KETEP 세계에너지시장정보

A gas diffusion layer for a fuel cell, wherein the gas diffusion layer comprises:a) planar conductive fiber material, andb) a microporous layer on one of the surfaces of the fibrous material,where the gas diffusion layer has at least one characteristic gradient with respect to its base surface in the x,y plane with respect to at least one chemical and/or physical property,wherein the microporous layer has at least one characteristic gradient,wherein the microporous layer has at least two transversely adjacent bands that differ in at least one characteristic,And the total porosity of the gas diffusion layer therein is in the range of 20% to 80%, and based on the total volume of the pores in the finished microporous layer, the proportion of pores in the finished microporous layer due to the use of a pore-forming agent is 0 to 70 percent by volume.