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Corrosion resistant metal oxide electrode catalyst for oxygen reduction

Foreign code F110003171
File No. A151-16WO
Posted date Jun 17, 2011
Country United States of America
Application number 66060205
Gazette No. 20070259267
Gazette No. 7919215
Date of filing Aug 18, 2005
Gazette Date Nov 8, 2007
Gazette Date Apr 5, 2011
International application number JP2005015052
International publication number WO2006019128
Date of international filing Aug 18, 2005
Date of international publication Feb 23, 2006
Priority data
  • P2004-239589 (Aug 19, 2004) JP
  • P2005-093651 (Mar 29, 2005) JP
  • 2005WO-JP15052 (Aug 18, 2005) WO
Title Corrosion resistant metal oxide electrode catalyst for oxygen reduction
Abstract (US7919215)
A corrosion-resistant electrode catalyst for oxygen reduction includes a main catalyst composed of at least one transition metal oxide selected from oxygen-deficient ZrO2, Ta2O5, Nb2O5, TiO2, V2O5, MoO3, and WO3 and a co-catalyst composed of gold.
The electrode catalyst is used in contact with an acidic electrolyte at a potential at least 0.4 V higher than the reversible hydrogen electrode potential.
The catalyst may be used, for example, in such a form that the transition metal oxide in the form of fine particles and gold in the form of fine particles, or fine particles including fine gold particles coated with the transition metal oxide are dispersed on a catalyst carrier which is an electron conductive powder.
This electrode catalyst is suitable as an electrode catalyst for an electrochemical system using an acidic electrolyte in the fields of water electrolysis, inorganic/organic electrolysis, fuel cells, etc.
Scope of claims [claim1]
1. A corrosion-resistant oxygen electrode for fuel cell, which uses an acidic electrolyte, comprising: an electrode substrate;
a gold layer as a promoter formed on the electrode substrate; and
a transition metal oxide layer as a catalyst formed on the gold layer, the transition metal oxide layer comprising at least one transition metal oxide selected from Ta2O5, Nb2O5, SnO2, TiO2, V2O5, and ZrOx1 wherein the value of X1 satisfies 0.25<X1<2.0 at a thickness of 20 to 30 nm,
wherein the transition metal oxide layer is in a oxygen-deficient state, and wherein the oxygen electrode is configured as a part of the fuel cell comprising the acidic electrolyte and a fuel electrode.
[claim2]
2. The corrosion-resistant oxygen electrode according to claim 1, wherein the transition metal oxide layer comprises oxygen-deficient Ta2O5.
[claim3]
3. The corrosion-resistant oxygen electrode according to claim 1, wherein the transition metal oxide layer comprises oxygen-deficient Nb2O5.
[claim4]
4. The corrosion-resistant oxygen electrode according to claim 1, wherein the transition metal oxide layer comprises oxygen-deficient SnO2.
[claim5]
5. The corrosion-resistant oxygen electrode according to claim 1, wherein the transition metal oxide layer comprises oxygen-deficient TiO2.
[claim6]
6. The corrosion-resistant oxygen electrode according to claim 1, wherein the transition metal oxide layer comprises oxygen-deficient V2O5.
  • Inventor, and Inventor/Applicant
  • OTA KENICHIRO
  • KAMIYA NOBUYUKI
  • MITSUSHIMA SHIGENORI
  • ISHIHARA AKIMITSU
  • YAN LIU
  • 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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