Preparation method and application of carbon-based copper-cobalt oxide nanosheet catalyst

Abstract

The invention discloses a preparation method of a carbon-based copper-cobalt oxide nanosheet catalyst and application to oxygen evolution by electrolyzing water based on the catalyst, and belongs to the technical fields of nano catalysis, nano materials and metal-organic framework (MOF) materials. The preparation method comprises the following main steps of blending an aspartic acid alkaline solution with a copper nitrate-cobalt nitrate solution at a room temperature, generating a sediment at the room temperature, carrying out suction filtration, and drying, so that a Cu-MOF nano fiber loaded Co(II) ion, namely a CuCo-MOF nano fiber, is prepared; heating the CuCo-MOF nano fiber in an air atmosphere, so that the carbon-based copper-cobalt oxide nanosheet catalyst is prepared. The cost of raw materials used for the preparation of the catalyst is low; the preparation process is simple; the reactive energy consumption is low; the carbon-based copper-cobalt oxide nanosheet catalyst has an industrial application prospect. The catalyst is used for efficiently catalyzing and hydrolyzing the water for the oxygen evolution and has favorable oxygen-evolution electrocatalytic activity and electrochemical stability.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon-based copper-cobalt oxide nanosheet catalyst, and belongs to the technical fields of nano-catalysis, nano-materials, and metal-organic framework materials. Background technique [0002] Due to the severe environmental pollution caused by fossil fuels, the preparation of sustainable clean and green energy has become an important frontier research field. As we all know, water is one of the most abundant resources containing hydrogen and oxygen elements on the earth. Water is decomposed to generate hydrogen and oxygen, and hydrogen is converted into water after exothermic combustion. This process is regenerative, clean and green. Electrocatalytic direct water splitting to produce hydrogen and oxygen is considered the most efficient way to achieve this process. The electrocatalytic water splitting reaction includes two half-reactions, hydrogen evolution reaction (HER) and oxygen evo...

AI Technical Summary

Problems solved by technology

Although there are many types of MOFs, the number of MOFs precursors for electrocatalysts that are easy to prepare and transform into controllable forms is limited. At present, the preparation of oxygen evolution catalysts using three-dimensional (3D) MOFs microcrystals or nanocrystals as precursors has been reported. To the best of our knowledge, the preparation of oxygen evolution catalysts based on 1D MOFs nanofibers has not been reported

[0005] The cobalt element is abundant in the earth, and its oxide is cheap. However, the bulk cobalt oxide has poor conductivity and its electrocatalytic oxygen evolution activity is also poor.