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Preparation method of graphene/hollow carbon nanometer balls

A technology of carbon nanospheres and graphene, applied in the field of materials, can solve the problems of inability to effectively improve the specific capacitance of materials and application limitations in the field of supercapacitors, and achieve good cycle stability, improved conductivity, and good dispersion

Inactive Publication Date: 2016-07-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reports have solved the agglomeration problem of graphene to a certain extent, but cannot effectively improve the specific capacitance of the resulting material, and its application in the field of supercapacitors is still limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take the ammonia water according to the volume parts: water: ethanol=1:2:16, and mix evenly to obtain solution A; take the ethyl orthosilicate according to the volume parts: ethanol=1:6, and mix evenly to obtain solution B, where positive The volume ratio of ethyl silicate to water in solution A is 1:4; while stirring, add solution B dropwise to solution A to obtain a mixed solution, and then add 1% of the total volume of the mixed solution silane coupling agent KH- 550, stirring for 10h, the resulting product was washed with water and ethanol, and then dried in vacuum at 50℃ to obtain KH-550 modified SiO 2 Nanosphere. Take KH-550 modified SiO according to mass parts 2 Nanosphere: water=1:100, ultrasonic for 1h to mix well, and then add the concentration of 1mg·mL -1 Graphene oxide solution, in which graphene oxide and SiO 2 The mass ratio of the nanospheres is 1:20. After stirring evenly, suction filtration, washing with water, and vacuum drying at 50°C to obtain SiO 2 N...

Embodiment 2

[0016] Take ammonia water by volume: water: ethanol = 1:3:18, mix well to obtain solution A; take ethyl orthosilicate by volume: ethanol = 1:8, mix well to obtain solution B, where positive The volume ratio of ethyl silicate to water in solution A is 1:6; while stirring, add solution B dropwise to solution A to obtain a mixed solution, and then add 1% of the total volume of the mixed solution silane coupling agent KH- 550, stirring for 12h, the resulting product was washed with water and ethanol, and dried in vacuum at 80℃ to obtain KH-550 modified SiO 2 Nanosphere. Take KH-550 modified SiO according to mass parts 2 Nanosphere: water=1:150, ultrasonic for 2h to mix well, and then add the concentration of 1mg·mL -1 Graphene oxide solution, in which graphene oxide and SiO 2 The mass ratio of the nanospheres is 1:40. After stirring evenly, suction filtration, washing with water, and vacuum drying at 80°C to obtain SiO 2 Nanosphere / graphene oxide. Take ammonia water according to ma...

Embodiment 3

[0018] Take the ammonia water according to the volume parts: water: ethanol=1:2.5:17, mix evenly to obtain solution A; take the ethyl orthosilicate according to the volume parts: ethanol=1:7, mix evenly to obtain solution B, where positive The volume ratio of ethyl silicate to water in solution A is 1:5; under stirring, add solution B dropwise to solution A to obtain a mixed solution, and then add 1% of the total volume of the mixed solution silane coupling agent KH- 550, stirring for 11h, the resulting product was washed with water and ethanol, and dried in vacuum at 60℃ to obtain KH-550 modified SiO 2 Nanosphere. Take KH-550 modified SiO according to mass parts 2 Nanosphere: water=1:120, ultrasonic for 2h to mix well, then add the concentration of 1mg·mL -1 Graphene oxide solution, in which graphene oxide and SiO 2 The mass ratio of the nanospheres is 1:30. After stirring evenly, suction filtration, washing with water, and vacuum drying at 60°C to obtain SiO 2 Nanosphere / graph...

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Abstract

The invention relates to a preparation method of graphene / hollow carbon nanometer balls, and belongs to the technical field of materials. Ammonia water, water and ethanol are mixed to obtain a solution A; ethyl orthosilicate and ethanol are mixed to obtain a solution B. Under the stirring condition, the solution B is added into the solution A drop by drop to obtain a mixed solution; a silane coupling agent KH-550 is added; stirring is performed for 10 to 12 hours; after an obtained product is washed, vacuum drying is performed to obtain KH-550 modified SiO2 nanometer balls. The nanometer balls are dispersed in water; a graphene oxide solution is added; stirring, suction filtration, washing and drying are performed, SiO2 nanometer balls / graphene oxide is obtained; the ammonia water, the water, the ethanol and the SiO2 nanometer balls / graphene oxide are subjected to ultrasonic mixing; m-dihydroxybenzene and a formaldehyde solution are added; after the materials are stirred for 24 hours, hydro-thermal treatment is performed for 24 hours; the obtained products are dried; then, the polymer nanometer balls containing SiO2 nanometer balls / graphene oxide are obtained. After the polymer nanometer balls are dried; carbonization is performed in the nitrogen atmosphere; next, SiO2 in the product is removed through a NaOH solution; the graphene oxide / hollow carbon nanometer balls are obtained. When the obtained graphene oxide / hollow carbon nanometer balls are used as a supercapacitor electrode material, high specific capacity and higher cycling stability are shown.

Description

Technical field [0001] The invention relates to a method for preparing graphene / hollow carbon nanospheres, and belongs to the technical field of materials. Background technique [0002] Supercapacitors have the characteristics of short charging time, high charging efficiency, long cycle life and no memory effect. They are very broad in the fields of mobile communications, information technology, industrial fields, consumer electronics, electric vehicles, aerospace and defense technology. Application prospects. Electrode material is one of the key factors affecting the main performance of supercapacitors. Due to its high specific surface area, low density and good chemical stability, carbon materials have become the most widely used electrode material for supercapacitors. Porous carbon nanospheres are a new type of carbon material with a spherical structure. They have broad application prospects in the fields of adsorption and separation, catalysis, photonic crystals, nanodevice...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2004/34C01P2004/50C01P2004/62C01P2006/12C01P2006/40
Inventor 甘礼华石梦辰刘明贤
Owner TONGJI UNIV
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