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Tungsten disulfide/graphene oxide composite material and preparation method and application thereof

A technology of tungsten disulfide and composite materials, which is applied in the field of material science, can solve the problems that the performance of electrode materials cannot be greatly improved, and the advantages of specific surface area are lost, so as to improve electrochemical performance, increase dispersion and specific surface area, Avoid the effect of reunion

Active Publication Date: 2018-08-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The atomic layers that have been peeled off in this step tend to reunite together again, losing the advantage of its specific surface area, so that the performance of the prepared electrode material cannot be greatly improved

Method used

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  • Tungsten disulfide/graphene oxide composite material and preparation method and application thereof
  • Tungsten disulfide/graphene oxide composite material and preparation method and application thereof
  • Tungsten disulfide/graphene oxide composite material and preparation method and application thereof

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preparation example Construction

[0039] In some embodiments, the preparation method comprises:

[0040] Mix tungsten disulfide and sodium nitrate evenly, continue to stir under ice bath conditions, and slowly add concentrated sulfuric acid, continue to stir for more than 20 minutes, then slowly add potassium permanganate, and continue to stir for more than 15 minutes to form the first reaction mixture;

[0041] Continue stirring the first reaction mixture at room temperature for more than 12 hours, then slowly add deionized water dropwise, continue stirring for more than 30 minutes, then slowly add hydrogen peroxide, and continue stirring for more than 2 hours to form a second reaction mixture;

[0042] Separating and obtaining a uniform dispersion of tungsten disulfide nanosheets from the second reaction mixture;

[0043] Mix the homogeneous dispersion of tungsten disulfide nanosheets with the homogeneous dispersion of graphene oxide prepared by Hummer's method, and ultrasonicate for more than 2 hours to obt...

Embodiment 1

[0061] Embodiment 1: This embodiment provides a tungsten disulfide / graphene oxide composite material, wherein tungsten disulfide nanosheets are interspersed between atomic layers of graphene oxide.

[0062] The preparation method of this tungsten disulfide / graphene oxide composite material comprises:

[0063] 1. Preparation of tungsten disulfide nanosheets

[0064] (1) Mix 1.5g of tungsten disulfide and 0.17g of sodium nitrate powder evenly, keep stirring in an ice bath, and slowly add 11.5mL of concentrated sulfuric acid into the mixture of tungsten disulfide and sodium nitrate;

[0065] (2) Maintain the ice bath and stirring conditions described in step (1), after 20 minutes, slowly add 1.5g potassium permanganate, and continue to stir for 15min;

[0066] (3) Remove the ice bath, continue stirring at room temperature (about 25°C) for 12 hours, slowly add 50 mL of deionized water (about 60°C), and continue stirring for 30 minutes, then slowly add 1.6 mL of 30% hydrogen perox...

Embodiment 2

[0074] Embodiment 2: This embodiment provides a tungsten disulfide / graphene oxide composite material, wherein tungsten disulfide nanosheets are interspersed between graphene atomic layers.

[0075] The preparation method of this tungsten disulfide / graphene oxide composite material comprises:

[0076] Step (1) to step (4): exactly the same as step (1) to step (4) in Example 1 to obtain a tungsten disulfide / graphene oxide composite material;

[0077] Step (5): Add ammonia water dropwise to the dispersion of the aforementioned tungsten disulfide / graphene oxide composite material and keep stirring to increase the pH value from 7 to 10, and then continue to sonicate for about 2 hours.

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Abstract

The invention discloses a tungsten disulfide / graphene oxide composite material, which comprises a tungsten disulfide nanosheet and graphene oxide, wherein the tungsten disulfide nanosheet is intercalated between laminations of the graphene oxide. Preferably, the tungsten disulfide nanosheet and the graphene oxide are mutually intercalated and composited. The invention further discloses a method for preparing the tungsten disulfide / graphene oxide composite material and an application of the tungsten disulfide / graphene oxide composite material, such as the application in the preparation of an electrode material and a supercapacitor. The two two-dimensional material layers such as the tungsten disulfide and graphene oxide are enabled to be mutually intercalated by using different van der Waals' force therebetween, thereby reducing the respective clustering effect, thus being capable of increasing the dispersity, and enabling the tungsten disulfide / graphene oxide composite material to be an excellent material for preparing devices such as a supercapacitor and a battery and especially an electrode of such devices.

Description

technical field [0001] The invention specifically relates to a tungsten disulfide / graphene oxide composite material, the invention and application of its preparation method, and belongs to the field of material science. Background technique [0002] Both graphene and tungsten disulfide are two-dimensional materials with a honeycomb six-membered ring structure, and the interlayers are bonded by Van der Waals force. In the natural state, both of them tend to agglomerate in layers to form thicker sheets. shaped crystals. Graphene (r-GO) oxidized by the Hummer's method is stretched by various functional groups between the layers, so that the thicker flakes are exfoliated into thinner single-layer / few-layer graphene oxide, and a larger specific surface area is obtained. , which can be applied to the electrode material of supercapacitors. [0003] However, before making electrode materials, graphene oxide needs to undergo a reduction step to remove interlayer functional groups. ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/36H01G11/30H01G11/24
Inventor 王元斐秦禄昌田天陈友虎李云朋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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