Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature
Patent
1991-03-07
1992-07-21
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Having magnetic field feature
424 33, 424 40, H01M 490, H01M 810
Patent
active
051321939
ABSTRACT:
In this method, a lower alcohol is oxidized directly (i.e. without reformation) to CO.sub.2 +H.sub.2 O at the anode of a fuel cell, and a reducible gas (e.g. air or O.sub.2) is reduced at the cathode. High, reasonably constant current densities at low over-voltages can be obtained. The electrolyte is preferably an acidic solid polymer electrolyte, and the anode comprises, as the electrocatalyst, a combination of a Group VIII noble metal with gold having significant Au (111) character. The (111) face of gold crystals (preferably crystals in the size range of about 4 to 15 nm) have been found to be specific for oxidation of intermediate alcohol oxidation products (CO, CHO, COH, HCHO, CH.sub.3 CHO, etc.) to CO.sub.2 or CO.sub.2 +H.sub.2 O. Thus, the combination of a Group VIII metal such as Pt with Au (111) avoids "poisoning" of the Pt by these intermediate products. Some protection against such "poisoning" is also provided with Au (110), but Au (100) and polycrystalline gold are not considered useful in the electro-oxidation of lower alcohols (particularly methanol and ethanol). If the alcohol "fuel" is methanol, the combination of Group VIII noble metal and Au (111) should be microscopically homogeneous (e.g. Pt/Au cubo-octahedral crystals with a high level of (111) faceting), but if the "fuel" is ethanol, the Group VIII noble metal and the Au (111) can be combined in various ways, including macroscopic homogeneous mixtures and heterogeneous blends.
REFERENCES:
patent: 3239382 (1966-03-01), Thompson
patent: 3288653 (1966-11-01), Holt et al.
patent: 3343990 (1967-09-01), Giddy
patent: 3443998 (1969-05-01), Shropshire
patent: 3467554 (1969-09-01), Forten et al.
patent: 3506494 (1970-04-01), Adlhart
patent: 3510355 (1970-05-01), Fishman
patent: 3701687 (1972-10-01), Grubb et al.
patent: 3776776 (1973-12-01), Petrow
patent: 4127468 (1978-11-01), Alfenaar et al.
patent: 4390603 (1983-06-01), Kawana et al.
patent: 4407905 (1983-10-01), Takeuchi et al.
patent: 4407906 (1983-10-01), Stonehart
patent: 4457986 (1984-07-01), Bindra et al.
patent: 4478917 (1984-10-01), Fujita et al.
patent: 4614692 (1986-09-01), Kajiyama et al.
patent: 4711829 (1987-12-01), Luczak et al.
patent: 4828941 (1989-05-01), Sterzel
Grant, ed. Hackh's Chemical Dictionary McGraw-Hill Book Company, New York et al., p. 27, 1980.
McIntyre, J. D. E. et al, "Electrochemistry at Single-Crystal Metal Electrodes, Electrocatalytic . . . on Oxygen Reduction", in: Electrochemistry and Physics of Electrocatalysis, Weaver et al., Ed., Weaver et al., The Electrochemical Society PV 84-12, pp. 102-129.
Kinoshita, K., "Small-Particle Effects and Structural Considerations for Electrocatalysis", Chapter 8 in Modern Aspects of Electrochemistry, Ed. Bochris et al., pp. 557-566.
R. R. Adzic et al, Surf Sci. 94, L191-L194 (1980).
R. R. Adzic et al, Nature, 296, 137-138 (1982).
D. S. Cameron et al, Platinum Metals Rev. 31, 173-181 (1987).
Reddy N. R. K. Vilambi
Taylor Earl J.
Kalafut Stephen
Physical Sciences Inc.
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