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High-efficiency hydrogen evolution catalyst and preparation method thereof

A catalyst and hydrogen evolution technology, applied in the field of electrolysis of water, can solve the problems of poor catalytic performance, slow interface reaction kinetics, poor conductivity, etc., achieve low cost, low hydrogen evolution overpotential, and improve electrocatalytic performance

Inactive Publication Date: 2019-11-12
CHANGZHOU UNIV
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Problems solved by technology

However, molybdenum carbide alone has limited its hydrogen evolution performance due to its inherent shortcomings such as poor electrical conductivity and slow interfacial reaction kinetics, and its catalytic performance is far inferior to that of Pt-based catalysts.

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  • High-efficiency hydrogen evolution catalyst and preparation method thereof
  • High-efficiency hydrogen evolution catalyst and preparation method thereof
  • High-efficiency hydrogen evolution catalyst and preparation method thereof

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Embodiment Construction

[0023] The technology and characteristics of the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings, but these embodiments are not intended to limit the protection scope of the present invention.

[0024] A high-nitrogen-doped carbon-coated nickel-molybdenum catalyst with a ratio of 5:2 for electrohydrogen evolution was prepared by high-temperature calcination and carbonization. Improving its electrocatalytic performance, including the following steps:

[0025] Step 1) Prepare a mixed aqueous solution of chitosan and ethylenediamine with a molar ratio of 0.1:1, and stir continuously at a constant temperature until the mixture is uniform;

[0026] Step 2) Mix ammonium molybdate tetrahydrate, nickel chloride hexahydrate and trimesic acid solution with a molar ratio of 1:0.5, and slowly add this solution dropwise to the mixed solution containing ethylenediamine in step 1) , stir until evenly mixed;

[0...

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Abstract

The invention discloses a high-efficiency hydrogen evolution catalyst and a preparation method thereof. The preparation method is characterized by comprising the following steps: with chitosan as a carbon source, trimesic acid as an organic ligand, ethylenediamine as a nitrogen source, ammonium molybdate tetrahydrate as a molybdenum source and an iron-based metal (iron, cobalt or nickel) salt as adoping metal source, carrying out uniform mixing and a sufficient reaction; and then performing one-step high-temperature pyrolysis to realize nitridation and carbonization so as to prepare the high-nitrogen-doped carbon-coated iron-based metal element-doped Mo2C catalyst for water electrolysis. The electrocatalyst prepared by using the method has excellent water electrolysis performance, low hydrogen evolution overpotential in acidic and alkaline aqueous solutions, and good stability, and can work stably for at least 60 hours. The catalyst can be widely used in the field of electrochemical hydrogen production, and lays a technical foundation for large-scale preparation of hydrogen.

Description

technical field [0001] The invention belongs to the technical field of electrolysis of water, in particular to a high-efficiency hydrogen evolution catalyst and a preparation method thereof. Background technique [0002] In today's energy supply, hydrogen is the most promising clean energy, which has the characteristics of environmental protection, easy storage and high energy density. However, the current method of producing hydrogen from fossil energy used in industrial hydrogen production is usually not in line with the energy development strategy of "green and sustainable development". Although electrocatalytic hydrogen evolution is one of the green and efficient methods for producing hydrogen, there are problems such as expensive catalysts, low catalytic activity and poor stability. Therefore, how to design a hydrogen evolution catalyst with excellent performance and low cost is one of the challenges faced by the current rapid development society. [0003] Molybdenum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224B01J37/02B01J37/03B01J37/08
CPCB01J27/224B01J37/031B01J37/0036B01J37/0215B01J37/082B01J35/33
Inventor 刘长海孙雷陈智栋
Owner CHANGZHOU UNIV
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