A preparation method of composite electrocatalytic material for alkaline electrocatalytic hydrogen evolution

Abstract

A method for preparing a composite electrocatalytic material for alkaline electrocatalytic hydrogen evolution, which method grows a layer of Ni(OH) on carbon fiber paper 2 Nanosheet structure; a titanium oxide layer is coated on the surface by vacuum electroplating; and then placed in a muffle furnace at a temperature of 360 degrees in an air atmosphere to anneal and crystallize to obtain TiO 2 -Ni(OH) 2 @CFP composite structural material; the TiO 2 -Ni(OH) 2 @CFP controlled different coating times under vacuum conditions, and after annealing and crystallization in an air atmosphere, composite electrocatalytic materials were obtained after coating for different times. The present invention uses CFP as the base material of the catalyst, which increases the surface area of ​​the composite electrode, facilitates mass transfer and improves the electrochemical activity of the electrode; at the same time, hydrothermal growth of Ni(OH) on the base material 2 , reducing the cost and making Ni(OH) 2 It is more firmly combined with the base material and evenly distributed to improve the stability of the catalyst. The present invention introduces TiO 2 It plays a great role in improving the catalytic performance of the catalyst and reducing the hydrogen evolution overpotential; achieving a significant improvement in the electrocatalytic hydrogen evolution activity.

Description

technical field [0001] The invention relates to a preparation method of a composite electrocatalytic material for alkaline electrocatalytic hydrogen evolution, belonging to the technical field of electrocatalysis. Background technique [0002] The excessive consumption of fossil resources and the resulting environmental pollution force us to develop and utilize renewable clean energy that can replace fossil fuels. As a clean, efficient, safe and sustainable new energy, hydrogen energy is regarded as the most promising clean energy in the 21st century. Hydrogen production by electrolysis of water is an effective way to solve the current dilemma. However, the existence of overpotential in the process of water electrolysis leads to high energy consumption in electrolysis of water. Therefore, we need to develop highly active hydrogen evolution reaction catalysts to reduce the overpotential of water splitting reaction, thereby improving energy conversion efficiency. Ideal water...

AI Technical Summary

Problems solved by technology

Most of the current HER electrocatalysts are more efficient in acidic conditions than in alkaline conditions, because the HER process of electrocatalysts is less efficient in alkaline media, which is related to the slow dissociation process of water on the surface of the electrocatalyst, but the electrolysis of water in alkaline Alkaline electrolytes have the advantages of easy availability and long-lasting performance when carried out in electrolyzers. However, the current research on promoting water dissociation in alkaline electrolytes has increased, but the performance of synthesized composites is still unsatisfactory. , compared with noble metal-based electrocatalysts, there is still a large gap, so the development of high-performance electrocatalysts is still a great challenge

[0003] Nickel-based layered hydroxide has a controllable composition and structure. It has been continuously proved by researchers that its electrolytic water activity has been improved after being combined with other materials. The nickel-based layered hydroxide has poor electrocatalytic hydrogen evolution performance. Poor stability, short service life, poor conductivity, difficult to recycle, high cost of raw materials for preparation, and serious environmental pollution during the preparation process need to be solved urgently

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