Trimetallic layered double hydroxide composition

Patent metadata

Field	Value
Publication number	US-2022002887-A1
Application number	US-201817291097-A
Country	US
Kind code	A1
Filing date	Nov 5, 2018
Priority date	Nov 5, 2018
Publication date	Jan 6, 2022
Grant date	—

Abstract

A layered double hydroxide (LDH) material, methods for using the LDH material to catalyse the oxygen evolution reaction (OER) in a water-splitting process and methods for preparing the LDH material. The LDH material includes nickel, iron and chromium species and possesses a sheet-like morphology including at least one hole.

First claim

1 . A layered double hydroxide material comprising a metal composite comprising nickel, iron and chromium species interspersed with a hydroxide layer, wherein the layered double hydroxide material is in the form of a sheet comprising at least one hole.

2 . The layered double hydroxide material of claim 1 , wherein the sheet comprising at least one hole is a nanomesh.

3 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises Ni 2+ and/or Ni 3+ .

4 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises Fe 2+ and/or Fe 3+ .

5 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises Cr 3+ and/or Cr 6+ .

6 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises nickel and iron in a ratio of about 1:1 to about 10:1 on a molar basis.

7 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises nickel and chromium in a ratio of about 2:1 to about 10:1 on a molar basis.

8 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises iron and chromium in a ratio of about 10:1 to about 100:1 on a molar basis.

9 . The layered double hydroxide material of claim 1 , wherein the diameter of the at least one hole is from about 2 nm to about 10 nm.

10 . A catalytic material comprising the LDH material of claim 1 .

11 . An electrode, comprising a conductive substrate and a catalytic material coated onto a surface of the conductive substrate, the catalytic material comprising the LDH material of claim 1 .

12 . A process for preparing the catalytic material of claim 10 , the process comprising:
contacting a conductive substrate with a solution comprising nickel, iron and chromium precursors, applying a voltage across the substrate and a counter electrode through the solution to electrodeposit a composite material comprising nickel, iron and chromium species on the substrate in the form of a sheet, and processing the electrodeposited composite material to form one or more holes.

13 . The process of claim 12 , wherein the processing step comprises removing a portion of the chromium species from the electrodeposited composite material.

14 . The process of claim 12 , wherein the processing step comprises etching the electrodeposited composite material through contact with an etching solution and applying a second voltage across the substrate and the counter electrode.

15 . The process of claim 12 , wherein the voltage applied across the substrate and counter electrode has a constant current.

16 . The process of claim 12 , wherein the substrate and counter electrode are electrodes of a two-electrode electrolytic system.

17 . A method of evolving oxygen from water, the method comprising providing an electrochemical cell comprising at least two electrodes and a container for an electrolyte solution, contacting water with the at least two electrodes, and applying a voltage across the at least two electrodes, wherein at least one of the at least two electrodes comprises the layered double hydroxide material of claim 1 .

18 . An electrolyser, comprising at least two electrodes and a power supply, wherein at least one of the at least two electrodes comprises the layered double hydroxide material of claim 1 .

19 . The catalytic material of claim 10 , further comprising a substrate.

Assignees

• Newsouth Innovations Pty Ltd
• Kohodo Hydrogen Energy Pty Ltd

Inventors

• Zhao Chuan
• Bo Xin

Classifications

• Y02P20/133

  Renewable energy sources, e.g. sunlight · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• B01J23/007

  Mixed salts · CPC title

• C01G37/006

  Compounds containing chromium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2002/22

  layered hydroxide-type, e.g. of the hydrotalcite-type · CPC title