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Preparation method of carbon-coated tungsten sulfide hollow nanosphere with shell layer with sandwich structure

A hollow nano-sandwich technology, applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology, etc., can solve the problems of poor conductivity of semiconductors, and achieve the effects of excellent performance, large output, simple process and environmental protection

Inactive Publication Date: 2018-01-19
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since tungsten disulfide has a multilayer stacked structure, the intercalation of lithium ions will cause changes in volume or structure, and tungsten disulfide is a semiconductor with poor conductivity.

Method used

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  • Preparation method of carbon-coated tungsten sulfide hollow nanosphere with shell layer with sandwich structure
  • Preparation method of carbon-coated tungsten sulfide hollow nanosphere with shell layer with sandwich structure
  • Preparation method of carbon-coated tungsten sulfide hollow nanosphere with shell layer with sandwich structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of hollow mesoporous carbon nanospheres:

[0031] Add 25 mL of absolute ethanol, 5 mL of deionized water, and 0.5 mL of ammonia water into a beaker and perform magnetic stirring. At the same time, add 0.5 mL of ethyl orthosilicate to the above mixture, stir the mixture for a period of time, and weigh 0.1 g of resorcinol and 0.1 g of formaldehyde were sequentially added to the above mixed solution, and the reaction was performed with magnetic stirring for 12 h. After the reaction was completed, it was centrifuged and washed to obtain a solid phase and then dried. The dried product was calcined at 500 °C for 24 h at a heating rate of 1 °C / min under the protection of argon. Then the product calcined at high temperature was etched with 2 M sodium hydroxide solution for 12 h in a water bath at 50 °C. Finally, the etched product is centrifuged and washed, and the obtained solid phase is dried to obtain hollow mesoporous carbon nanospheres.

[0032] The hollow...

Embodiment 2

[0036] 1. Preparation of hollow mesoporous carbon nanospheres:

[0037] Add 50 mL of absolute ethanol, 15 mL of deionized water, and 3 mL of ammonia water into a beaker and perform magnetic stirring. At the same time, add 0.7 mL of ethyl orthosilicate to the above mixture, stir the mixture for a period of time, and weigh 0.1 g of resorcinol and 0.5 g of formaldehyde were added to the above mixed solution in sequence, and the reaction was carried out by magnetic stirring for 12 h. After the reaction was completed, it was centrifuged and washed to obtain a solid phase and then dried. The dried product was calcined at 700 °C for 5 h at a heating rate of 2 °C / min under the protection of argon. Then the product calcined at high temperature was etched with 1.5 M sodium hydroxide solution for 20 h in a water bath at 60 °C. Finally, the etched product is centrifuged and washed, and the obtained solid phase is dried to obtain hollow mesoporous carbon nanospheres.

[0038] Hollow mesopo...

Embodiment 3

[0042] 1. Preparation of hollow mesoporous carbon nanospheres:

[0043] Add 160 mL of absolute ethanol, 40 mL of deionized water, and 8 mL of ammonia water into a beaker and perform magnetic stirring. At the same time, add 0.8 mL of ethyl orthosilicate to the above mixture, stir the mixture for a period of time, and weigh 0.1 g of resorcinol and 0.6 g of formaldehyde were successively added to the above mixed solution, and the reaction was performed with magnetic stirring for 24 hours. After the reaction was completed, it was centrifuged and washed to obtain a solid phase and then dried. The dried product was calcined at 800 °C for 2 h at a heating rate of 5 °C / min under the protection of argon. Then the product calcined at high temperature was etched with 2 M sodium hydroxide solution for 12 hours under the condition of 90° C. water bath. Finally, the etched product is centrifuged and washed, and the obtained solid phase is dried to obtain hollow mesoporous carbon nanosphere...

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Abstract

The invention relates to a preparation method of a carbon-coated tungsten sulfide hollow nanosphere with a shell layer with a sandwich structure, and belongs to the technical field of production of anano material. The preparation method comprises the steps of: mixing alcohol, deionized water, ammonium hydroxide, ethyl orthosilicate, resorcinol and formaldehyde to perform a reaction, obtaining a solid phase to dry, and after calcining in argon, etching by aqueous solution of sodium hydroxide to obtain a hollow mesoporous carbon nanosphere; and after dissolving tungsten chloride and thiourea solid in the deionized water, adding the hollow mesoporous carbon nanosphere, after carrying out ultrasonic dispersion, performing a hydrothermal reaction, and after obtaining a solid phase to dry, calcining in the argon so as to obtain the carbon-coated tungsten sulfide hollow nanosphere of which the shell layer has the sandwich structure. The preparation method disclosed by the invention has the characteristics of cheap process raw material, simple and environmental-friendly process, high yield and excellent performance; the prepared carbon-coated tungsten sulfide hollow nanosphere of which the shell layer has the sandwich structure can be applied as a lithium ion battery electrode material, a photocatalysis material or an electro-catalysis material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial production, in particular to a carbon-coated tungsten sulfide (WS) shell with a sandwich structure. 2 @C) Preparation method of hollow nanospheres. Background technique [0002] Since the discovery of graphene, other graphene-like structures have been studied, especially layered transition metal sulfides (MoS 2 , W 2 ). Due to its electrochemical conversion and ion conductivity, it is an important lithium storage compound. Among transition metal sulfides, layered tungsten disulfide (WS 2 ) is a layered semiconductor material with a unique sandwich-type layered structure (S-W-S). The covalent atoms between the layers are combined by weak van der Waals forces, and the gaps between the atomic layers can allow foreign reactants to perform intercalation reactions. and has better than MoS 2 The ionic conductivity, WS 2 (433mA h g -1 ) The theoretical capacity of the negative electrode of lit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00B01J27/047B01J37/03B01J37/08B01J37/10B01J35/10
CPCY02E60/10
Inventor 陈铭张秀娥曹圣平姜晖赵荣芳陆俊杰徐仁华
Owner YANGZHOU UNIV
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