Membrane electrode assembly with modified catalyst layout

Details Membrane electrode assembly with modified catalyst layout Membrane electrode assembly with modified catalyst layout

2004-09-24

2009-08-04

Yuan, Dah-Wei D (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having earth feature

C429S006000, C429S006000, C429S047000

Reexamination Certificate

active

07569303

ABSTRACT:
An electrochemical cell assembly includes first and second flow field plates, first and second gas diffusion media disposed between the first and second flow field plates, and a membrane electrode assembly disposed between the first and second gas diffusion media. The membrane electrode assembly can include a proton exchange membrane, and a catalyst layer on the proton exchange membrane. The catalyst layout can be configured to omit the catalyst layer from a portion of the proton exchange membrane adjacent an edge region of one of the first and second gas diffusion media, thereby enabling at least a portion of the reactant fluid flow to first encounter a region of the membrane electrode assembly without the catalyst layer. The modified catalyst layout can improve reactant fluid flow along the membrane electrode assembly, reduce wear on the membrane electrode assembly and improve electrochemical cell efficiency during operation.

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