Method for stabilizing polyelectrolyte membrane films used in fuel cells
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United States of America Patent
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Apr 30, 2013
Grant Date -
May 10, 2012
app pub date -
Jan 27, 2011
filing date -
Nov 1, 2004
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Abstract
A novel method of altering extruded membrane films for PEM (polymer electrolyte membrane) fuel cells in such a manner that the membrane films swell substantially uniformly in both the in-plane x and y directions when immersed in water or ionomer solution is disclosed. The invention includes cutting a membrane film from an extruded membrane sheet in a diagonal orientation with respect to the membrane process direction of the membrane sheet. The membrane film exhibits reduced internal stress as compared to conventionally-prepared membrane films and allows a more even distribution of pressure in a fuel cell stack, thereby reducing the incidence of swollen membrane-induced failure mechanisms in the fuel cell stack.
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