Laser preparation method of CoOOH nanosheet with rich oxygen vacancies

Abstract

The invention provides a laser preparation method of a CoOOH nanosheet with rich oxygen vacancies. The laser preparation method comprises the following steps of: carrying out surface treatment on a metal cobalt target; placing the metal target in alkaline solution well-blended in advance, and utilizing nanosecond laser to irradiate for 20 minutes under room temperature till the solution is changedinto brown sol; using deionized water to wash the brown sol multiple times, then freezing and drying for 24 hours and obtaining the CoOOH nanosheet with rich oxygen vacancies. The laser preparation method provided by the invention has the beneficial effects that the metal target is used as a precursor, the type is simple, no catalyst is used in the synthetic process, the process is fast and environment-friendly, and side products are fewer, so that the catalytic activity and the conductivity of the material are improved; the method is mild, and can be finished under room temperature; comparedwith the traditional synthetic method, the method realizes great reduction of energy consumption and danger in synthesis; the CoOOH nanosheet is wide in application and is applicable to synthesis ofvarious materials; therefore, the development of the laser liquid-phase method for synthesizing the nano material with rich oxygen vacancies in an environment-friendly, fast and high-efficiency mannerconforms to the needs of the current society for low energy consumption and low pollution in material synthesis.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a laser preparation method of CoOOH nanosheets with rich oxygen vacancies. Background technique [0002] Due to the slow kinetics of the electrochemical oxygen evolution reaction, the large overpotential is the bottleneck of electrochemical water splitting and metal-air batteries. Therefore, it is of great significance to study and develop high-performance catalysts for the electrochemical oxygen evolution reaction. Precious metal commercial catalysts have attracted extensive attention due to their excellent performance, but their wide application is limited due to their high cost. Transition metal oxyhydroxides such as CoOOH have excellent performance in alkaline environments. However, CoOOH currently has problems such as low catalytic activity and poor electrical conductivity, and its oxygen evolution performance is still difficult to match that of noble metal catalysts. T...

AI Technical Summary

Problems solved by technology

At present, the introduction methods of oxygen vacancies are mainly atmosphere reduction under high temperature conditions, liquid phase reduction method, plasma reduction method and reducing agent reduction method. In the synthesis process, there are synthesis methods such as high temperature, high pressure, and the use of explosive reducing gases. The traditional synthetic method of introducing oxygen vacancies inevitably brings high energy consumption and dangerous defects, as well as by-products caused by reducing agents, which ultimately reduce the catalytic activity of the material.

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