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

A carbon-based composite material and three-dimensional porous technology, applied in the field of nanomaterials, can solve the problems of inability to obtain a three-dimensional self-supporting structure, high risk factor, cumbersome steps, etc., to improve electrochemical conductivity and catalytic activity, and high-efficiency hydrogen evolution performance , the effect of high specific surface area and roughness

Active Publication Date: 2020-04-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0053] A MoS for electrocatalytic hydrogen evolution 2 A method for preparing a modified three-dimensional porous carbon-based composite material, the specific steps are as follows:

[0054] (1) Add 0.5mmol of ammonium tetrathiomolybdate powder to 60mL of deionized water, and ultrasonically react at room temperature (power 400W, frequency 40kHz) for 2 hours to obtain a uniformly dispersed suspension;

[0055] (2) Cut the carbon fiber felt into a size of 1×1×0.5cm -2 , followed by ethanol and deionized water with 5000rpm rotation number centrifugal washing for 30 minutes, and natural drying, to remove organic impurities therein;

[0056] (3) The obtained carbon fiber mat is subjected to ultraviolet ozone treatment for more than 8 minutes, so that it is completely in a hydrophilic state, so as to ensure that the carbon fiber mat can be fully contacted with the precursor solution;

[0057] Among them, the above-mentioned ultraviolet and ozone treatment conditions are to use an ...

Embodiment 2

[0068] A MoS for electrocatalytic hydrogen evolution 2 A method for preparing a modified three-dimensional porous carbon-based composite material, the specific steps are as follows:

[0069] (1) Add 60 mg of ammonium tetrathiomolybdate powder into 11 mL of N, N-dimethylformamide (DMF) solvent, and obtain a uniformly dispersed suspension through stirring and ultrasonic treatment for 1 hour respectively;

[0070] (2) Configure 6 mL of graphene oxide with a concentration of 3.5 mg / mL, drop it into the above-mentioned ammonium tetrathiomolybdate suspension and stir at room temperature for 1 hour, and ultrasonically (power is 400W, frequency is 40kHz) for 1 hour to obtain mixture;

[0071] (3) Add 10 mmol of urea to the resulting mixed solution, stir for 15 minutes, transfer to the reaction kettle, and keep at 200° C. for 10 hours;

[0072] (4) After the reaction, the resulting black product was soaked in an aqueous solution containing 10-15% alcohol for more than 24 hours, and f...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C25B1/04C25B11/06
CPCB01J27/051B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 曹宁覃一江谷欣秀臧晓蓓李沈婷
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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