초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] An improved membrane electrode assembly for an electrochemical fuel cell, said membrane electrode assembly comprising:a first porous electrode layer;a second porous electrode layer;an ion exchange membrane interposed between said first and second porous electrode layers w

[ What is claimed is:] [1.] An improved membrane electrode assembly for an electrochemical fuel cell, said membrane electrode assembly comprising:a first porous electrode layer;a second porous electrode layer;an ion exchange membrane interposed between said first and second porous electrode layers wherein said first and second electrode layers and said membrane are coextensive;an electrocatalyst disposed at the interface between said ion exchange membrane and said first and second porous electrode layers, said electrocatalyst defining an electrochemically active area; anda resilient fluid impermeable integral seal which is integral with said membrane electrode assembly wherein said integral seal comprises a fluid impermeable electrically insulating sealant material impregnated into said first and second porous electrode layers in sealing regions thereof, wherein said integral seal extends laterally beyond said membrane and said electrode layers, thereby enveloping a peripheral region of both of said first and second electrodes and said ion exchange membrane.