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Preparation method of WSe2 (tungsten diselenide) thin film material and application in photocatalytic reduction of CO2 (carbon dioxide)

A tungsten diselenide, photocatalytic technology, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of large particle size, no photocatalytic activity, and high calcination temperature, and achieve high recycling rate, good photoelectric performance, The effect of high material purity

Active Publication Date: 2018-02-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel preparation method of tungsten diselenide film material and its application in photocatalytic reduction of CO 2 It solves the problems of high calcination temperature, high energy consumption, too large particle size of the prepared sample and no photocatalytic activity in the traditional preparation method.

Method used

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  • Preparation method of WSe2 (tungsten diselenide) thin film material and application in photocatalytic reduction of CO2 (carbon dioxide)
  • Preparation method of WSe2 (tungsten diselenide) thin film material and application in photocatalytic reduction of CO2 (carbon dioxide)
  • Preparation method of WSe2 (tungsten diselenide) thin film material and application in photocatalytic reduction of CO2 (carbon dioxide)

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Dissolve 1.0 g of polyvinylpyrrolidone and 1.0 g of citric acid in 20 mL of deionized water, weigh 1 g of selenium powder, add to the above solution, mix well, and dry in an oven at 60 °C for later use. will be 10 cm 2 The metal tungsten sheet was washed with 30 mL of acetone, absolute ethanol, and deionized water respectively, and then drained. Then soak in 100mL, 0.5 mol / L dilute hydrochloric acid solution for 30min, rinse with deionized water, dry and set aside. The prepared selenium powder is placed on the air inlet side, the treated metal tungsten sheet is placed on the gas outlet side, and both are placed in the constant temperature zone of the tube furnace. Before the reaction, high-purity nitrogen gas was introduced in advance to remove the air. Then start heating to raise the temperature, and at the same time switch the gas into hydrogen / nitrogen mixed gas, wherein the hydrogen content is 20% (V / V). After reaching 600 °C, it was kept for 8 h, and finally co...

Embodiment 2

[0028]Dissolve 0.1 g of polyvinylpyrrolidone and 1.0 g of citric acid in 10 mL of deionized water, weigh 1 g of selenium powder, add to the above solution, mix well, and dry in an oven at 60 °C for later use. Wash the metal tungsten sheet with 30 mL of acetone, absolute ethanol, and deionized water respectively, and drain. Then soak in 100mL, 0.5 mol / L dilute hydrochloric acid solution for 30 minutes, rinse with deionized water, dry and set aside. The prepared selenium powder is placed on the air inlet side, the treated metal tungsten sheet is placed on the gas outlet side, and both are placed in the constant temperature zone of the tube furnace. Before the reaction, high-purity argon was passed through to remove the air. Then start to heat up the temperature, and at the same time switch the gas into hydrogen / argon gas mixture, wherein the hydrogen content is 0.5% (V / V). After reaching 900 °C, it was kept for 2 h, and finally cooled naturally. After the temperature of the t...

Embodiment 3

[0030] Dissolve 1.0 g of polyvinylpyrrolidone and 0.1 g of citric acid in 10 mL of deionized water, weigh 1 g of selenium powder, add to the above solution, mix well, and dry in an oven at 60 °C for later use. Wash the metal tungsten sheet with 30 mL of acetone, absolute ethanol, and deionized water respectively, and drain. Then soak in 100mL, 0.5 mol / L dilute hydrochloric acid solution for 30 minutes, rinse with deionized water, dry and set aside. The prepared selenium powder is placed on the air inlet side, the treated metal tungsten sheet is placed on the gas outlet side, and both are placed in the constant temperature zone of the tube furnace. Before the reaction, high-purity nitrogen gas was introduced in advance to remove the air. Then start heating to raise the temperature, and at the same time switch the feeding gas to hydrogen / nitrogen mixed gas, wherein the hydrogen content is 0.5% (V / V). After reaching 900 °C, it was kept for 2 h, and finally cooled naturally. Af...

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Abstract

The invention discloses a novel preparation method of a WSe2 (tungsten diselenide) nanowire thin film material and application in photocatalytic reduction of CO2 (carbon dioxide), and belongs to the technical field of preparation of materials and high-value utilization of CO2. The WSe2 nanowire thin film material is prepared by the following steps of using tungsten sheets and selenium powder as precursors; properly treating the precursors; then using a tubular furnace as a reactor, and calcining in the filled hydrogen gas / inert gas mixed gas, so as to obtain the WSe2 nanowire thin film material. The obtained sample has an excellent property in photocatalytic reduction of CO2. The prepared WSe2 nanowire thin film material has the advantages that the thickness is controllable, the surface isflat and smooth, the specific surface area of the catalyst material is large and the like; meanwhile, in the whole process, the cost is low, the efficiency is high, the green and environment-friendlyeffects are realized, the stability of the catalyst is high, the actual production requirement is met, and the larger application potential is realized.

Description

technical field [0001] The invention belongs to the technical field of material preparation and high-value utilization of carbon dioxide, and specifically relates to a novel preparation method of a tungsten diselenide nanowire film material and photocatalytic reduction of CO 2 application. Background technique [0002] Tungsten diselenide (WSe 2 ), as the main transition metal selenide, is a kind of engineering material and functional material with many special properties. The main structure of tungsten diselenide is composed of upper and lower layers of selenium atoms connected to the middle layer of tungsten atoms. Neighboring two WSes 2 The interlayer force is weak van der Waals force. WS 2 The material has a high light absorption capacity, and the light energy absorbed by it can be efficiently converted into electrical energy. At the same time, WSe 2 The decomposition temperature reaches 850°C; it is resistant to acids, alkalis and other media, and has good stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 梁诗景甘甜祝淑颖
Owner FUZHOU UNIV
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