Membrane electrode assembly for an electrochemical fuel cell and

Details Membrane electrode assembly for an electrochemical fuel cell and Membrane electrode assembly for an electrochemical fuel cell and

1998-07-15

2000-05-02

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Having earth feature

429 40, 429 35, 429 34, 296231, 296232, H01M 486, H01M 600

Patent

active

060570547

ABSTRACT:
An improved membrane electrode assembly ("MEA") comprises coextensive ion exchange membrane and electrode layers and a resilient fluid impermeable integral seal made by impregnating a sealing material into the porous electrode layers in the sealing regions. The integral seal preferably circumscribes the electrochemically active area of the MEA. In addition, the integral seal preferably extends laterally beyond the edge of the MEA, enveloping the peripheral region including the side edge of the MEA. The uncured sealant material is preferably a flow processable elastomer that is applied to the MEA using a vacuum injection molding process. In preferred embodiments, the seal has a plurality of spaced, parallel raised ribs with cross-ribs extending therebetween at spaced intervals. The parallel raised ribs and cross-ribs provide compartmentalized seals that provide improved protection against fluid leaks.

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