Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1997-02-24
1999-09-14
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 41, 429 42, H01M 200
Patent
active
059521198
ABSTRACT:
A polymer electrolyte membrane fuel cell assembly has an anode side and a cathode side separated by the membrane and generating electrical current by electrochemical reactions between a fuel gas and an oxidant. The anode side comprises a hydrophobic gas diffusion backing contacting one side of the membrane and having hydrophilic areas therein for providing liquid water directly to the one side of the membrane through the hydrophilic areas of the gas diffusion backing. In a preferred embodiment, the hydrophilic areas of the gas diffusion backing are formed by sewing a hydrophilic thread through the backing. Liquid water is distributed over the gas diffusion backing in distribution channels that are separate from the fuel distribution channels.
REFERENCES:
patent: 3905832 (1975-09-01), Trocciola
patent: 4818637 (1989-04-01), Molter et al.
patent: 4876115 (1989-10-01), Raistrick
patent: 5211984 (1993-05-01), Wilson
patent: 5234776 (1993-08-01), Koseki
patent: 5234777 (1993-08-01), Wilson
patent: 5618392 (1997-04-01), Furuya
patent: 5641586 (1997-06-01), Wilson
M. Watanabe et al., "Management of the Water Content in Polymer Electrolyte Membranes with Prorous Fiber Wicks," 140 J. Electrochem. Soc., No. 11, pp. 3190-3193 (Nov. 1993).
Nuzzolillo Maria
Regents of the University of California
Weiner Laura
Wilson Ray G.
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