Membrane electrode assembly for use in electrochemical devices
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United States of America Patent
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Mar 12, 2013
Grant Date -
Sep 20, 2007
app pub date -
Jul 14, 2004
filing date -
Jul 14, 2003
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Abstract
The invention relates to a membrane-electrode assembly (MEA) for electrochemical devices, in particular for membrane fuel cells. The membrane-electrode assembly has a semi-coextensive design and comprises an ion-conducting membrane, two catalyst layers and gas diffusion layers of differing sizes on the front side and rear side. The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, while the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane. As a result, the ion-conducting membrane has a surface which is not supported by a gas diffusion layer on the front side.
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