Membrane electrode assembly prepared by direct spray of catalyst to membrane
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United States of America Patent
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Jun 7, 2011
Grant Date -
Jul 28, 2005
app pub date -
Jan 22, 2004
filing date -
Jan 22, 2004
priority date (Note) -
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Abstract
A technique for fabricating an MEA. The technique includes providing a polymer electrolyte proton conducting membrane, and then spraying a catalyst ink directly on the membrane to form a catalyst layer. In one embodiment, the catalyst ink includes the proper ionomer to carbon ratio, such as 0.8/1, for the desired fuel cell performance. In another embodiment, the catalyst ink includes too little ionomer for the proper ionomer to carbon ratio for the desired fuel cell performance. An ionomer layer is sprayed on the membrane before the catalyst layer to provide the proper final ionomer to carbon ratio.
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