Bifunctional Oxygen Electrocatalyst, Preparation Method and Use Thereof

Patent metadata

Field	Value
Publication number	US-2022190357-A1
Application number	US-202117497034-A
Country	US
Kind code	A1
Filing date	Oct 8, 2021
Priority date	Dec 14, 2020
Publication date	Jun 16, 2022
Grant date	—

Abstract

A bifunctional oxygen electrocatalyst, a preparation method and use thereof are disclosed. The bifunctional oxygen electrocatalyst is represented by A1-x-yBxCyO2, wherein element A is one selected from the group consisting of Pt, Ir, Ru, and Pd, and each of element B and element C is selected from the group consisting of Mo, Mn, Fe, Co, Ni, Cu and Zn; the bifunctional oxygen electrocatalyst is a three-dimensional porous foam sheet catalyst; optionally, the element B is the same as the element.

First claim

What is claimed is:

1 . A bifunctional oxygen electrocatalyst, which is represented by A 1-x-y B x C y O 2 , wherein
element A is one selected from the group consisting of Pt, Ir, Ru, and Pd; each of element B and element C is selected from the group consisting of Mo, Mn, Fe, Co, Ni, Cu, and Zn; the bifunctional oxygen electrocatalyst is a three-dimensional porous foam sheet catalyst; and optionally, the element B is the same as the element C.

2 . The bifunctional oxygen electrocatalyst as claimed in claim 1 , wherein taking the sum of atomic percentages of the element A, the element B and the element C in the bifunctional oxygen electrocatalyst as 100 at. %, the sum of atomic percentages of the element B and the element C is less than or equal to 60 at. %.

3 . A method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 1 , comprising
1) mixing a metal salt of the element A, a metal salt of the element B, a metal salt of the element C with a carbohydrate and a gas generating compound uniformly in water to form a precursor solution; and 2) pre-sintering the precursor solution, and calcining the product obtained after pre-sintering to obtain the bifunctional oxygen electrocatalyst.

4 . The method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 3 , wherein the carbohydrate is one or more selected from the group consisting of chitosan, sucrose, fructose, glucose, maltose, cellulose, starch, hemicellulose, mannose, fructan, xylitol, arabinose, erythrose, sorbitol, xylitol, and Helianthus tuberosus.

5 . The method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 3 , wherein the gas generating compound is one or more selected from the group consisting of thiourea, ammonium chloride, urea, and ammonium sulfate.

6 . The method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 3 , wherein in step 1), a concentration of the carbohydrate in the precursor solution is in the range of 0.1-10 mol/L, and preferably 2-8 mol/L;
optionally, a concentration of the gas generating compound in the precursor solution is in the range of 0.1-10 mol/L, and preferably 2-8 mol/L; and optionally, in the precursor solution, the sum of concentrations of the metal salt of the element A, the metal salt of the element B, and the metal salt of the element C is in the range of 0.01-1 mol/L, and preferably 0.01-0.1 mol/L.

7 . The method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 3 , wherein the pre-sintering in step 2) is performed at a temperature of 30-300° C., and preferably 100-200° C.; and
optionally, the pre-sintering is performed for 0.1-100 h, and preferably 1-20 h.

8 . The method for preparing the bifunctional oxygen electrocatalyst as claimed in claim 3 , wherein the calcining in step 2) is performed at a temperature of 100-800° C., and preferably 300-700° C.; and
optionally, the calcining is performed for 0.1-100 h, and preferably 1-20 h.

9 . A method for catalyzing an electrocatalytic oxygen reduction reaction or oxygen evolution reaction, comprising using the bifunctional oxygen electrocatalyst as claimed in claim 1 as a catalyst.

Assignees

• Univ Tsinghua

Inventors

• Zhang Rufan
• Zhou Chenhui
• Meng Haibing
• Han Ying

Classifications

• Y02E60/50

  Fuel cells · CPC title

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M4/923 Primary

  Compounds thereof with non-metallic elements · CPC title

• C01G55/00 Primary

  Compounds of ruthenium, rhodium, palladium, osmium, iridium, or platinum · CPC title

• H01M2004/8689

  Positive electrodes · CPC title