Thin film MEA structures for fuel cell and method for fabrication
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United States of America Patent
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Feb 10, 2015
Grant Date -
May 6, 2010
app pub date -
Oct 28, 2009
filing date -
Nov 4, 2008
priority date (Note) -
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Abstract
The current invention provides a fabrication method for large surface area, pinhole-free, ultra thin ion conducting membranes using atomic layer deposition on inexpensive sacrificial substrates to make cost effective, high performance fuel cells or electrolyzers. The resultant membrane electrode assembly (MEA) enables significant reduction in resistive losses as well as lowering of the operating temperature of the fuel cell. The invention further provides a method to deposit 3-dimensional surface conformal films that may have compositional grading for superior performance. In addition, the invention provides decoration and modification of electrode surfaces for enhanced catalytic activity and reduced polarization losses. The method of the current invention enables the MEA structure to be fabricated from the anode side up or the cathode side up, each with or without an incorporated anode current collector or cathode current collector, respectively.
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