Gas diffusion electrode substrate, method for producing the same, gas diffusion electrode, membrane electrode assembly, and polymer electrolyte fuel cell

摘要

An object of the present invention is to improve drainage performance in a gas diffusion electrode made of a carbon fiber non-woven fabric. The present invention is a gas diffusion electrode substrate consisting essentially of a carbon fiber non-woven fabric, wherein the carbon fiber non-woven fabric has a high basis weight area having a relatively high basis weight and a low basis weight having a relatively low basis weight in the plane. A gas diffusion electrode base having an areal pattern in which regions are disposed, and a concavo-convex pattern in which a recess and a convex are disposed on at least one surface, wherein the concavo-convex pattern is formed independently of the areal pattern. It is a material.