METHOD OF MAKING A MEMBRANE ELECTRODE ASSEMBLY COMPRISING A VAPOR BARRIER LAYER, A GAS DIFFUSION LAYER, OR BOTH
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Nov 16, 2006
filing date -
Nov 16, 2005
priority date (Note) -
Abandoned
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Abstract
Methods of producing an electrochemical conversion assembly comprising an electrochemical conversion cell are provided. The electrochemical conversion cells which comprises a membrane electrode assembly, first and second flowfield portions defined on opposite sides of the membrane electrode assembly, and, at least one vapor barrier layer disposed between the membrane electrode assembly and at least one of the flowfield portions. The method further includes selecting a desired mass transfer coefficient MTC for the at least one vapor barrier layer of at least about 0.05 cm and optimizing one or more of the porosity, the tortuosity, and the thickness of the vapor barrier layer to produce the desired MTC in the vapor barrier layer.
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