Membrane electrode assemblies for electrochemical cells
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United States of America Patent
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Aug 5, 2003
Grant Date -
N/A
app pub date -
Mar 13, 2001
filing date -
Mar 14, 2000
priority date (Note) -
Expired
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Abstract
Membrane electrode assemblies (MEA) comprise an asymmetric membrane composite, a cathode and an anode in eleetneal contact with the composite to form solid polymer electrolytes+ The a.symmetñc membrane composites corn-price a thin, continuous, non-pomus, but water and proton permeable polymeric film layer, an adjacent thicker stratum or layer consisting of a porous support backing and a catalyst impregliated mainly in the poroms support region. The catalyst may be one, for example, that is suitable for the oxidation of unreacted alcohol. The MEAs may be employed in both energy producing electrochemical cells, e.g. fuel cells and energy consuming electrochemical cells for the synthesis of chemicals+ The MEAS may be adapted for direct feed methanol fuel cells and are especially useful in eliminating crossover of unreacted methanol to the cathode and ?unwanted voltage reduction.
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