Membrane-electrode assembly for polymer electrolyte fuel...

Details Membrane-electrode assembly for polymer electrolyte fuel... Membrane-electrode assembly for polymer electrolyte fuel...

2007-01-02

2007-01-02

Alejandro, Raymond (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having earth feature

C429S047000, C502S101000, C427S115000

Reexamination Certificate

active

11315016

ABSTRACT:
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 them, and the membrane-electrode assembly so produced, wherein at least one of the catalyst layers is produced by preparing a coating fluid containing an ion exchange polymer and a catalyst having catalytic metal particles dispersed on a carbon support, and a catalyst layer is formed by applying the coating fluid on a substrate, wherein the catalyst has a density of total functional groups of OH groups and CO groups at the surface is at most 1.6×10−3(mmol/m2), 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.

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