Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer or spacer insulating structure
Patent
1994-10-14
1996-05-28
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer or spacer insulating structure
427115, 502101, H01M 404
Patent
active
055210201
ABSTRACT:
A method for catalyzing a gas diffusion electrode (GDE) with a catalytic material mixed with a solubilized electrolyte, where the electrolyte preferably comprises a perfluorocarbon sulfonic acid copolymer. The catalytic material and solubilized electrolyte are mixed to form a paste or the slurry, which is then applied layer by layer onto the catalyzable side of the GDE while the electrode is kept on a hot plate at a temperature of approximately 80.degree.-100.degree. C. The electrode and the catalyst layers are then dried in an oven at a temperature of about 100.degree. C. for about 10 minutes. The catalytic material preferably comprises a metal, such as platinum, and is further mixed with a supporting material comprising a high surface area carbon, resulting in a platinum-on-carbon mixture. A method according to the present invention avoids exposure of the high surface area catalytic material to the high temperatures of the conventional method, thereby keeping the maximum surface area of the catalyst available for the electrochemical reaction. Such gas diffusion electrodes are preferably used in operation of proton exchange membrane fuel cells without external humidification.
REFERENCES:
patent: 3405010 (1968-10-01), Kordesch et al.
patent: 3779812 (1973-12-01), Witherspoon et al.
patent: 3979227 (1976-09-01), Katz et al.
patent: 4141801 (1979-02-01), Perry
patent: 4248682 (1981-02-01), Lindstrom et al.
patent: 4541905 (1985-09-01), Kuwana et al.
patent: 4610938 (1986-09-01), Appleby
patent: 4661411 (1987-04-01), Martin et al.
patent: 4876115 (1989-10-01), Raistrick
patent: 5084144 (1992-01-01), Reddy et al.
patent: 5085743 (1992-02-01), Reddy et al.
patent: 5211984 (1993-05-01), Wilson
patent: 5242764 (1993-09-01), Dhar
patent: 5318863 (1994-06-01), Dhar
Wilson, M. S. and Gottesfeld, S.; "High Performance Catalyzed Membranes of Ultra-low Pt Loadings for Polymer Electrolyte Fuel Cells"; J. Electrochem. Soc., vol. 139, No. 2, pp. L28-L30; Feb. 1992.
BCS Technology, Inc.
Kalafut Stephen
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