyst layer is at least 1.0 μm and not more than 4.95 μm.