Chemistry: electrical and wave energy – Processes and products
Patent
1987-07-07
1989-04-04
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 73R, 204 78, 204101, 204242, 204252, 204DIG4, 204290R, 204130, 429 17, 429190, 502101, 502216, 502223, C25B 300
Patent
active
048183539
ABSTRACT:
A transition metal electrocatalyst surface (e.g. a porous surface of finely divided Group VIII or Group I-B metal with an attached current collector) is modified by a sulfur treatment, using an oxidized sulfur species of average sulfur oxidation state of about 4 or less, e.g. SO.sub.2 dissolved in aqueous acid. Treatment of the transition metal with SO.sub.2 or the like typically provides up to 100% coverage of the surface electrocatalyst sites with chemisorbed sulfur-containing species and perhaps subsurface effects as well, but washing or other non-electrochemical techniques can remove 5-90% (e.g. 25-70%) of the chemisorbed SO.sub.2 or the like from the surface, leaving substantially only a very strongly bound form of the sulfur-containing species. The strongly bound sulfur-containing species can then be reduced to form a highly beneficial, selectively-improving pattern of sites containing reduced -S (e.g. sulfur or sulfide) on the electrocatalyst surface. Electrochemical synthesis cells can be constructed from a cathode and/or anode made form the S-treated electrocatalyst
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Foral Michael J.
Langer Stanley H.
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