Electrocatalytic materials for oxygen evolution of formula A1-xBxO3-δ

Patent metadata

Field	Value
Publication number	US-11142837-B2
Application number	US-201916584004-A
Country	US
Kind code	B2
Filing date	Sep 26, 2019
Priority date	Sep 28, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

Electrocatalysts of formula Al−x,BxO3−δ, wherein A=a metal with an acid-stable oxide and B=a platinum-group-metal (PGM), are provided, as are methods of making the electrocatalysts via rapid plasma oxidation, methods of using the electrocatalysts to catalyze e.g. oxygen evolution reactions (OERs), and devices comprising the electrocatalysts.

First claim

We claim:

1. An electrocatalytic material with formula A 1−x B x O 3−δ . wherein
A=a metal with an acid-stable oxide,
B=a platinum-group-metal (PGM),
x ranges from 0.00000001 to 0.5, inclusive, and
δ represents the number of vacancies in the crystal lattice.

2. The electrocatalytic material of claim 1 , wherein B is ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt), or a mixture of two or more of these.

3. The electrocatalytic material of claim 2 , wherein B is Ru or Ir.

4. The electrocatalytic material of claim 1 , wherein A is tungsten (W), tantalum (Ta) or titanium (Ti).

5. A method of making an electrocatalytic material of claim 1 , comprising
positioning, on a substrate, a mixture comprising a liquid medium and i) a source of a metal with an acid-stable oxide and ii) a source of a platinum-group-metal (PGM); and
exposing the mixture to an oxidizing non-equilibrium plasma for a period of time sufficient to form the electrocatalytic material.

6. The method of claim 5 , wherein the PGM is ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt), or a mixture of two or more of these.

7. The method of claim 6 , wherein the PGM is Ir, Ru or Pt.

8. The method of claim 5 , wherein the metal with an acid-stable oxide is tungsten (W), tantalum (Ta) or titanium (Ti).

9. The method of claim 8 , wherein the metal with an acid-stable oxide is W.

10. The method of claim 7 , wherein the PGM is Ir.

11. The method of claim 5 , wherein the oxidizing non-equilibrium plasma comprises an inert gas and oxygen.

12. The method of claim 9 , wherein the inert gas is argon or helium.

13. The method of claim 11 , wherein the oxidizing non-equilibrium plasma further comprises hydrogen.

14. A method of catalyzing an oxygen evolution reaction (OER), comprising
contacting water with the electrocatalytic material of claim 1 ,
wherein the step of contacting is performed under conditions that permit catalysis of the OER by the electrocatalytic material.

15. The method of claim 14 , wherein the conditions that permit catalysis include performing the step of contacting under strongly acidic conditions.

16. A device comprising the electrocatalytic material of claim 1 .

17. The device of claim 15 , which is an electrolyzer.

18. The electrocatalytic material of claim 1 wherein x ranges from 0.00000001 to 0.01.

Assignees

• Univ Louisville Res Found Inc

Inventors

• Spurgeon Joshua
• Sunkara Mahendra K

Classifications

• C25B1/04 Primary

  by electrolysis of water · CPC title

• C01G55/004

  Oxides; Hydroxides · CPC title

• C25B11/075 Primary

  consisting of a single catalytic element or catalytic compound · CPC title

• Y02E60/36

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