Perovskite oxide catalyst for oxygen evolution reactions

Patent metadata

Field	Value
Publication number	US-10167562-B2
Application number	US-201615169116-A
Country	US
Kind code	B2
Filing date	May 31, 2016
Priority date	Jun 1, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A catalyst for an oxygen evolution reaction has a higher and longer-life catalytic activity than that of the conventional and expensive noble metal oxide catalysts, such as RuO 2 and IrO 2 . An A-site ordered perovskite oxide catalyst (such as CaCu 3 Fe 4 O 12 and CaMn 3 Mn 4 O 12 etc.) as an oxygen evolution reaction catalyst is excellent in cost effectiveness. The catalyst has a high catalytic activity compared with a noble metal oxide catalyst, and a long repetition use life since it is extremely stable also under the oxidative reaction conditions. Use of the catalyst is expected to the important energy conversion reactions such as a charge reaction of a metal-air battery, an anode oxygen evolution reaction in the case of a direct water decomposition reaction by sunlight, etc.

First claim

What is claimed is:

1. A catalyst composition comprising:
a catalyst comprising an A-site ordered perovskite oxides. represented by the chemical formula (1): AA' 3 B 4 O 12 , wherein A represents at least one metallic element selected from the group consisting of Na, K, Ca, Sr, Ba, Ag, Pb, Bi, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, A′ represents at least one transition metal element selected from the group consisting of Cu, Mn, Fe, Co and Pd, and forms a covalent bond, and B represents at least one metallic element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ru, Rh, Re, 1 r, Pt, Al, Ga, Ge, Sn and Sb; and
a carrier.

2. The catalyst composition according to claim 1 , wherein an ionic radius of the A-site metal ion is larger than an ionic radius of the A′-site metal ion in the A-site ordered perovskite by 0.37Å or more.

3. The catalyst composition according to claim 1 , wherein the A-site ordered perovskite oxide is the A-site ordered perovskite oxide represented by the chemical formula (2): A I Cu 3 Fe 4 O 12 , wherein A I represents at least one metallic element selected from the group consisting of Ca, Sr, Y, La and Ce, and this Cu has a covalent bond.

4. The catalyst composition according to claim 1 , wherein the A-site ordered perovskite oxide is the A-site ordered perovskite oxide represented by the chemical formula (3): CaCu 3 B I 4 O 12 , wherein Cu has a covalent bond and B I is at least one transition metal element selected from the group consisting of Ti, Mn, Fe and Ru.

5. The catalyst composition according to claim 1 , wherein the A-site ordered perovskite oxide is the A-site ordered perovskite oxide which is represented by the chemical formula (4):
CaCu 3 Fe 4 O 12 , and this Cu has a covalent bond.

6. The catalyst composition according to claim 1 , wherein the A-site ordered perovskite oxide is an A-site ordered perovskite oxide represented by the chemical formula (5): A II Cu 3 B II 4 O 12 or the chemical formula (6): A II Mn 3 B II 4 O 12 , wherein A II represents at least one metallic element selected from the group consisting of Ca, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and B II represents Ti, Mn, Ru or (Fe 0.5 +Sb 0.5 ).

7. The catalyst composition according to claim 6 , wherein the A-site ordered perovskite oxide represented by the chemical formula (5) is CaCu 3 Ti 4 O 12 , CaCu 3 Ru 4 O 12 , CaCu 3 (Fe 2 Sb 2 )O 12 or CaCu 3 (Fe 2 Re 2 )O 12 , or the A-site ordered perovskite oxide represented by the chemical formula (6) is CaMn 3 Mn 4 O 12 .

8. The catalyst composition according to claim 7 wherein the A-site ordered perovskite oxide is produced by an atmospheric pressure synthetic process.

9. The catalyst composition according to claim 1 , wherein the A-site ordered perovskite oxide is produced by a high pressure synthetic process of 1 GPa -20 GPa.

Assignees

• Univ Osaka Prefect Public Corp
• Fuji Die Co

Inventors

• Yagi Shunsuke
• Yamada Ikuya
• Wada Kouhei

Classifications

• C25B1/04 Primary

  by electrolysis of water · CPC title

• Y02E60/366

  Cross-Sectional Technologies · mapped topic

• C25B11/0463 Primary

  Chemistry & Metallurgy · mapped topic

• C25B11/0773 Primary

  of the perovskite type · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title