Honda Motor Co., Ltd.
Method of forming gas diffusion layer on carbon paper used in fuel cells and carbon paper having gas diffusion layer formed thereon used in fuel cells

Abstract:

Provided are a method of forming a gas diffusion layer on carbon paper, the method being capable of balancing smoothness with air permeability and water drainage ability in the gas diffusion layer as an underlayer, as well as the carbon paper having the gas diffusion layer formed thereon used in fuel cells. The method of forming a gas diffusion layer (L2) on carbon paper (CP) used in fuel cells includes the steps of: forming a water-repellent layer (L1) on the surface of the carbon paper (CP), forming a crack (CR) in the water-repellent layer (L1), and forming the gas diffusion layer (L2) on the water-repellent layer (L1) having the crack (CR) formed therein.