Metal encapsulated dendritic carbon nanostructure, carbon nanostructure, process for producing metal encapsulated dendritic carbon nanostructure, process for producing carbon nanostructure, and capacitor

Patent metadata

Field	Value
Publication number	US-9656870-B2
Application number	US-74723308-A
Country	US
Kind code	B2
Filing date	Dec 9, 2008
Priority date	Dec 12, 2007
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

This invention provides a metal encapsulated dendritic carbon nanostructure comprising a dendritic carbon nanostructure comprising a branched carbon-containing rod-shaped or annular material and a metallic body capsulated in the carbon nanostructure. There is also provided a dendritic carbon nanostructure comprising a branched carbon-containing rod-shaped or annular material.

First claim

What is claimed is:

1. A dendritic carbon nanostructure having a branched rod-shape or annular-shape, the carbon nanostructure comprising:
a plurality of cavity cells each having a cell wall made of graphene and a cavity enclosed by the cell wall; and
a superficial skin made of graphene having a cell structure, the superficial skin enclosing the plurality of cavity cells,
wherein each of the cavity cells is smaller than a cell of the cell structure of the superficial skin.

2. The dendritic carbon nanostructure as set forth in claim 1 , wherein the dendritic carbon nanostructure is configured as a three-dimensional structure.

3. The dendritic carbon nanostructure as set forth in claim 1 , wherein a length of a branched portion of said dendritic carbon nanostructure is 150 nm or less.

4. The dendritic carbon nanostructure as set forth in claim 1 , wherein a diameter of a branched portion of said dendritic carbon nanostructure is 150 nm or less.

5. The dendritic carbon nanostructure as set forth in claim 1 , having a BET specific surface area of 870 m 2 /g or more.

6. The dendritic carbon nanostructure as set forth in claim 5 , wherein said BET specific surface area is 1300 m 2 /g or more.

7. A pellet comprising a carbon nanostructure as set forth in claim 1 , said carbon nanostructure being pressed.

8. A carrier for supporting a catalyst comprising a carbon nanostructure as set forth in claim 1 .

9. A gas molecule storage material comprising a carbon nanostructure as set forth in claim 1 .

10. A capacitor comprising a pair of electrodes, an electrolyte fluid located between said pair of electrodes, a separator positioned in said electrolyte fluid,
wherein at least one of said electrodes comprises a dendritic carbon nanostructure having a branched rod-shape or annular-shape,
wherein the dendritic carbon nanostructure comprises:
a plurality of cavity cells each having a cell wall made of graphene and a cavity enclosed by the cell wall; and
a superficial skin made of graphene having a cell structure, the superficial skin enclosing the plurality of cavity cells,
wherein each of the cavity cells is smaller than a cell of the cell structure of the superficial skin.

11. The capacitor as set forth in claim 10 , wherein the dendritic carbon nanostructure is configured as a three-dimensional structure.

12. The capacitor as set forth in claim 10 , wherein a length of a branched portion of said dendritic carbon nanostructure is 150 nm or less.

13. The capacitor as set forth in claim 10 , wherein a diameter of a branched portion of said dendritic carbon nanostructure is 150 nm or less.

14. The capacitor as set forth in claim 10 , wherein the dendritic carbon nanostructure has a BET specific surface area of 870 m 2 /g or more.

15. The capacitor as set forth in claim 14 , wherein said BET specific surface area is 1300 m 2 /g or more.

16. The capacitor as set forth in claim 10 , wherein said dendritic carbon nanostructure is a carbon obtained through a thermal treatment for a metal acetylide dendritic crystalline body.

17. The capacitor as set forth in claim 16 , wherein said metal acetylide crystalline body is configured as a metal encapsulated dendritic carbon nanostructure containing a metal and a carbon by contacting an acetylene gas with a solution containing said metal or a salt of said metal at a gas-liquid interface thereof while an ultrasonic wave is applied to said solution.

18. The capacitor as set forth in claim 16 , wherein said solution is agitated when said acetylene gas is contacted with said solution at said gas-liquid interface thereof.

19. The capacitor as set forth in claim 16 , wherein said thermal treatment for said metal acetylide dendritic crystalline body includes a first thermal treatment for segregating carbon elements on said metal acetylide dendritic crystalline body to form a carbon-covering metal acetylide dendritic nanostructure and a second thermal treatment for phase-separating metal elements encapsulated in said carbon-covering metal acetylide dendritic nanostructure.

20. The capacitor as set forth in claim 19 , wherein a solving and washing treatment is conducted for a carbon nanostructure intermediary body obtained through the phase-separation of said metal elements from said carbon-covering metal acetylide dendritic nanostructure to remove a remnant of said metal elements.

21. The capacitor as set forth in claim 19 , wherein said first thermal treatment is conducted within a temperature range of 60° C. to 80° C.

22. The capacitor as set forth in claim 19 , wherein said second thermal treatment is conducted within a temperature range of 160° C. to 200° C. continuously following said first thermal treatment.

23. The capacitor as set forth in claim 19 , wherein a third thermal treatment using a hot water is conducted for said dendritic carbon nanostructure.

24. The capacitor as set forth in claim 23 , wherein said third thermal treatment is conducted within a temperature range of 80° C. to 100° C.

25. The capacitor as set forth in claim 17 , wherein said metal or said salt are silver (Ag) or silver salt.

Assignees

• Nishi Nobuyuki
• Numao Shigenori
• Judai Ken
• Nishijo Junichi
• Mizuuchi Kazuhiko
• Nippon Steel & Sumikin Chem Co
• Inter-University Res Inst Corp Nat Insts Of Natural Sciences

Inventors

• Nishi Nobuyuki
• Numao Shigenori
• Judai Ken
• Nishijo Junichi
• Mizuuchi Kazuhiko

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• C01B31/0206 Primary

  Chemistry & Metallurgy · mapped topic

• H01G11/28

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• Y10T428/2991

  Coated · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title