Fast response, high rate, gas diffusion electrode and method of

Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation

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429 42, 429 44, H01M 1206, H01M 496

Patent

active

046159541

ABSTRACT:
Disclosed are gas fed, porous electrodes capable of steady, high current density operation for practical periods of service, e.g. as oxygen cathodes in metal-air batteries. The subject electrodes feature at least two bonded composite layers, one of which is a form-stable, conductive wetproofing layer while the other is an unusually thin active layer containing active carbon particles predominantly between about 2 and about 20 micrometers and having a high internal surface area, e.g. a B.E.T. surface area of over 1000 m.sup.2 /gram. A simple and highly successful method of preparing such electrodes is also disclosed, which avoids the necessity of separately forming and handling the thin active layer.

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