Hydrogen absorption induced metal deposition on palladium and palladium-alloy particles
AssigneeBrookhaven Science Associates, LLC
InventorsJia X. Wang, Radoslav R. Adzic
Life of this patent
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Abstract
The present invention relates to methods for producing metal-coated palladium or palladium-alloy particles. The method includes contacting hydrogen-absorbed palladium or palladium-alloy particles with one or more metal salts to produce a sub-monoatomic or monoatomic metal- or metal-alloy coating on the surface of the hydrogen-absorbed palladium or palladium-alloy particles. The invention also relates to methods for producing catalysts and methods for producing electrical energy using the metal-coated palladium or palladium-alloy particles of the present invention.
Claims33
A method for producing metal-coated palladium or palladium-alloy particles, the method comprising contacting hydrogen-absorbed palladium or palladium-alloy particles with a metal salt or metal salt mixture to deposit a sub-monoatomic or monoatomic metal coating or sub-monoatomic or monoatomic metal alloy coating on the surface of said hydrogen-absorbed palladium or palladium-alloy particles, thereby producing metal-coated or metal alloy-coated palladium or palladium-alloy particles.
A method for producing metal-coated palladium or palladium-alloy particles, the method comprising contacting hydrogen-absorbed palladium or palladium-alloy particles with a metal salt or metal salt mixture to deposit a sub-monoatomic or monoatomic metal coating or sub-monoatomic or monoatomic metal alloy coating on the surface of said hydrogen-absorbed palladium or palladium-alloy particles, thereby producing metal-coated or metal alloy-coated palladium or palladium-alloy particles, wherein the method does not require copper electrodeposition and does not generate copper waste.
A method for producing electrical energy, the method comprising:
- (i) contacting an oxygen-reducing cathode of a fuel cell with oxygen, wherein the oxygen-reducing cathode is comprised of platinum-coated or platinum alloy-coated palladium or palladium-alloy particles bound to an electrically conductive support;
- wherein said platinum-coated or platinum alloy-coated palladium or palladium-alloy particles are produced by a method comprising:
- contacting hydrogen-absorbed palladium or palladium-alloy particles with a platinum salt, or a mixture of a platinum salt and one or more non-platinum metal salts, to deposit a sub-monoatomic or monoatomic platinum coating or sub-monoatomic or monoatomic platinum alloy coating on the surface of said palladium or palladium-alloy particles, thereby producing platinum-coated or platinum alloy-coated palladium or palladium-alloy particles;
- and p1 (ii) contacting an anode of said fuel cell with a fuel source;
- wherein said oxygen-reducing cathode is in electrical contact with said anode;
- and said oxygen-reducing cathode and said anode are in chemical contact through mutual contact with a proton-conducting medium.
Dependencies are inferred from the claim text.