Patent ID: 7157176
Filing Date: 2007-01-02
Classification: B82Y,H01M,Y02E,Y02P

Abstract:
1. A process for producing a membrane-electrode assembly for a polymer electrolyte fuel cell comprising an anode and a cathode each having a catalyst layer, and an ion exchange membrane disposed between the anode and the cathode, wherein a step of producing at least one of the catalyst layer of the anode and the catalyst layer of the cathode, comprises a step of preparing a coating fluid containing an ion exchange polymer and a catalyst having catalytic metal particles dispersed on a carbon support, and a step of forming a catalyst layer by applying the coating fluid on a substrate, wherein the above coating fluid is prepared by using, as the above catalyst, a catalyst wherein the density of total functional groups of OH groups and CO groups at the surface is from 0.3 to 1.5×10 −3 (mmol/m 2 ), as obtained from the BET specific surface area and the total molar amount of OH groups and CO groups at the surface obtained by a titration method.