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Preparation method for tungsten disulfide/MXene composite material

A composite material, tungsten disulfide technology, applied in chemical instruments and methods, tungsten compounds, carbides, etc., can solve the problems of low electrical conductivity and limited rate performance, and achieve good dispersion, uniform morphology and product output. high rate effect

Active Publication Date: 2019-12-10
JIANGSU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Tungsten disulfide (WS 2 ) is also a two-dimensional crystal material with a layered structure similar to graphite. Tungsten disulfide is often used as a negative electrode material for lithium-ion batteries due to its layered structure. When it is used as an energy storage material, although the specific capacity is relatively high, but Due to its lower conductivity than MXene, its rate performance is limited

Method used

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  • Preparation method for tungsten disulfide/MXene composite material
  • Preparation method for tungsten disulfide/MXene composite material
  • Preparation method for tungsten disulfide/MXene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 10mL of concentrated hydrochloric acid to 14mL of deionized water to make a 5mol / L hydrochloric acid solution, slowly pour 1.5g of lithium fluoride into the prepared hydrochloric acid solution, stir and react for 5min, then slowly add 0.96g of Ti 3 AlC 2 powder, stirred at 40°C for 24h with a magnetic stirrer, washed with water, centrifuged, and dried at 60°C for 12h to obtain the MXene material Ti 3 C 2 powder, the resulting MXene material Ti 3 C 2 The SEM photograph of the powder is as figure 1 As shown, it can be seen that the MXene material Ti after etching 3 C 2 It shows an obvious organ-like multi-layer structure.

[0029] Weigh the prepared MXene material Ti 3 C 2 Pour 90 mg of the powder into 30 mL of deionized water, ultrasonically disperse for 30 min, then add 0.66 g of sodium tungstate dihydrate, 0.78 g of thiourea, and 0.5 g of oxalic acid to the MXene solution, and stir for 20 min to obtain a precursor solution. Transfer to a hydrothermal react...

Embodiment 2

[0033] Add 10mL of concentrated hydrochloric acid to 20mL of deionized water to make a 4mol / L hydrochloric acid solution, slowly pour 1.4g of lithium fluoride into the prepared hydrochloric acid solution, stir for 8min, then slowly add 1.05g of Ti 3 AlC 2 powder, stirred at 40°C for 36h with a magnetic stirrer, washed with water, centrifuged, and vacuum-dried at 60°C for 12h to obtain the MXene material Ti 3 C 2 powder.

[0034] Weigh the prepared MXene material Ti 3 C 2 Pour 150mg of powder into 30mL of deionized water, ultrasonically disperse for 30min, then add 0.99g of sodium tungstate dihydrate, 1.14g of thiourea, and 0.6g of oxalic acid to the MXene solution, and stir for 20min to obtain a precursor solution. Transfer to a hydrothermal reaction kettle with a volume of 50mL; carry out hydrothermal reaction at 260°C for 20h, then cool naturally, after centrifugation, wash with deionized water and ethanol three times, and finally put the centrifuged black sample into V...

Embodiment 3

[0037] Add 10mL of concentrated hydrochloric acid to 30mL of deionized water to make a 3mol / L hydrochloric acid solution, slowly pour 1.5g of lithium fluoride into the prepared hydrochloric acid solution, stir for 8min, then slowly add 1.4g of Ti 3 AlC 2powder, stirred at 40°C for 24 hours with a magnetic stirrer, washed with water, centrifuged, and vacuum-dried at 60°C for 12 hours to obtain the MXene material Ti 3 C 2 powder.

[0038] Weigh the prepared MXene material Ti 3 C 2 Pour 120mg of powder into 30mL of deionized water, ultrasonically disperse for 30min, then add 0.5g of sodium tungstate dihydrate, 0.58g of thiourea, and 0.45g of oxalic acid into the solution, stir for 20min to obtain a precursor solution, and finally transfer the precursor solution to Put it into a hydrothermal reaction kettle with a volume of 50mL; conduct a hydrothermal reaction at 250°C for 26 hours, then cool naturally, after centrifugation, wash with deionized water and ethanol three times e...

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Abstract

The invention belongs to the technical field of inorganic materials, and specifically relates to a preparation method for a tungsten disulfide / MXene composite material. The preparation method comprises the following steps: (1) adding lithium fluoride into a hydrochloric acid solution so as to obtain an etching solution; (2) adding Ti3AlC2 into the etching solution, carrying out an etching reaction, and carrying out washing, centrifuging and vacuum drying so as to obtain a two-dimensional layered MXene material Ti3C2; and (3) dispersing the MXene material Ti3C2 into deionized water, then addingsodium tungstate dihydrate, thiourea and oxalic acid, carrying out uniform mixing under stirring, carrying out a hydrothermal reaction, and carrying out centrifuging, washing and drying so as to obtain the tungsten disulfide / MXene composite material. The tungsten disulfide / MXene composite material prepared by using the method provided by the invention has uniform morphology and good dispersity; meanwhile, the preparation method is simple and easily-controllable, has low cost, and is applicable to large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a preparation method of a tungsten disulfide / MXene composite material. Background technique [0002] As a typical two-dimensional crystal, graphene has caused a research and development boom in academia and industry, and has been widely used in composite material reinforcements, electrochemical energy storage, high-efficiency radiators, touch screens, etc. Similar to the graphene structure, MXene materials are a class of two-dimensional transition metal carbide or nitride crystals with a thickness of only one or a few atoms. MXene also exhibits high metallic conductivity, excellent mechanical stability, electronic and magnetic properties. [0003] Tungsten disulfide (WS 2 ) is also a two-dimensional crystal material with a layered structure similar to graphite. Tungsten disulfide is often used as a negative electrode material for lithium-ion batteries du...

Claims

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Application Information

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IPC IPC(8): C01G41/00C01B32/921
CPCC01G41/00C01P2002/72C01P2002/80C01P2004/03C01B32/921
Inventor 张向华叶霞徐鸿翔刘涛
Owner JIANGSU UNIVERSITY OF TECHNOLOGY
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