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Two-dimensional sheet MoS<2>@ graphene composite nano-material and preparation method thereof

A technology of graphene composite and graphene nanosheets, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of cumbersome preparation process, unsatisfactory performance, single shape, etc. The effect of good repeatability, unique shape and uniform loading

Active Publication Date: 2017-02-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, for graphene-loaded MoS 2 Although some achievements have been made in the research of composite materials, the preparation process is relatively cumbersome, and MoS 2 The shape is relatively simple, and the performance is not satisfactory, and the MoS cannot be fully utilized. 2 Advantages of Composites Combined with Graphene

Method used

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  • Two-dimensional sheet MoS&lt;2&gt;@ graphene composite nano-material and preparation method thereof
  • Two-dimensional sheet MoS&lt;2&gt;@ graphene composite nano-material and preparation method thereof
  • Two-dimensional sheet MoS&lt;2&gt;@ graphene composite nano-material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Weigh 30 mg of dried reduced graphene oxide, dissolve it in 40 ml of deionized water, and ultrasonicate for 2 hours to make it evenly dispersed;

[0023] b. Weigh 344mg of polyethyleneimine, dissolve it in 20ml of deionized water, stir for 2h to make it evenly dispersed; mix the above solutions, stir for 1h to make it evenly mixed;

[0024] c. Add 0.3g of sodium molybdate to the above mixed solution and continue to stir for 1h; then add 0.4g of thiourea and stir for 1h;

[0025] d. Pour the reacted mixed solution into a polytetrafluoroethylene-lined autoclave and react at 200°C for 24 hours;

[0026] e. After the reaction is completed, the product is centrifuged and washed repeatedly with deionized water and ethanol, dried at 60°C and calcined at 600°C for 2 hours in a nitrogen atmosphere to obtain the two-dimensional sheet-like MoS prepared by the present invention 2 @graphene nanomaterials.

[0027] The prepared samples were characterized for their physical prope...

Embodiment 2

[0029] The preparation process and steps of this embodiment are basically the same as in Example 1, except that the d step:

[0030] Add 0.1g of sodium molybdate to the above solution, and continue to stir for 1h; then add 0.4g of thiourea, and stir for 1h;

[0031] The obtained results are similar to the results of Example 1, all of which are flaky MoS 2 loaded on graphene, but loaded MoS 2 The flakes are sparse and their appearance has changed.

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Abstract

The invention relates to a two-dimensional sheet MoS<2>@ graphene composite nano-material and a preparation method thereof. Pyrolysis reduced graphene oxide, polymine, sodium molybdate and thiourea are used as raw materials; water is used as a solvent; and thus, by means of a simple hydrothermal synthesis method, the sheet MoS<2>@ graphene composite nano-material having uniform morphologies and structures can be prepared under the auxiliary action of polymine. An electron microscope result shows that an ultra-thin MoS<2> nano-sheet is loaded on high-quality graphene vertically and uniformly and the dispersity is good. An XRD spectrogram shows that: compared with an unheated precursor, the crystallinity of a roasted MoS<2> material is obviously increased; and the roasted MoS<2> material belongs to a typical 2H-MoS<2> crystalline phase of a hexagonal crystal system. According to the two-dimensional sheet MoS<2>@ graphene composite nano-material and the preparation method thereof disclosed by the invention, a synthesis process is simple and controllable; the morphology homogeneous degree and the load rate of the material are high; the repeatability is good; and thus, the two-dimensional sheet MoS<2>@ graphene composite nano-material and the preparation method thereof disclosed by the invention have a certain application prospect in new energy fields, such as lithium ion batteries.

Description

technical field [0001] The invention relates to a two-dimensional flake MoS 2 @Graphene nanocomposite materials and their preparation methods belong to the field of new energy materials. Background technique [0002] Since the 21st century, environmental pollution and energy shortages have become increasingly serious. Therefore, there is an urgent need to develop and utilize various new energy technologies. Lithium-ion batteries have become one of the high-energy batteries that can best meet the sustainable development requirements of the future society due to their advantages such as high specific capacity, good safety, small self-discharge, stable performance, and no environmental pollution. The negative electrode material is one of the key materials that affect the performance of lithium-ion batteries. How to improve the energy density of battery anode materials and obtain materials with advantages such as high reversible capacity, good cycle performance, stable struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583B82Y30/00H01M10/0525
CPCB82Y30/00H01M4/362H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 张海娇夏赛赛
Owner SHANGHAI UNIV
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