HIGHLY ACTIVE AND STABLE CATALYST PARTICLES, ELECTRODE CATALYST OBTAINED USING SAME, AND PROCESS FOR PRODUCING SAME
外国特許コード | F130007268 |
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整理番号 | S2011-1192-N0 |
掲載日 | 2013年4月5日 |
出願国 | 世界知的所有権機関(WIPO) |
国際出願番号 | 2012JP072468 |
国際公開番号 | WO 2013/035698 |
国際出願日 | 平成24年9月4日(2012.9.4) |
国際公開日 | 平成25年3月14日(2013.3.14) |
優先権データ |
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発明の名称 (英語) | HIGHLY ACTIVE AND STABLE CATALYST PARTICLES, ELECTRODE CATALYST OBTAINED USING SAME, AND PROCESS FOR PRODUCING SAME |
発明の概要(英語) |
There have been a phenomenon in which during the operation of a fuel cell, an alloy component dissolves away during use, resulting in a decrease in activity and an increase in particle diameter. A purpose of the present invention is to provide catalyst particles which comprise: alloy particles that contain a noble metal and have a uniform particle diameter of the order of nanometer and a Pt skin layer which is composed of one to five monatomic layers and with which the surface of the alloy particles has been covered. The other purpose is to provide: an electrode catalyst which comprises a support loaded with the catalyst particles disposed thereon in a highly dispersed state and a process for producing the electrode catalyst. With the catalyst particles, it is possible to reduce the amount of a noble metal to be used, and an improvement in activity as compared with Pt alone can be attained due to an electronic action between the inner metals and the surface Pt skin layer. By entirely covering the inner alloy particles with the Pt layer, the catalyst particles can be made to have high corrosion resistance. When the catalyst particles are produced by a production process in which nanocapsules are used, the catalyst particles are rendered excellent in terms of activity and durability because the active-metal particles have a small diameter and the alloy retains a constant composition. |
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国際特許分類(IPC) |
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日本語項目の表示
発明の名称 | 高活性・安定性電極触媒及びその製造方法 |
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