Membrane Electrode Assemblies and Highly Durable Fuel Cells
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United States of America Patent
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Issued Date -
Dec 6, 2007
app pub date -
Jul 21, 2005
filing date -
Jul 21, 2004
priority date (Note) -
Abandoned
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Abstract
The invention relates to a membrane electrode assembly which comprises two gas diffusion layers, each contacted with a catalyst layer, which are separated by a polymer-electrolyte membrane. Said polymer electrolyte membrane has an inner area which is contacted with a catalyst layer, and an outer area which is not provided on the surface of a gas diffusion layer. The inventive assembly is characterized in that the thickness of all components of the outer area is 50 to 100%, based on the thickness of all components of the inner area. The thickness of the outer area decreases over a period of 5 hours by not more than 5% at a temperature of 80.degree. C. and a pressure of 5 N/mm.sup.2. The decrease in thickness is determined after a first compression step which takes place over a period of 1 minute at a pressure of 5 N/mm.sup.2.
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