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A kind of preparation method of high catalytic activity electrocatalyst 1t' phase tungsten sulfide

A high catalytic activity, electrocatalyst technology, applied in the field of material chemistry, can solve the problems of limited later application, and achieve the effect of uniform size, small Tafel slope, and multiple catalytic active sites

Active Publication Date: 2020-05-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of nanomaterials synthesized by colloid method is covered with a layer of hydrophobic organic ligands / surfactants, which greatly limits the later application.

Method used

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  • A kind of preparation method of high catalytic activity electrocatalyst 1t' phase tungsten sulfide
  • A kind of preparation method of high catalytic activity electrocatalyst 1t' phase tungsten sulfide
  • A kind of preparation method of high catalytic activity electrocatalyst 1t' phase tungsten sulfide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 0.2mmol of ammonium tungstate and 0.6mmol of thiourea in 20mmol of high boiling point solvent octadecylamine, heat to 100°C under the protection of nitrogen until the solution turns light yellow, and then react at 280°C for 60 Minutes, after natural cooling to room temperature, add 50mL of ethanol, filter to obtain a filter cake, wash and dry the filter cake to obtain a black powder with a size of 160nm, which is the high catalytic activity electrocatalyst 1T'phase tungsten sulfide.

[0019] see figure 1 , the prepared product was identified as metallic 1T' phase WS by powder X-ray diffraction 2 .

[0020] see figure 2 , the product was observed by transmission electron microscopy as spherical nanoparticles with a size of 160nm.

Embodiment 2

[0022] Dissolve 0.2mmol of ammonium tungstate and 0.6mmol of thiourea in 10mmol of high boiling point solvent hexadecylamine, heat to 120°C under the protection of nitrogen until the solution turns light yellow, and then react at 300°C for 90 Minutes, after natural cooling to room temperature, add 50mL of ethanol, filter to obtain a filter cake, wash and dry the filter cake to obtain high catalytic activity electrocatalyst 1T'phase tungsten sulfide.

Embodiment 3

[0024] Dissolve 0.2mmol of ammonium tungstate and 0.6mmol of thiourea in 20mmol of a mixed solvent of high boiling point solvent dodecane and oleylamine, heat to 120°C under the protection of nitrogen until the solution turns light yellow, and then at 300 React at ℃ for 60 minutes, cool to room temperature naturally, add 50mL of ethanol, filter to obtain a filter cake, wash and dry the filter cake to obtain high catalytic activity electrocatalyst 1T'phase tungsten sulfide.

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Abstract

A preparation method for high catalytic activity electrocatalyst 1T' phase tungsten sulfide. Ammonium tungstate and thiourea are dissolved in a high boiling point solvent, heated to 100-120°C under the protection of inert gas, and then heated at 280-320°C. After the reaction, naturally cool to room temperature, add ethanol, filter to obtain a filter cake, wash and dry the filter cake to obtain a high catalytic activity electrocatalyst 1T' phase tungsten sulfide. In the present invention, ammonium tungstate and thiourea are dissolved in a high-boiling solvent and subjected to heat treatment to obtain metal 1T' phase WS with uniform size distribution. 2 Nanoparticle self-assembly. 1T’ phase WS prepared by the present invention 2 The products all have the advantages of high crystallinity, uniform morphology and size, no agglomeration, and good dispersion in non-polar solvents. Since 1T’ phase WS 2 It has higher conductivity and more catalytically active sites, allowing it to exhibit excellent hydrogen evolution reaction activity as an electrocatalyst.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a method for preparing a high catalytic activity electrocatalyst 1T' phase tungsten sulfide. Background technique [0002] Electrocatalytic hydrogen evolution reaction is an important means in the field of clean energy conversion. Platinum / carbon catalysts are currently the standard catalysts, but their scarcity and high cost limit their large-scale applications. Therefore, people continue to work hard to find new non-platinum catalysts, but they are still in an immature stage of development. Among them, the biggest obstacle is the stability of the catalyst. Compared with conventional platinum-based catalysts, non-platinum-based catalysts can still show good catalytic performance in the initial stage and have the advantage of low cost, but their catalytic activity decreases rapidly over time, resulting in a lower cost performance. In addition to noble me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/047B01J35/00C25B11/06C25B1/02
CPCC25B1/02C25B11/04B01J27/047B01J35/33
Inventor 杜亚平刘正清
Owner XI AN JIAOTONG UNIV
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