Preparation method of MoS2-modified three-dimensional porous carbon-based composite material for electro-catalytic hydrogen evolution

Abstract

The invention relates to the field of nanometer materials, and provides a preparation method of a MoS2-modified three-dimensional porous carbon-based composite material for electro-catalytic hydrogenevolution. The method specifically comprises the following steps: using a three-dimensional porous carbon-based material as a carrier, using ammonium tetrathiomolybdate as a sulfur source and a molybdenum source, transferring into a reaction kettle, and preparing the MoS2-modified three-dimensional porous carbon-based composite material by using a one-step solvothermal method. According to the invention, the method is simple and convenient to operate and low in cost; the synthesized composite material has an open three-dimensional porous structure, and easily achieves the migration of electrolyte and the release of hydrogen; and ultrathin MoS2 nano-sheets are uniformly and vertically arranged on a framework, so that the material shows excellent hydrogen evolution catalytic activity and excellent conductivity in an acidic electrolytic solution, still keeps efficient hydrogen evolution performance after cyclic polarization 2000 times, is good in stability and high in reusability, can beused for large-scale production, is expected to replace precious metals such as platinum and the like, and is widely applied to electrocatalytic hydrogen production.

Description

technical field [0001] The invention relates to the field of nanomaterials and provides a MoS for electrocatalytic hydrogen evolution 2 Preparation method of modified three-dimensional porous carbon matrix composites. Background technique [0002] The development of human society and the advancement of science and technology are inseparable from the use of energy. Since the beginning of the 21st century, the excessive consumption of traditional fossil fuels has caused a crisis in the abundant reserves of coal, oil, and natural gas, and the consumption of fossil fuels has exacerbated global warming crisis. Therefore, the development and utilization of clean and renewable energy has become an urgent problem to be solved. As a clean chemical fuel with high gravimetric energy density, hydrogen energy is considered as one of the most promising alternative energy sources that may replace carbon-based fossil fuels in the future. As an environmentally friendly hydrogen generation...

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Problems solved by technology

Therefore, there have been many improved MoS 2 Catalytic performance methods, such as Sun et al. (Tao S, Jun W, Xiao C, et al. Engineering the Electronic Structure of MoS2 Nanorods by N and Mn Dopants for Ultra-Efficient Hydrogen Production[J].ACS Catalysis,2018:acscatal.8b00783 .) Modification of MoS by co-doping of manganese and nitrogen 2 Electrocatalytic electron configuration to further improve hydrogen evolution performance, but this method is cumbersome and has high risk factors; Xie et al. (Xie J, Zhang H, Li S, et al. Defect-RichMoS2 Ultrathin Nanosheets with Additional Active Edge Sites for Enhanced Electrocatalytic Hydrogen Evolution[ J].Advanced Materials,2013,25(40):5807-5813.) Increased MoS by designing high-concentration precursors and different amounts of sulfur sources 2 Defects in ultrathin nanosheets favor hydrogen evolution reaction

However, this method cannot obtain three-dimensional self-supporting structures

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