Preparation method and application of difunctional electrocatalyst

Abstract

The invention discloses a preparation method and application of a bifunctional electrocatalyst, and belongs to the technical field of electrocatalytic materials. According to the technical scheme, the preparation method is characterized in that an MOF precursor is introduced into a high-conductivity one-dimensional carrier shell layer in situ and then is stably compounded with a metal current collector, then electrochemical in-situ activation is carried out, and finally the OER / HER bifunctional electrocatalyst is prepared. The nano bifunctional electrocatalyst prepared by the invention has a multi-stage assembly structure and a multi-dimensional material composite structure characteristic, is beneficial to improving the electrocatalytic activity of the bifunctional electrocatalyst OER / HER and prolonging the service life of the bifunctional electrocatalyst OER / HER, and has a relatively good application prospect in catalysis of water splitting.

Description

technical field [0001] The invention belongs to the technical field of bifunctional electrocatalyst materials, and in particular relates to a preparation method and application of a bifunctional electrocatalyst. Background technique [0002] With global warming, energy crisis and worsening environmental pollution, it is urgent to find clean and renewable energy that can replace traditional fossil energy. Hydrogen energy, as an environmentally benign, high-calorific-value fuel and secondary energy source, is attracting growing research interest in the fields of chemistry, materials, and energy sciences. Electrocatalytic water splitting is recognized as one of the sustainable approaches to efficiently deliver pollution-free and renewable energy hydrogen. The electrocatalytic water splitting device that generates hydrogen at the cathode and oxygen at the anode is a promising clean energy continuous power generation technology. Electrocatalytic water splitting consists of an ox...

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Problems solved by technology

However, since the MOF material is composed of metal ions and organic ligands, and the metal sites are embedded by the organic ligands, the surface of the MOF material is non-polar to a certain extent, while the surface of the metal current collector is polar. There are significant differences in objective surface properties between MOF materials, which lead to inevitable aggregation and desorption of MOF materials in the derivation process and catalytic working environment, especially under the impact of bubbles generated by oxygen evolution reaction and hydrogen evolution reaction. occur, thereby reducing the number of catalytically active sites in the catalytic material

Moreover, although the metal current collector provides excellent electron conductivity for supporting electrocatalytic materials at the macro level, due to the non-conductivity of the MOF material itself, the local charge transport is still limited, which limits the state of the electrochemical reaction.

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