Electrode material, electrode, and battery

Patent metadata

Field	Value
Publication number	US-9793587-B2
Application number	US-201715586429-A
Country	US
Kind code	B2
Filing date	May 4, 2017
Priority date	Feb 5, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

An electrode includes a plant-derived porous carbon material having an ability to catalyze oxygen reduction.

First claim

What is claimed is:

1. An electronic device, comprising:
a battery,
the battery comprising an electrode;
wherein the electrode includes a plant-derived porous carbon material that catalyzes oxygen reduction at the electrode.

2. The electronic device according to claim 1 ,
wherein the plant-derived porous carbon material is a carbonized material treated with at least one of an acid and an alkali.

3. The electronic device according to claim 1 ,
wherein the plant-derived porous carbon material is used for the oxygen reduction at a pH of 3 or more and 10 or less when generating electric power.

4. The electronic device according to claim 1 ,
wherein a specific surface area of the plant-derived porous carbon material is 100 m 2 /g or more as measured by the nitrogen BET method.

5. The electronic device according to claim 1 ,
wherein a pore volume of the plant-derived porous carbon material is 0.2 cm 3 /g or more as measured by the BJH method and 0.1 cm 3 /g or more as measured by the MP method.

6. The electronic device according to claim 1 ,
wherein an oxygen reduction starting potential of the plant-derived porous carbon material is more noble than 0.15 V as measured versus an Ag/AgC 1 reference electrode.

7. The electronic device according to claim 1 ,
wherein the plant-derived porous carbon material includes an oxygen reduction catalyst supported thereon, and wherein the plant-derived porous carbon material and the oxygen reduction catalyst each increase a rate of the oxygen reduction.

8. The electronic device according to claim 7 ,
wherein the oxygen reduction catalyst is at least one material selected from the group consisting of a noble metal, a transition-metal oxide, a transition-metal porphyrin, phthalocyanine, a porphyrin polymer, a phthalocyanine polymer, perovskite, and a product of pyrolysis of a cobalt salt using polyacrylonitrile.

9. The electronic device according to claim 1 ,
wherein the plant-derived porous carbon material is supported on a supporting member, and wherein the electrode outputs current during the catalysis of the oxygen reduction.

10. The electronic device according to claim 1 ,
wherein the electrode is used as a positive electrode of the battery.

11. The electronic device according to claim 1 ,
wherein the plant-derived porous carbon material is used for the oxygen reduction under a pH-neutral condition.

12. The electronic device according to claim 1 ,
wherein the battery includes an electrolytic solution containing a buffer sub stance.

13. The electronic device according to claim 12 ,
wherein the buffer substance has a pK a of 4 or more and 10 or less.

14. The electronic device according to claim 1 ,
wherein the battery is one of an enzymatic biofuel cell and a microbial fuel cell.

15. The electronic device according to claim 1 ,
wherein the electronic device is one of a cellular telephone, a mobile device, a robot, a personal computer, a game machine, a camera-integrated video tape recorder (VTR), a vehicle-mounted device, a home appliance, and an industrial good.

16. A sensor, comprising:
an electrode,
wherein the electrode includes a plant-derived porous carbon material configured to catalyze oxygen reduction at the electrode.

17. The sensor according to claim 16 ,
wherein the plant-derived porous carbon material is a carbonized material treated with at least one of an acid and an alkali.

18. The sensor according to claim 16 ,
wherein the plant-derived porous carbon material is used for the oxygen reduction at a pH of 3 or more and 10 or less when generating electric power.

19. The sensor according to claim 16 ,
wherein a specific surface area of the plant-derived porous carbon material is 100 m 2 /g or more as measured by the nitrogen BET method.

20. The sensor according to claim 16 ,
wherein a pore volume of the plant-derived porous carbon material is 0.2 cm 3 /g or more as measured by the BJH method and 0.1 cm 3 /g or more as measured by the MP method.

21. The sensor according to claim 16 ,
wherein an oxygen reduction starting potential of the plant-derived porous carbon material is more noble than 0.15 V as measured versus an Ag/AgCl reference electrode.

22. The sensor according to claim 16 ,
wherein the plant-derived porous carbon material includes an oxygen reduction catalyst supported thereon, and wherein the plant-derived porous carbon material and the oxygen reduction catalyst each increase a rate of the oxygen reduction.

23. The sensor according to claim 22 ,
wherein the oxygen reduction catalyst is at least one material selected from the group consisting of a noble metal, a transition-metal oxide, a transition-metal porphyrin, phthalocyanine, a porphyrin polymer, a phthalocyanine polymer, perovskite, and a product of pyrolysis of a cobalt salt using polyacrylonitrile.

24. The sensor according to claim 16 ,
wherein the plant-derived porous carbon material is supported on a supporting member, and wherein the electrode outputs current during the catalysis of the oxygen reduction.

25. The sensor according to claim 16 ,
wherein the plant-derived porous carbon material is used for the oxygen reduction under a pH-neutral condition.

Assignees

• Sony Corp

Inventors

• Iida Hironori
• Murata Kenichi
• Nakagawa Takaaki
• Yamada Shinichiro

Classifications

• H01M8/16

  Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts · CPC title

• H01M4/926

  on carbon or graphite · CPC title

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M12/06

  with one metallic and one gaseous electrode · CPC title

• H01M4/96

  Carbon-based electrodes · CPC title