Electrode material, electrode, and battery

Patent metadata

Field	Value
Publication number	US-2017237135-A1
Application number	US-201715586429-A
Country	US
Kind code	A1
Filing date	May 4, 2017
Priority date	Feb 5, 2013
Publication date	Aug 17, 2017
Grant date	—

Abstract

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

First claim

1 - 18 . (canceled)

19 . 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.

20 . The electronic device according to claim 19 ,
wherein the plant-derived porous carbon material is a carbonized material treated with at least one of an acid and an alkali.

21 . The electronic device according to claim 19 ,
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.

22 . The electronic device according to claim 19 ,
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.

23 . The electronic device according to claim 19 ,
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.

24 . The electronic device according to claim 19 ,
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.

25 . The electronic device according to claim 19 ,
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.

26 . The electronic device according to claim 25 ,
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.

27 . The electronic device according to claim 19 ,
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.

28 . The electronic device according to claim 19 ,
wherein the electrode is used as a positive electrode of the battery.

29 . The electronic device according to claim 19 ,
wherein the plant-derived porous carbon material is used for the oxygen reduction under a pH-neutral condition.

30 . The electronic device according to claim 19 ,
wherein the battery includes an electrolytic solution containing a buffer sub stance.

31 . The electronic device according to claim 30 ,
wherein the buffer substance has a pK a of 4 or more and 10 or less.

32 . The electronic device according to claim 19 ,
wherein the battery is one of an enzymatic biofuel cell and a microbial fuel cell.

33 . The electronic device according to claim 19 ,
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.

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

35 . The sensor according to claim 34 ,
wherein the plant-derived porous carbon material is a carbonized material treated with at least one of an acid and an alkali.

36 . The sensor according to claim 34 ,
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.

37 . The sensor according to claim 34 ,
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.

38 . The sensor according to claim 34 ,
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.

39 . The sensor according to claim 34 ,
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.

40 . The sensor according to claim 34 ,
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.

41 . The sensor according to claim 40 ,
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.

42 . The sensor according to claim 34 ,
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.

43 . The sensor according to claim 34 ,
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

• H01M12/06

  with one metallic and one gaseous electrode · CPC title

• G01N27/308

  at least partially made of carbon · 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