Electrode catalyst for oxygen reduction and gas diffusion electrode

• US 20060260955A1
• Filed: 12/16/2003
• Published: 11/23/2006
• Est. Priority Date: 12/17/2002
• Status: Active Grant

• Current Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Inventors: Sasaki, Takeaki, Hachiya, Toshinori, Morimoto, Isao
• Granted Patent: US 7,566,388 B2
• Time in Patent Office: Days
• US Class Current: 205/759
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/10 of rare earths
• CPC Class Codes: B01J 23/66 Silver or gold
• CPC Class Codes: B01J 37/03 Precipitation; Co-precipitation
• CPC Class Codes: C25B 11/091 consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
• CPC Class Codes: C25B 11/093 at least one noble metal or noble metal oxide and at least one non-noble metal oxide
• CPC Class Codes: H01M 4/8605 Porous electrodes
• CPC Class Codes: H01M 4/923 Compounds thereof with non-metallic elements
• CPC Class Codes: H01M 4/925 supported on carriers, e.g. powder carriers
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

An electrode catalyst comprising a conductive carrier, and a mixture containing a particulate noble metal and at least one particulate rare-earth oxide, the mixture being supported on the conductive carrier wherein the particulate rare-earth oxide has an alkaline-earth metal as solid solution therein.

Claims

1. An electrode catalyst, comprising:

a conductive carrier, and

a mixture containing a particulate noble metal and at least one particulate rare-earth oxide, the mixture being supported on said conductive carrier

wherein said particulate rare-earth oxide has an alkaline-earth metal as solid solution therein.

2. The electrode catalyst according to claim 1, wherein said conductive carrier is a particulate carbon.

3. The electrode catalyst according to claim 1, wherein said noble metal is silver, platinum, or palladium.

4. The electrode catalyst according to claim 1, wherein said noble metal is silver.

5. The electrode catalyst according to claim 1 wherein the molar ratio of said noble metal to said rare-earth oxide is from 1:

0.01 to 1;

4.0.

6. The electrode catalyst according to claim 1, wherein said rare-earth oxide is cerium oxide.

7. The electrode catalyst according to claim 1, wherein said alkaline-earth metal is at least one selected from a group consisting of magnesium, calcium, and strontium.

8. The electrode catalyst according to claim 6, wherein the molar ratio of said cerium oxide to said alkaline-earth metal is from 1:

0.005 to 1;

0.3.

9. The electrode catalyst according to claim 1 for use in a gas diffusion electrode for brine electrolysis.

10. A gas diffusion electrode for brine electrolysis, characterized by use of the electrode catalyst according to claim 1.

12. A process for preparing a gas diffusion electrode for brine electrolysis comprising laminating a reaction layer containing the electrode catalyst according to claim 1, a gas diffusion layer containing a conductive carrier, and a collector.

13. Use of the electrode catalyst according to claim 1 in a gas diffusion electrode for brine electrolysis.

14. A method for using the electrode catalyst according to claim 1, characterized in that the electrode catalyst is used as a catalyst component for the reaction layer of a gas diffusion electrode for brine electrolysis.

15. A method for gas diffusion electrode-based brine electrolysis, comprising using the electrode catalyst according to claim 1.

16. The electrode catalyst according to claim 2, wherein said noble metal is silver, platinum, or palladium.

17. The electrode catalyst according to claim 16, wherein said noble metal is silver.

18. The electrode catalyst according to claim 17, wherein the molar ratio of said noble metal to said rare-earth oxide is from 1:

0.01 to 1;

4.0.

19. The electrode catalyst according to claim 18, wherein said rare-earth oxide is cerium oxide.

20. The electrode catalyst according to claim 19, wherein said alkaline-earth metal is at least one selected from a group consisting of magnesium, calcium, and strontium.

21. The electrode catalyst according to claim 20, wherein the molar ratio of said cerium oxide to said alkaline-earth metal is from 1:

0.005 to 1;

0.3.

22. The electrode catalyst according to claim 21 for use in a gas diffusion electrode for brine electrolysis.

23. A gas diffusion electrode for brine electrolysis, characterized by use of the electrode catalyst according to claim 22.

24. A process for preparing a gas diffusion electrode for brine electrolysis comprising laminating a reaction layer containing the electrode catalyst according to claim 22, a gas diffusion layer containing a conductive carrier, and a collector.

25. Use of the electrode catalyst according to claim 22 in a gas diffusion electrode for brine electrolysis.

26. A method for using the electrode catalyst according to claim 22, characterized in that the electrode catalyst is used as a catalyst component for the reaction layer of a gas diffusion electrode for brine electrolysis.

27. A method for gas diffusion electrode-based brine electrolysis, comprising using the electrode catalyst according to claim 22.

11. An electrode catalyst comprising a conductive carrier, and a mixture containing a particulate noble metal and at least one particulate rare-earth oxide, the mixture being supported on the conductive carrier.