GAS DIFFUSION LAYER AND FUEL CELL USING SAME

摘要

A gas diffusion layer having a favorable micro-short resistance and a favorable flooding resistance characteristic realized by optimizing the surface shape of the gas diffusion layer. The gas diffusion layer having an electron conductivity and a gas diffusivity is used for a gas diffusion electrode having at least a catalyst layer containing an electrode catalyst and the gas diffusion layer. A second surface opposite to the first surface provided on the catalyst layer side is rougher than the first surface. The maximum height Ry1 of the surface roughness of the first surface measured by the measuring method prescribed in JIS B 0601 is 10 to 50, and the maximum height Ry2 of that of the second surface measured by the measuring method prescribed in JIS B 0601 is 100 to 500.