Metal-oxide anchored graphene and carbon-nanotube hybrid foam

Patent metadata

Field	Value
Publication number	US-10580591-B2
Application number	US-201315034400-A
Country	US
Kind code	B2
Filing date	Nov 5, 2013
Priority date	Nov 5, 2013
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A metal oxide anchored graphene and carbon nanotube hybrid foam can be formed via a two-step process. The method can include forming at least one graphene layer and a plurality of carbon nanotubes onto a surface of a porous metal substrate by chemical vapor deposition to form a coated porous metal substrate, and depositing a plurality of metal oxide nanostructures onto a surface of the coated porous metal substrate to form the metal oxide anchored graphene and carbon nanotube hybrid foam.

First claim

The claimed invention is:

1. An energy device, comprising
a porous metal substrate;
at least one graphene layer deposited onto a surface of the porous metal substrate;
a plurality of carbon nanotubes grown onto a surface of the at least one graphene layer; and
a plurality of hydrous ruthenium (IV) oxide nanowires deposited onto the plurality of carbon nanotubes.

2. The energy device of any one claim 1 , wherein the porous metal substrate includes at least of copper, aluminum, and nickel.

3. The energy device of claim 1 , wherein the energy device does not include a binder.

4. The energy device of claim 1 , wherein the at least one graphene layer includes less than twenty graphene layers.

5. The energy device of claim 1 , wherein a loading mass of the energy device is within a range of about 0.0005 grams to about 0.1 grams.

6. The energy device of claim 5 , wherein the loading mass is determined by a difference between a mass of a post-loaded porous metal substrate and a mass of pre-loaded porous metal substrate.

7. The energy device of claim 6 , wherein the post-loaded porous metal substrate includes the porous metal substrate, the at least one graphene layer, the plurality of carbon nanotubes, and the plurality of metal oxide nanowires and the pre-loaded porous metal substrate includes the porous metal substrate.

8. A supercapacitor, comprising:
a first electrode including:
a first porous metal substrate,
at least one graphene layer deposited onto a surface of the first porous metal substrate,
a plurality of carbon nanotubes grown onto a surface of the at least one graphene layer, and
a plurality of metal oxide nanowires deposited onto the plurality of carbon nanotubes;
a second electrode, including:
a second porous metal substrate,
at least one graphene layer deposited onto a surface of the second porous metal substrate,
a plurality of carbon nanotubes grown onto at least one of a surface of the at least one graphene layer, and
a plurality of hydrous ruthenium (IV) oxide nanowires deposited onto the plurality of carbon nanotubes;
an electrolyte; and
a separator positioned between the first electrode and the second electrode.

9. The supercapacitor of claim 8 , wherein the first porous metal substrate and the second porous metal substrate includes at least one of copper, aluminum, and nickel.

10. The supercapacitor of claim 8 , wherein the at least one graphene layer includes twenty graphene layers or less.

11. The supercapacitor of claim 8 , wherein the first electrode and the second electrode do not include a binder.

12. A method, comprising:
growing at least one graphene layer onto a surface of a porous metal substrate using chemical vapor deposition;
growing a plurality of carbon nanotubes onto a surface of the at least one graphene layer using chemical vapor deposition to form a coated porous metal substrate; and
depositing a plurality of hydrous ruthenium (IV) oxide nanowires onto a surface of the plurality of carbon nanotubes to form a hybrid foam.

13. The method of claim 12 , wherein, prior to growing the at least one graphene and the plurality of carbon nanotubes, the method comprises:
applying a reactive ion etching plasma to the porous metal surface; and
depositing catalyst particles onto the surface of the porous metal surface.

14. The method of claim 12 , comprising treating e coated porous metal substrate with ultraviolet-generated ozone for a time period.

15. The method of claim 12 , comprising:
drying the hybrid foam at a first temperature for a first time period; and
annealing the hybrid foam at a second temperature for a second time period.

Assignees

• Univ California
• The Regents Of California Riverside

Inventors

• Wang Wei
• Guo Shirui
• Ozkan Cengiz S
• Ozkan Mihrimah

Classifications

• C01B32/186

  by chemical vapour deposition [CVD] · CPC title

• C01P2004/16

  Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer · CPC title

• C01P2004/13

  Nanotubes · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01G55/004

  Oxides; Hydroxides · CPC title