Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Electrode structure or composition
Reexamination Certificate
2011-04-05
2011-04-05
Alejandro, Raymond (Department: 1727)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
Electrode structure or composition
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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Ishihara Akimitsu
Kamiya Nobuyuki
Mitsushima Shigenori
Ota Ken-ichiro
Yan Liu
Alejandro Raymond
Japan Science and Technology Agency
Westerman Hattori Daniels & Adrian LLP
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