Patent ID: 6020083
Filing Date: 2000-02-01
Classification: H01M,Y02E,Y02P

Abstract:
A membrane electrode assembly, comprising:a full planform proton exchange membrane having a central area on both sides thereof;catalyst layers disposed, respectively, on both sides of said full planform proton exchange membrane in a region over said central area;gas diffusion layers disposed, respectively, on sides of said catalyst layers not in communication with said full planform proton exchange membrane;porous substrates disposed, respectively, on sides of said gas diffusion layers not in communication with said catalyst layers; each of said porous substrates being impregnated at their periphery with a sealant; andsaid gas diffusion layers being coated with a sealant on respective sides thereof in regions which are in communication with sealant impregnated regions of said porous substrates; said gas diffusion layers and said porous substrates being co-extensive with said proton exchange membrane.