Flow field assembly for electrochemical fuel cells

Details Flow field assembly for electrochemical fuel cells Flow field assembly for electrochemical fuel cells

1995-08-31

1997-04-15

Nuzzolillo, M.

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 41, 429 42, H01M 810

Patent

active

056208073

ABSTRACT:
An electrochemical fuel cell having a membrane electrode assembly and a layer of an electrically conductive porous material adjacent thereto which has at least two portions with different mean pore sizes, wherein a first portion of the layer adjacent to the membrane electrode assembly has a porosity no greater than a second portion of the layer adjacent to the opposite side of the layer; the second portion has a porosity of at least about 82 percent; and the second portion has an mean pore size which is at least about 10 microns and at least ten times greater than the mean pore size of the first portion.

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