Fuel cell

Details Fuel cell Fuel cell

2001-01-24

2008-03-25

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S047000, C429S047000

Reexamination Certificate

active

07348090

ABSTRACT:
A fuel cell comprises a cathode (electrode catalyst layer), an anode (electrode catalyst layer), and a gas diffusion layer provided at least on one of the cathode and anode between a collector and the electrode catalyst layer and containing carbon having an oil absorption larger than that of a catalyst-supporting carbon used in the electrode catalyst layers. As a result, the dropping of the cell voltage due to external factor is suppressed, even if the cell temperature is low (room temperature to 50° C.). The water-absorption pressure of the water passage in the gas diffusion layer is higher than those of the electrode catalyst layers. The produced water and moving water in the cathode is absorbed into the water passage in the gas diffusion layer exhausted to the collector side. When a cell temperature is low, the evaporation speed of water from the collectors is lowered. However, the produced water and moving water in the cathode are physically attracted on the basis of the water-absorbing pressure of the gas diffusion layer and discharged toward the collector side, so that the reduction of the cell voltage is prevented.

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Chinese Office Action dated Apr. 16, 2005 (English version).

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