Membrane electrode assembly, fuel cell using same and process for producing them

摘要

It is an object of this invention to provide a high-performance membrane electrode assembly high in adhesiveness to proton-conductive aromatic polymer membrane, low in interfacial resistance and high in voltage-current performance, and a fuel cell using the same. This invention consists in a membrane electrode assembly equipped with an anode electrode having a catalyst layer on one side surface of a proton-conductive aromatic polymer membrane and a cathode electrode on the other side surface of the membrane, wherein said catalyst layer has a catalyst and a pi-conjugated aromatic polymer having ion exchanging groups on side chains thereof.