Trimetallic layered double hydroxide composition

Patent metadata

Field	Value
Publication number	US-2021348284-A1
Application number	US-201917268424-A
Country	US
Kind code	A1
Filing date	Aug 16, 2019
Priority date	Aug 16, 2018
Publication date	Nov 11, 2021
Grant date	—

Abstract

The invention relates to a layered double hydroxide (LDH) material and methods for using the LDH material to catalyse the oxygen evolution reaction (OER) in a water-splitting process. The invention also provides a composition, a catalytic material, an electrode and an electrolyser including the LDH material. In particular, the LDH material includes a metal composite including cobalt, iron, chromium and optionally nickel species interspersed with a hydroxide layer.

First claim

1 . A layered double hydroxide material comprising a metal composite comprising cobalt, iron and chromium species interspersed with a hydroxide layer.

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

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

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

5 . The layered double hydroxide material of claim 1 , wherein the metal composite comprises cobalt and iron in a ratio of 1.5 to 3.5:1 cobalt:iron on a weight for weight basis

6 .- 7 . (canceled)

8 . The layered double hydroxide material of claim 1 , wherein the metal composite possesses a spherical morphology.

9 . The layered double hydroxide material of claim 8 , wherein the spherical morphology comprises a plurality of microspheres.

10 . The layered double hydroxide material of claim 9 , wherein the average diameter of the microspheres is monodisperse.

11 . The layered double hydroxide material of claim 10 , wherein the monodisperse microspheres have an average diameter of about 100 to about 300 nm.

12 . The layered double hydroxide material of claim 1 , wherein the hydroxide layer is a mixed phase of amorphous hydroxide and Co based spinel oxides.

13 . The layered double hydroxide material of claim 1 , wherein the metal composite further comprises a nickel species.

14 . A catalytic material comprising the layered double hydroxide material of claim 1 and optionally a substrate.

15 . The catalytic material of claim 14 , wherein the catalytic material is in the form of nanodots.

16 . An electrode comprising a conductive substrate and a catalytic material coated onto a surface of the conductive substrate, the catalytic material comprising the layered double hydroxide material of claim 1 .

17 . The electrode of claim 16 , wherein the conductive substrate is a metal foam.

18 . (canceled)

19 . A process for preparing the catalytic material of claim 14 , the process comprising contacting a conductive substrate with a solution comprising cobalt, iron and chromium ions, and applying a voltage across the substrate and a counter electrode through the solution to electrodeposit a composite material comprising cobalt, iron and chromium species on the substrate.

20 . A process for preparing the catalytic material of claim 14 , comprising treating a solution of cobalt ions, iron ions and chromium ions to a temperature between about 150° C. and about 220° C. for between about 8 to about 20 hours, cooling the mixture and collecting the product.

21 . (canceled)

22 . A method of evolving oxygen from water, the method comprising providing an electrochemical cell comprising an anode, a cathode and an electrolyte solution, contacting water with the anode and the cathode, and applying a voltage across the anode and the cathode, wherein the anode comprises the layered double hydroxide material of claim 1 .

23 . The method of claim 22 , wherein the anodic voltage provides an overpotential of about 200 mV to about 500 mV.

24 . (canceled)

25 . An electrolyser comprising an anode, a cathode and a power supply, wherein the anode comprises the layered double hydroxide material of claim 1 .

26 . (canceled)

Assignees

• Newsouth Innovations Pty Ltd
• Kohodo Hydrogen Energy Pty Ltd

Inventors

• Zhao Chuan
• Bo Xin

Classifications

• C01P2004/32

  Spheres · CPC title

• B01J23/005

  Spinels · CPC title

• B01J35/73

  having a two-dimensional [2D] layered crystalline structure, e.g. layered double hydroxide [LDH] · CPC title

• B01J35/33

  Electric or magnetic properties · CPC title

• B01J35/45

  Nanoparticles · CPC title