Title:
HIGHLY ACTIVE AND STABLE CATALYST PARTICLES, ELECTRODE CATALYST OBTAINED USING SAME, AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/035698
Kind Code:
A1
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.
Inventors:
WATANABE MASAHIRO (JP)
UCHIDA HIROYUKI (JP)
YANO HIROSHI (JP)
UCHIDA HIROYUKI (JP)
YANO HIROSHI (JP)
Application Number:
PCT/JP2012/072468
Publication Date:
March 14, 2013
Filing Date:
September 04, 2012
Export Citation:
Assignee:
UNIV YAMANASHI (JP)
WATANABE MASAHIRO (JP)
UCHIDA HIROYUKI (JP)
YANO HIROSHI (JP)
WATANABE MASAHIRO (JP)
UCHIDA HIROYUKI (JP)
YANO HIROSHI (JP)
International Classes:
B01J23/89; B01J37/08; B01J37/16; B22F1/054; B22F1/17; H01M4/88; H01M4/90; H01M4/92; H01M8/10
Foreign References:
| JP2008525638A | 2008-07-17 | |||
| JP2005135900A | 2005-05-26 |
Other References:
K. OKAYA ET AL.: "Control of Particle Size of Pt and Pt Alloy Electrocatalysts Supported on Carbon Black by the Nanocapsule Method", APPLIED MATERIALS AND INTERFACES, vol. 2, no. 3, 2010, pages 888 - 895
Attorney, Agent or Firm:
SK INTELLECTUAL PROPERTY LAW FIRM et al. (JP)
SK patent business corporation (JP)
SK patent business corporation (JP)
Download PDF:
Claims:
Previous Patent: LIP SEAL FOR WATER PUMP
Next Patent: ALUMINUM-BASED ELECTROCONDUCTIVE MATERIAL, AND ELECTRIC WIRE AND CABLE OBTAINED USING SAME
Next Patent: ALUMINUM-BASED ELECTROCONDUCTIVE MATERIAL, AND ELECTRIC WIRE AND CABLE OBTAINED USING SAME