Chemistry: electrical current producing apparatus – product – and – Having earth feature
Patent
1976-09-15
1978-01-03
LeFevour, Charles F.
Chemistry: electrical current producing apparatus, product, and
Having earth feature
141 11, 2524253, H01M 486
Patent
active
040668231
ABSTRACT:
An improved gas permeable hydrophobic electrode and its method of manufacture is provided. The electrode includes (a) a current collecting grid formed of an electrically conductive metal, e.g. platinum, gold, stainless steel, nickel-clad iron, nickel wire mesh, silver wire mesh, expanded nickel, or expanded silver; (b) a noble metal catalyst, e.g. silver, platinum or palladium catalyst deposited on, and adhered to, both side faces of the current collecting grid, e.g. the nickel grid, such noble metal catalyst, e.g. silver, having been deposited in situ on a fugitive substrate, e.g. aluminum foil, from a paste of an aqueous suspension of a water-soluble metal salt, e.g. silver salt, a fluorocarbon polymer, e.g. polytetrafluoroethylene, a wetting agent, e.g. octyl phenoxpolyethoxyethanol and activated carbon, which is subsequently dried and cured at a temperature not exceeding about 150.degree. C.; and (c) a hydrophobic semi-permeable membrane, e.g. a fibrous polytetrafluoroethylene membrane or a microporous polypropylene membrane on one side of such coated grid. The improved method of manufacture involves applying the above-noted paste to a fugitive substrate and then drying and curing such paste at a temperature not exceeding about 150.degree. C.
REFERENCES:
patent: 3432355 (1969-03-01), Niedrach et al.
patent: 3668014 (1972-06-01), Katsoulis
patent: 3899354 (1975-08-01), Kordesch
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