Self-assembled hollow tubular tungsten disulfide nano material as well as preparation method and application thereof

A technology of tungsten disulfide and nanomaterials, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of structural damage and collapse, poor cycle stability, low electron mobility, etc., and achieve increased contact area and reaction Effect of temperature control and large specific surface area

Active Publication Date: 2019-12-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although WS 2 It has a large specific surface area, but its electron mobility is low and it can provide a small capacitance
Moreover, the large volume expansion during its charging and discharging process will cause the collapse of the structure, resulting in poor cycle stability.

Method used

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  • Self-assembled hollow tubular tungsten disulfide nano material as well as preparation method and application thereof
  • Self-assembled hollow tubular tungsten disulfide nano material as well as preparation method and application thereof
  • Self-assembled hollow tubular tungsten disulfide nano material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0029] A method for preparing a self-assembled hollow tubular tungsten disulfide electrode material. Include the following steps:

[0030] Step 1: Take 0.2975-2.36g of tungsten hexachloride and 0.567-4.5g of thioacetamide and add it into 30-60mL of ethanol and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 500-800r / min, and the stirring time is 30~120min. Control the molar ratio of tungsten source and sulfur source to be 1:10.

[0031] Step 2, add 0.27~1.08g glucose and 0.054~0.216g PVP to suspension A and stir until completely dissolved to obtain solution B, control the mass ratio of glucose and PVP to 5:1, and the molar ratio of sulfur source to glucose is ( 5~10): (1~3); the stirring speed is 500~800r / min, and the stirring time is 10~30min.

[0032] Step 3, transfer the above solution B to a 100mL polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature is 200-240°C, the reaction time is 4-4...

Embodiment 1

[0036] Step 1: Add 0.2975g tungsten hexachloride and 0.567g thioacetamide into 30mL ethanol solution and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 500r / min and the stirring time is 30min. Control the mol ratio of tungsten hexachloride and thioacetamide to be 1:10;

[0037] Step 2: add 0.27g glucose and 0.054g PVP in suspension A and stir until fully dissolved, the mass ratio of control glucose and PVP is 5:1, and the molar ratio of thioacetamide and glucose is 5:1; Stirring speed is 700r / min, stirring time 10min.

[0038] Step 3: Transfer the above solution to a 100mL polytetrafluoroethylene reactor for homogeneous reaction. The reaction temperature is 200°C and the reaction time is 4h. After the reaction is completed, it is naturally cooled to room temperature.

[0039] Step 4: Open the reaction kettle, take out the product, wash it with absolute ethanol and deionized water in sequence, and centrifuge it. After repe...

Embodiment 2

[0042] Step 1: Add 2.36g of tungsten hexachloride and 4.5g of thioacetamide into 60mL ethanol solution and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 800r / min and the stirring time is 120min. Control the molar ratio of tungsten hexachloride and thioacetamide to be 1:10.

[0043] Step 2: add 3.08g glucose and 0.616g PVP in suspension A and stir until fully dissolved, the mass ratio of controlling glucose and PVP is 5:1, and the molar ratio of thioacetamide and glucose is 7:2; Stirring speed is 800r / min, stirring time 20min.

[0044] Step 3: Transfer the above solution to a 100mL polytetrafluoroethylene reactor for homogeneous reaction. The reaction temperature is 220°C and the reaction time is 48h. After the reaction is completed, it is naturally cooled to room temperature.

[0045] Step 4: Open the reaction kettle, take out the product, wash with absolute ethanol and deionized water in sequence, and centrifuge, repeat...

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Abstract

The invention provides a self-assembled hollow tubular tungsten disulfide nano material as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, adding tungsten hexachloride and thioacetamide into ethanol, and stirring the raw materials until tungsten hexachloride and thioacetamide are completely dissolved to form a suspension A; 2,adding glucose and PVP into the suspension A, and stirring the raw materials until glucose and PVP are completely dissolved to obtain a solution B; 3, carrying out solvothermal reaction on the solution B at the reaction temperature of 200-240 DEG C, and cooling the reaction product after the reaction is finished; step 4, washing and drying a product of the solvothermal reaction to obtain a driedsample; and 5, carrying out annealing treatment on the dried sample at the calcination temperature of 400-600 DEG C to obtain the hollow tubular tungsten disulfide nano material. The hollow tubular tungsten disulfide nano material is prepared by using a one-step solvothermal method, and the volume expansion of the hollow tubular tungsten disulfide nano material in the charging and discharging process can be greatly relieved due to the unique self-assembled hollow tubular structure, so that the structural stability is effectively maintained.

Description

technical field [0001] The present invention relates to WS 2 The preparation of nanomaterials specifically relates to a self-assembled hollow tubular tungsten disulfide nanomaterial and its preparation method and application. Background technique [0002] WS 2 Nanosheets are typical two-dimensional layered transition metal dichalcogenides. The inner layer is a covalent bond (S—W—S) with stronger force, while the interlayer is van der Waals force with weaker force. It is about 0.62nm, which is conducive to the diffusion of smaller metal ions in the matrix. This special structure can promote the further reaction of lithium ions and sodium ions with the matrix material. WS 2 The structure of nanosheets is similar to graphite stacking 2D monolayers through weak van der Waals interactions, and the 2D structure can provide a large surface area and 2D percolation channels to facilitate rapid electron transport within the monolayer, so Na and Li ions can easily from WS 2 Interc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00H01M4/58H01M10/054B82Y30/00
CPCC01G41/00H01M4/5815H01M10/054B82Y30/00C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M2004/027H01M2004/021Y02E60/10
Inventor 黄剑锋罗晓敏曹丽云李嘉胤郭玲王泽坤李东明王蓉
Owner SHAANXI UNIV OF SCI & TECH
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