Corrosion resistant metal oxide electrode catalyst for...

Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Electrode structure or composition

Reexamination Certificate

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C429S528000, C429S532000, C429S500000, C427S115000

Reexamination Certificate

active

07919215

ABSTRACT:
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 WO3and 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.

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International Search Report of PCT/JP2005/015052, date of mailing: Nov. 22, 2005.
Translation of International Preliminary Report on Patentability mailed Mar. 29, 2007 of International Application No. PCT/JP2005/015052.

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