Noble metal particle and process of producing the same
AssigneeNippon Sheet Glass Co., Ltd.
InventorRyohei Ogawa
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Abstract
The present invention provides a noble metal particle with an improved methanol-oxidation property. This noble metal particle has a platinum particle and ruthenium particles deposited on only part of the surface of the platinum particle. This noble metal particle suitably can be produced by precipitating the ruthenium particles out of the solution so that the ruthenium particles are deposited on only part of the surface of the platinum particle by further adding a ruthenium salt into the solution and reducing the ruthenium salt after the reduction of the platinum salt in the solution essentially is completed. This noble metal particle is suitable as a catalyst to be supported on an electrode of a polymer electrolyte fuel cell typified by a direct methanol fuel cell.
Claims11
A noble metal particle comprising:
- a platinum particle;
- and
- ruthenium particles that are deposited on only part of the surface of the platinum particle,
- wherein a ratio of ruthenium of the ruthenium particles to platinum of the platinum particle is in a range between 0.15 and 0.8 in terms of molar ratio.
(canceled)
A process of producing a noble metal particle having a platinum particle and ruthenium particles that are deposited on only part of the surface of the platinum particle, the process comprising the steps of:
- precipitating the platinum particle out of a solution by reducing a platinum salt contained in the solution;
- and
- precipitating the ruthenium particles out of the solution containing the platinum particle so that the ruthenium particles are deposited on only part of the surface of the platinum particle, by adding a ruthenium salt into the solution and reducing the ruthenium salt after the reduction of the platinum salt in the solution essentially is completed.
Dependencies are inferred from the claim text.