Gas diffusion layer for solid polymer electrolyte fuel cell

Details Gas diffusion layer for solid polymer electrolyte fuel cell Gas diffusion layer for solid polymer electrolyte fuel cell

1998-03-17

2000-10-03

Bell, Bruce F.

Chemistry: electrical current producing apparatus, product, and

Having earth feature

429 41, 429 42, 429 44, 204283, 204290R, 204294, 204296, H01M 486

Patent

active

061270598

ABSTRACT:
A gas diffusion layer for a solid polymer electrolyte fuel cell having a solid polymer electrolyte and a catalyst layer disposed adjacent to the solid polymer electrolyte, where the gas diffusion layer includes a carbon fiber woven cloth having a surface and a coating of a fluororesin (such as polytetrafluoroethylene) containing carbon black on the surface, wherein the carbon fiber woven cloth is adapted to be disposed in the solid polymer electrolyte fuel cell such that the coating is adjacent to the catalyst layer in the solid polymer electrolyte fuel cell. Preferably, the coating penetrates no more than one-half the thickness of the carbon fiber woven cloth. Most preferably, the coating penetrates no more than one-third the thickness of the carbon fiber woven cloth. The carbon fiber woven cloth may be pre-treated with a water-repellent fluororesin (such as polytetrafluoroethylene), or with a mixture of a fluororesin and carbon black, to enhance water repellency. In another aspect, the invention provides a solid polymer electrolyte fuel cell including a solid polymer electrolyte having first and second surfaces, a catalyst layer disposed on each of the first and second surfaces, and the gas diffusion layer of this invention disposed adjacent to said catalyst layer disposed on each of the first and second surfaces.

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T. E. Springer, M. s. Wilson, S. Gottesfeld, "Modeling and Experimental Diagnostics in Polymer Electrolyte Fuel Cells"; J. Electrochem. Soc., vol. 140, No. 12, Dec. 1993, pp. 3513-3525.
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Mosdale et al., "High Performance Electroldes for Hydrogen/Air PEMFC Operating at Atmostpheric Pressure", Electrochemical Society Proceedings, vol. 95-23, pp. 48-56. No Month/Year Available.

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