Gas diffusion electrodes based on poly(vinylidene fluoride) carb

Details Gas diffusion electrodes based on poly(vinylidene fluoride) carb Gas diffusion electrodes based on poly(vinylidene fluoride) carb

1996-08-27

1998-07-21

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Having earth feature

427115, 502101, H01M 488

Patent

active

057833257

ABSTRACT:
All electrocatalytic gas diffusion electrode for fuel cells and a process for its preparation is disclosed. The electrode comprises an anistropic gas diffusion layer and a catalytic layer. The gas diffusion layer is made of a porous carbon matrix through which carbon particles and poly(vinylidene) fluoride are distributed so that the matrix is homogeneously porous in a direction lateral to gas flow and asymmetrically porous to gases in the direction of the gas flow. The porosity of the gas diffusion layer decreases in the direction of gas flow. The catalytic layer is made of a coagulated ink suspension containing catalytic carbon particles and a thermoplastic polymer selected from polyethersulfone, poly(vinylidene fluoride) and sulfonated polysulfone and covers the small pore surface of the gas diffusion layer. The gas diffusion layer has a thickness between 50 .mu.m and 300 .mu.m. The catalytic layer has thickness between 7 .mu.m and 50 .mu.m and a metal catalyst loading between 0.2 mg/cm.sup.2 and 0.5 mg/cm.sup.2.

REFERENCES:
patent: 3671317 (1972-06-01), Rifkin
patent: 3899354 (1975-08-01), Kordesch
patent: 3912538 (1975-10-01), Dews et al.
patent: 4401519 (1983-08-01), Kadija et al.
patent: 4440617 (1984-04-01), Solomon
patent: 4444852 (1984-04-01), Liu et al.
patent: 4461814 (1984-07-01), Klinedinst
patent: 4826742 (1989-05-01), Reiser
patent: 4847173 (1989-07-01), Mistunaga et al.
patent: 5547911 (1996-08-01), Grot
Proceedings, Int. Power Source Symposium, 1990, "A Polymer Chemist's View on Fuel Cell Electrods" by J. Manassen and I. Cabasso (month unknown).
J. Applied Electrochemistry, 22 (1992), "Thin-film catalyst layers for polymer electrolyte fuel cell electrodes" by M.S. Wilson and S. Gottesfeld (month unknown).
Encylopedia Polymer Science and Engineering, 2nd Ed., John Wiley & sons, Inc., vol. 9 (1987), "Membranes" by I. Cabasso (month N/A).

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