Metal-oxide anchored graphene and carbon-nanotube hybrid foam

Patent metadata

Field	Value
Publication number	US-2016268061-A1
Application number	US-201315034400-A
Country	US
Kind code	A1
Filing date	Nov 5, 2013
Priority date	Nov 5, 2013
Publication date	Sep 15, 2016
Grant date	—

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 metal oxide nanostructures deposited onto at least one of a surface of the plurality of carbon nanotubes and the surface of the at least one graphene layer.

2 . The energy device of claim 1 , wherein the plurality of metal oxide nanostructures includes at least one of ruthenium (IV) oxide and manganese (IV) oxide.

3 . The energy device of claim 1 , wherein the plurality of metal oxide nanostructures includes at least one of ruthenium (IV) oxide nanoparticles, ruthenium (IV) oxide nanoplates, ruthenium (IV) oxide nanospheres, and ruthenium (IV) oxide nanowires.

4 . The energy device of claim 1 , wherein the plurality of metal oxide nanostructures includes at least one of manganese (IV) oxide nanowires, manganese (IV) oxide nanoparticles, manganese (IV) oxide nanospheres, and manganese (IV) oxide nanoplates.

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

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

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

8 . 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.

9 . The energy device of claim 8 , 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.

10 . The energy device of claim 9 , 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 nanostructures and the pre-loaded porous metal substrate includes the porous metal substrate.

11 . 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 nanostructures deposited onto at least one of a surface of the plurality of carbon nanotubes and the surface of the at least one graphene layer;
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 metal oxide nanostructures deposited onto at least one of a surface of the plurality of carbon nanotubes and the surface of the at least one graphene layer;
an electrolyte; and a separator positioned between the first electrode and the second electrode.

12 . The supercapacitor of claim 11 , wherein the first porous metal substrate and the second porous metal substrate includes at least one of copper, aluminum, and nickel.

13 . The supercapacitor of claim 11 , wherein the plurality of metal oxide nanostructures includes at least one of ruthenium (IV) oxide and manganese (IV) oxide.

14 . The supercapacitor of claim 11 , wherein the at least one graphene layer includes twenty graphene layers or less.

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

16 . 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 metal oxide nanostructures onto a surface of the coated porous metal substrate to form a hybrid foam.

17 . The method of claim 16 , wherein, prior to growing the at least one graphene layer 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.

18 . The method of claim 16 , comprising treating the coated porous metal substrate with ultraviolet-generated ozone for a time period.

19 . The method of claim 16 , wherein depositing the plurality of metal oxide nanostructures includes submerging the coated porous metal substrate into one of a first solution including hydrous ruthenium (IV) oxide nanostructures and deionized water and a second solution including alpha-manganese (IV) oxide nanostructures and ethanol.

20 . The method of claim 16 , 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

Inventors

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

Classifications

• C01G55/004

  Oxides; Hydroxides · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/04

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

• C01P2004/13

  Nanotubes · CPC title