Electrode substrate with integral edge seal and method of formin

Details Electrode substrate with integral edge seal and method of formin Electrode substrate with integral edge seal and method of formin

1988-08-12

1989-07-11

Skapars, Anthony

Metal working

Method of mechanical manufacture

Electrical device making

427115, H01M 800

Patent

active

048458406

ABSTRACT:
The edges of a porous substrate plate used in a fuel cell power plant are densified by impregnating a suspension of finely divided material in the interstitial spaces in the plate edges. The suspension, in the form of an "ink" is forced into the plate edges via a pressure differential applied through the plate between two press blocks. The ink is forced into the plate after a catalyst layer has been applied to one surface of the substrate plate. The ink thus penetrates to the inner surface of the catalyst layer, and also forms an integral filler band outwardly of the catalyst layer, which filler band has a top surface which is coplanar with the top surface of the catalyst layer. After the impregnation step, the seals are dried to form a dense low porosity border on the substrate plates which will fill with electrolyte to form a wet seal that prevents gas crossover through the edges of the substrate plates.

REFERENCES:
patent: 4185145 (1980-01-01), Breault
patent: 4652502 (1987-03-01), Breault et al.
patent: 4781727 (1988-11-01), Mitsuda et al.

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