A transition metal hydroxyl oxide / cobalt oxide heterojunction electrocatalyst, its preparation method, and its water electrolysis electrode.

By constructing a transition metal hydroxyl oxide/cobalt oxide heterojunction and controlling the direction and intensity of the built-in electric field, the problem of insufficient activity and stability of NiFeOOH catalyst under high current density was solved, and efficient oxygen evolution reaction and improved water electrolysis performance were achieved.

CN122128754APending Publication Date: 2026-06-02CHONGQING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING NORMAL UNIVERSITY
Filing Date
2026-04-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing nickel-iron hydroxyl oxide (NiFeOOH) catalysts have insufficient activity and stability at high current densities and cannot effectively regulate the built-in electric field (BIEF), resulting in limited performance of the oxygen evolution reaction (OER).

Method used

A transition metal hydroxyl oxide/cobalt oxide heterojunction was constructed. By controlling the electronic state of cobalt oxide, the direction and intensity of the built-in electric field (BIEF) were precisely controlled, forming a structure with an electron-rich cobalt oxide core and a transition metal hydroxyl oxide shell.

Benefits of technology

It significantly improves catalytic activity and stability, lowers the energy barrier of oxygen evolution reaction, and enhances the efficiency of hydrogen production through water electrolysis, thus realizing a high-performance and long-life non-precious metal electrocatalyst.

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Abstract

This invention discloses a transition metal hydroxyl oxide / cobalt oxide heterojunction electrocatalyst. The electrocatalyst is a heterojunction formed with an electron-rich cobalt oxide nanoarray as the core and a transition metal hydroxyl oxide as the shell. The heterojunction has a built-in electric field at the interface. By controlling the electronic state of the cobalt oxide, the direction and intensity of the built-in electric field at the interface can be precisely controlled to enhance the oxygen evolution reaction activity. By constructing a heterojunction using cobalt oxide and NiFeOOH, the direction and intensity of the built-in electric field at the interface can be precisely controlled by controlling the electronic state of cobalt ions in the cobalt oxide. This results in the heterojunction having the lowest reaction energy barrier, improving the performance of the anodic oxygen evolution reaction (OER) and water electrolysis, and maximizing the catalytic activity.
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