Pseudocapacitive electrodes and methods of forming

Patent metadata

Field	Value
Publication number	US-2016293346-A1
Application number	US-201514871010-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Apr 5, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Pesudocapacitive electrodes having improved electrochemical properties for energy storage systems, and methods for their manufacture. The pseudocapacitive electrode may include a porous substrate and a nanoscale structure having an array of nanoneedles or an array of nanopetals located on the substrate. The nanoscale structure includes a bi- or tri-metal oxide or a bi- or tri-metal hydroxide.

First claim

1 . A pseudocapacitive electrode comprising a tri-metal oxide or a tri-metal hydroxide.

2 . A pseudocapacitive electrode comprising:
a porous substrate; a nanoscale structure comprising an array of nanoneedles or an array of nanopetals located on the substrate, the nanoscale structure comprises a bi- or tri-metal oxide or a bi- or tri-metal hydroxide.

3 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises an array of nanoneedles and the substrate comprises a foam material.

4 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises an array of nanopetals and the substrate comprises a free-standing graphene nanopetal foam.

5 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises an array of nanoneedles and the substrate comprises a carbon cloth.

6 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises an array of nanoneedles and the substrate comprises an array of graphitic nanopetals located on a carbon cloth.

7 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises a bi-metal oxide or a bi-metal hydroxide.

8 . The pseudocapacitive electrode of claim 2 , wherein the nanoscale structure comprises a tri-metal oxide or a tri-metal hydroxide.

9 . A method of forming a pseudocapacitive electrode, the method comprising:
providing a porous substrate; and then forming a nanoscale structure comprising an array of nanoneedles or an array of nanopetals on the substrate, the nanoscale structure comprising a bi- or tri-metal oxide or a bi- or tri-metal hydroxide.

10 . The method of claim 9 , wherein the step of forming the nanoscale structure on the substrate comprises forming an array of nanoneedles on a surface of the substrate.

11 . The method of claim 10 , wherein the array of nanoneedles is formed using a hydrothermal deposition process.

12 . The method of claim 9 , wherein the step of forming the nanoscale structure on the substrate comprises forming an array of nanopetals on a surface of the substrate.

13 . The method of claim 12 , wherein the array of nanopetals is formed using a electrodeposition process.

14 . The method of claim 9 , wherein the substrate is a foam material and the step of forming the nanoscale structure on the substrate comprises forming an array of nanoneedles on a surface of the substrate using a hydrothermal process.

15 . The method of claim 9 , wherein the substrate comprises a free-standing graphene nanopetal foam and the step of forming the nanoscale structure on the substrate comprises growing an array of nanopetals on a surface of the substrate using an electrodeposition process.

16 . The method of claim 9 , wherein the substrate comprises graphite nanopetals formed on a carbon cloth material and the step of forming the nanoscale structure on the substrate comprises growing an array of nanoneedles on a surface of the substrate using a hydrothermal process.

17 . The method of claim 9 , wherein the step of providing the porous substrate comprises:
growing an array of graphitic nanopetals on a foam template via microwave plasma chemical vapor deposition; and then chemically dissolving the foam template to produce a free-standing graphene nanopetal foam.

18 . The method of claim 17 , wherein the step of forming the nanoscale structure on the substrate comprises forming an array of nanopetals on the graphitic nanopetals of the free-standing graphene nanopetal foam using an electrodeposition process.

19 . The method of claim 9 , wherein the step of providing the porous substrate comprises forming an array of graphitic nanopetals on a carbon cloth material.

20 . The method of claim 19 , wherein the step of forming the nanoscale structure on the substrate comprises forming an array of nanoneedles on the graphitic nanopetals using a hydrothermal process.

Assignees

• Purdue Research Foundation

Inventors

• Xiong Guoping
• Fisher Timothy Scott

Classifications

• C30B30/02

  using electric fields, e.g. electrolysis · CPC title

• H01G11/24 Primary

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title

• C30B7/10

  by application of pressure, e.g. hydrothermal processes · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• C30B29/22

  Complex oxides · CPC title