Chemistry: electrical and wave energy – Processes and products
Patent
1991-03-15
1992-07-28
Niebling, John
Chemistry: electrical and wave energy
Processes and products
204290R, 204252, 429 27, 429 44, C25B 116, C25B 1108
Patent
active
051338424
ABSTRACT:
The disclosed electrocatalyst material is useful in electrodes, especially in cathodes for the reduction of oxygen or peroxide to water or hydroxide. The electrocatalyst typically comprises 0.1 to 20 weight-%, based on the weight of the material, of a supported particulate elemental gold wherein the particles are apparently crystalline in nature, apparently with exposed (100) faces, but smaller in size than 5 nanometers (<.ANG.). These tiny monocrystals of gold are supported on carbon black or particulate conductive ceramic-like compounds having a B.E.T. surface area of at least 50 m.sup.2 /g. The supported gold monocrystals appear to be selective for the reductions described above, and performance in air- or O.sub.2 -cathodes is outstanding, e.g. >0.7 volts vs. RHE at 200 mA/cm.sup.2, generally indicating a substantial proportion of four-electron change reactions when oxygen is being reduced. The electrodes (which are also useful as anodes in acid electrolytes) are made by impregnating the support material with a reducible gold compound dissolved in a polar solvent, gently evaporating the solvent, and chemically reducing the gold compound in situ at a moderate temperature with a flowing reducing gas (e.g. H.sub.2) then applying the resulting supported gold to a porous backing material. Typical gold content levels at the electrode surface are <2 mg/cm.sup.2. Cathodes of this invention are useful in various types of air or oxygen-depolarized cells, alkaline fuel cells, metal/air cells, metal/H.sub.2 O.sub.2 cells, oxygen sensors, electrochemical caustic concentrators, etc.
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Moniz Gary A.
Taylor Earl J.
Gorgos Kathryn
Niebling John
Physical Sciences Inc.
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