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Preparation method of tungsten disulfide nanosheet for electrocatalytic hydrogen evolution

A technology of tungsten disulfide and electrocatalysis, applied in chemical instruments and methods, electrodes, inorganic chemistry, etc., to achieve the effect of simple method, uniform distribution and low cost

Inactive Publication Date: 2019-12-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The common preparation methods of tungsten disulfide include mechanical and liquid stripping methods, hydrothermal method and chemical vapor deposition (CVD), etc. Among them, the hydrothermal method and chemical vapor deposition method are simple to operate, the size and thickness of the prepared material are controllable, and the cost is cheap , suitable for large-scale preparation, but large-sized, uniform and controllable WS 2 Preparation is still a great challenge

Method used

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  • Preparation method of tungsten disulfide nanosheet for electrocatalytic hydrogen evolution
  • Preparation method of tungsten disulfide nanosheet for electrocatalytic hydrogen evolution
  • Preparation method of tungsten disulfide nanosheet for electrocatalytic hydrogen evolution

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Dissolve 2g of sodium tungstate and 25g of hydrochloric acid in 250ml of deionized water, and stir for 30 minutes to obtain a uniform solution. 20 ml of the above-prepared solution was taken into a stainless steel autoclave (50 mL), and then 1 g of ammonium sulfate was added to the solution. A piece of carbon cloth (2 cm × 2 cm) was ultrasonically cleaned with acetone, deionized water, and ethanol in sequence, put into an autoclave and sealed, and kept at 180 °C for 16 h. After cooling the autoclave to room temperature, the carbon cloth was removed and rinsed several times with deionized water, and dried at 60 °C in ambient air. Finally, tungsten trioxide / carbon cloth (WO 3 / CC) were calcined at 450° C. for 1 hour in air.

[0023] Under the protection of argon atmosphere, tungsten trioxide was calcined in the high temperature zone of the dual temperature zone tube furnace, and the temperature was raised to 600°C at a rate of 20°C / min. At the same time, 1g of sulfur p...

Embodiment 2

[0025] Considering that the amount of tungsten trioxide prepared in one experiment in the above example is too small, the preparation of tungsten trioxide can be realized by increasing the amount of precursor. Dissolve 6g of sodium tungstate and 25g of hydrochloric acid in 250ml of deionized water, and stir for 30 minutes to obtain a uniform solution. 20 ml of the above-prepared solution was taken into a stainless steel autoclave (50 mL), and then 1.5 g of ammonium sulfate was added to the solution. A piece of carbon cloth (2 cm × 2 cm) was ultrasonically cleaned with acetone, deionized water, and ethanol in sequence, put into an autoclave and sealed, and kept at 180 °C for 16 h. After cooling the autoclave to room temperature, the carbon cloth was removed and rinsed several times with deionized water, and dried at 60 °C in ambient air. Finally the obtained sample was calcined at 450° C. for 1 hour in air. Other experimental steps are the same.

Embodiment 3

[0027] By controlling the holding time of the tube furnace, the size and thickness of the tungsten disulfide nanosheets can be controlled, and other experimental conditions remain unchanged. The holding time of the tube furnace was halved to 1 hour to obtain thinner and smaller tungsten disulfide nanosheets.

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Abstract

The invention relates to a preparation method of a tungsten disulfide nanosheet for electrocatalytic hydrogen evolution. The preparation method comprises the following steps: preparation of tungsten trioxide / carbon cloth (WO3 / CC); and preparation of tungsten disulfide / carbon cloth (WS2 / CC): under the protection of an argon atmosphere, calcining the tungsten trioxide / carbon cloth in a high-temperature area of a double-temperature-area tubular furnace, carrying out heating to 600 DEG C at a speed of 20 DEG C / min, putting 1 g of sulfur powder into a low-temperature area of the double-temperature-area tubular furnace, carrying out heating to 200 DEG C at a speed of 7 DEG C / min, preserving heat for 1 to 3 h, naturally cooling the tubular furnace to room temperature, and then taking out the tungsten disulfide / carbon cloth (WS2 / CC).

Description

technical field [0001] The invention belongs to the technical field of preparation of transition metal dichalcogenides (TMDs), in particular to a method for growing WS on carbon cloth 2 Preparation method of nanosheets and its application in catalysis of electrochemical hydrogen evolution reaction. Background technique [0002] In recent years, due to environmental pollution and the crisis of fossil energy, it is urgent to find clean, renewable and inexpensive materials. As an environmentally friendly fuel, hydrogen is clean and renewable, has high energy density and abundant resources, and is considered to be an ideal substitute for traditional fossil fuels. Among them, hydrogen production by electrolysis of water has attracted much attention because of its high efficiency and storability. So far, the electrocatalysts with the most effective catalytic hydrogen evolution and the best catalytic cycle performance are still precious metal catalysts such as Pt, but due to the ...

Claims

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Application Information

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IPC IPC(8): C01G41/00C25B1/04C25B11/04
CPCC01G41/00C01P2002/72C01P2004/03C01P2004/20C25B1/04C25B11/051C25B11/057C25B11/075Y02E60/36
Inventor 马丽颖陈娇赵乃勤师春生何春年何芳刘恩佐沙军威
Owner TIANJIN UNIV
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