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AssigneeDanmarks Tekniske Universitet
InventorsJens Nørskov, Jeffrey Greeley, Ifan Stephens, Alexander S. Bondarenko, Tobias Johansson, Heine Anton Hansen, Thomas Jaramillo, Jan Rossmeisl, Ib Chorkendorff
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The present invention concerns electrode catalysts used in fuel cells, such as proton exchange membrane (PEM) fuel cells. The invention is related to the reduction of the noble metal content and the improvement of the catalytic efficiency by low level substitution of the noble metal to provide new and innovative catalyst compositions in fuel cell electrodes. The novel electrode catalysts of the invention comprise a noble metal selected from Pt, Pd and mixtures thereof alloyed with a further element selected from Sc, Y and La as well as any mixtures thereof, wherein said alloy is supported on a conductive support material.
An electrode comprising an Pt3Y alloy wherein said alloy is supported on an electrically conductive support material, wherein said electrode does not also contain 0.1% to 20% by weight of one or more metals selected from the group consisting of molybdenum, tantalum and tungsten, and 0.5% to 25% by weight of one or more elements selected from the group consisting of barium, strontium, and calcium.
An electrode comprising a Pt3Y alloy, wherein said alloy is supported on an electrically conductive support material, wherein said electrode does not also contain 0.1% to 20% by weight of one or more metals selected from the group consisting of molybdenum, tantalum and tungsten, and 0.5% to 25% by weight of one or more elements selected from the group consisting of barium, strontium, and calcium, and, wherein said alloy is crystalline.
An electrode comprising a Pt5La alloy, wherein said alloy is supported on an electrically conductive support material, wherein said electrode does not also contain 0.1% to 20% by weight of one or more metals selected from the group consisting of molybdenum, tantalum and tungsten, and 0.5% to 25% by weight of one or more elements selected from the group consisting of barium, strontium, and calcium.
An electrode comprising a Pt5Y alloy, wherein said alloy of said electrode is supported on an electrically conductive support material.
An electrode comprising a Pt5La alloy, wherein said alloy is supported on an electrically conductive support material, wherein said electrode does not also contain 0.1% to 20% by weight of one or more metals selected from the group consisting of molybdenum, tantalum and tungsten, and 0.5% to 25% by weight of one or more elements selected from the group consisting of barium, strontium, and calcium, and, wherein said alloy is crystalline.
An electrode comprising a Pt5Y alloy, wherein said alloy of said electrode is supported on an electrically conductive support material, and, wherein said alloy is crystalline.
Dependencies are inferred from the claim text.