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HIGHLY ACTIVE AND STABLE CATALYST PARTICLES, ELECTRODE CATALYST OBTAINED USING SAME, AND PROCESS FOR PRODUCING SAME

Foreign code F130007268
File No. S2011-1192-N0
Posted date 2013年4月5日
Country 世界知的所有権機関(WIPO)
International application number 2012JP072468
International publication number WO 2013/035698
Date of international filing 平成24年9月4日(2012.9.4)
Date of international publication 平成25年3月14日(2013.3.14)
Priority data
  • 特願2011-196608 (2011.9.9) JP
Title HIGHLY ACTIVE AND STABLE CATALYST PARTICLES, ELECTRODE CATALYST OBTAINED USING SAME, AND PROCESS FOR PRODUCING SAME
Abstract

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.

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • UNIVERSITY OF YAMANASHI,
  • WATANABE, MASAHIRO,
  • UCHIDA, HIROYUKI,
  • YANO, HIROSHI
  • Inventor
  • WATANABE, MASAHIRO,
  • UCHIDA, HIROYUKI,
  • YANO, HIROSHI
IPC(International Patent Classification)
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