Method for stabilizing polyelectrolyte membrane films used...

Details Method for stabilizing polyelectrolyte membrane films used... Method for stabilizing polyelectrolyte membrane films used...

2011-03-22

2011-03-22

Hodge, R. (Department: 1729)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Fuel cell with solid electrolyte

C429S413000, C429S494000, C427S115000

Reexamination Certificate

active

07910260

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.

REFERENCES:
patent: 2003/0104236 (2003-06-01), Nguyen et al.
patent: 546498 (1977-03-01), None
Official English Translation of SU 546498 (RU 546498).

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