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Metal oxynitride electrode catalyst

Foreign code F110003170
File No. A151-12WO
Posted date Jun 17, 2011
Country United States of America
Application number 58121004
Gazette No. 20070128884
Gazette No. 7670712
Date of filing Nov 30, 2004
Gazette Date Jun 7, 2007
Gazette Date Mar 2, 2010
International application number JP2004017801
International publication number WO2005053840
Date of international filing Nov 30, 2004
Date of international publication Jun 16, 2005
Priority data
  • P2003-403653 (Dec 2, 2003) JP
  • 2004WO-JP17801 (Nov 30, 2004) WO
Title Metal oxynitride electrode catalyst
Abstract (US7670712)
An electrode catalyst that maintains catalytic activity under conditions of an electrode potential as high as 0.4 V or above and exhibits improved stability.
The metal oxynitride electrode catalyst is composed of an oxynitride containing at least one transition metal element selected from the group consisting of La, Ta, Nb, Ti, and Zr, the metal oxynitride electrode catalyst being used at a potential of 0.4 V or higher relative to the reversible hydrogen electrode potential in an acidic electrolyte.
The metal oxynitride electrode catalyst is useful as an electrode catalyst for electrochemical systems used in acidic electrolytes in the fields of water electrolysis, organic electrolysis, fuel cells, etc.
Scope of claims [claim1]
1. A membrane electrolyte assembly for a fuel cell, comprising: an electrode including an oxygen reduction electrode catalyst comprising an oxynitride containing Ta, wherein atomic ratio of (tantalum):(oxygen):(nitrogen) is (1+-0.1):(1+-0.1):(1+-0.1); and
an acidic electrolyte contacting said oxygen reduction electrode catalyst,
wherein said oxygen reduction electrode catalyst having an oxygen reduction catalytic activity at a potential of 0.4 V or higher relative to the reversible hydrogen electrode potential in said acidic electrolyte.
[claim2]
2. The membrane electrolyte assembly according to claim 1, wherein the oxygen reduction electrode catalyst is dispersed as fine particles on a catalyst carrier which is an electronically conductive powder.
  • Inventor, and Inventor/Applicant
  • OTA KENICHIRO
  • KAMIYA NOBUYUKI
  • MITSUSHIMA SHIGENORI
  • ISHIHARA AKIMITSU
  • DOUMEN KAZUNARI
  • HARA MICHIKAZU
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST Research and Development of System Technologies for Resource Recycling and Minimum Energy Requirement AREA
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