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Preparation method of NiO/carbon nanospheres with core-shell structures

A carbon nanosphere, core-shell structure technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of process difficulty, complicated operation, complicated preparation method, etc., and achieve good cycle stability. High performance, simple process, good dispersion effect

Inactive Publication Date: 2017-09-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these microsphere composites have disadvantages such as relatively complicated preparation methods, such as the former requires reflux treatment, and the latter requires two-step hydrothermal treatment, which increases the difficulty of the process and the complexity of the operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Measure ammonia water, water, absolute ethanol, nickel nitrate hexahydrate, tetraethyl orthosilicate, formaldehyde solution, resorcinol and For cetyltrimethylammonium bromide, first mix ammonia, water and absolute ethanol evenly, then add nickel nitrate hexahydrate, stir for 10 minutes, then add resorcinol and cetyltrimethylammonium bromide in turn, Continue to stir for 30 minutes, then add formaldehyde solution and tetraethyl orthosilicate, stir for 24 hours, and then conduct a hydrothermal reaction at 100°C for 24 hours to obtain NiO and SiO 2 Nanoparticles of polymer nanospheres. Put it in a tube furnace, and carbonize it at a rate of 1°C / min from room temperature to 700°C under a nitrogen atmosphere, and finally remove SiO in the product with a NaOH solution with a concentration of 3mol / L 2 , to obtain NiO / carbon nanospheres with core-shell structure. The consumption of above-mentioned NaOH solution is the SiO in the product 2 12 times the mass.

Embodiment 2

[0018] Measure ammonia water, water, absolute ethanol, nickel nitrate hexahydrate, tetraethyl orthosilicate, formaldehyde solution, resorcinol and Cetyltrimethylammonium bromide, first mix ammonia, water and absolute ethanol evenly, add nickel nitrate hexahydrate, stir for 30min, then add resorcinol and cetyltrimethylammonium bromide, Continue to stir for 30 minutes, then add formaldehyde solution and tetraethyl orthosilicate, stir for 24 hours, and then conduct a hydrothermal reaction at 100°C for 24 hours to obtain NiO and SiO 2 Nanoparticles of polymer nanospheres. Put it in a tube furnace, and carbonize it from room temperature to 750°C at a heating rate of 4°C / min under a nitrogen atmosphere, and finally remove SiO in the product with a NaOH solution with a concentration of 3mol / L 2 , to obtain NiO / carbon nanospheres with a core-shell structure; the amount of the above NaOH solution is the SiO in the product 2 12 times the mass.

Embodiment 3

[0020] Measure ammonia water, water, absolute ethanol, nickel nitrate hexahydrate, tetraethyl orthosilicate, formaldehyde solution, resorcinol and Cetyltrimethylammonium bromide, first mix ammonia, water and absolute ethanol evenly, add nickel nitrate hexahydrate, stir for 80min, then add resorcinol and cetyltrimethylammonium bromide in turn, Continue to stir for 30 minutes, then add formaldehyde solution and tetraethyl orthosilicate, stir for 24 hours, and then conduct a hydrothermal reaction at 100°C for 24 hours to obtain NiO and SiO 2 Nanoparticles of polymer nanospheres. Put it in a tube furnace, and carbonize it from room temperature to 800°C at a heating rate of 8°C / min under a nitrogen atmosphere, and finally remove SiO in the product with a NaOH solution with a concentration of 3mol / L 2 , to obtain NiO / carbon nanospheres with core-shell structure. The consumption of above-mentioned NaOH solution is the SiO in the product 2 12 times the mass.

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PUM

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Abstract

The invention relates to a preparation method of NiO / carbon nanospheres with core-shell structures. The preparation method comprises the steps of weighing aqueous ammonia, water, anhydrous ethyl alcohol, nickel(II) nitrate hexahydrate, tetraethyl orthosilioate, a formaldehyde solution, resorcinol and cetyl trimethyl ammonium bromide according to a mass part ratio of: 0.3-1.2:100:31.6:0.05-0.25:4.7:1.4:1:1, evenly mixing the aqueous ammonia, the water and the anhydrous ethyl alcohol and then adding the nickel(II) nitrate hexahydrate therein, stirring the mixture for 10 to 120 minutes, adding the resorcinol and the cetyl trimethyl ammonium bromide into the mixture in sequence, stirring the mixture for 30 min and then adding the formaldehyde solution and the tetraethyl orthosilioate into the mixture, stirring the mixture for 24 h and then subjecting the mixture to hydrothermal reaction for 24 h at the temperature of 100 DEG C, placing the reaction product in a tube furnace, increasing the temperature from room temperature to 700-900 DEG C at a rate of 1-10 DEG C / min in a nitrogen atmosphere for carbonization, removing SiO2 in the product by using a NaOH solution with the concentration of 3 mol / L to obtain the NiO / carbon nanospheres with the core-shell structures. The preparation method has the advantages of simple process and simple operation, and the prepared NiO / carbon nanospheres exhibit high specific capacitance and good cycling stability when serving as an electrode material of a supercapacitor.

Description

technical field [0001] The invention relates to a method for preparing NiO / carbon nanospheres with a core-shell structure, belonging to the technical field of material preparation. Background technique [0002] Energy issues have received widespread attention in recent years. Supercapacitors have good application prospects in energy vehicles and consumer electronics due to their environmental friendliness and long cycle life. Porous carbon materials are widely used as electrode materials for supercapacitors because of their advantages such as high specific surface area, good electrical conductivity, and stable structure. However, porous carbon materials have the disadvantage of low specific capacitance. Relatively speaking, transition metal oxides such as nickel oxide and manganese oxide have the advantages of low price, wide source of raw materials, and high specific capacitance, but they also have disadvantages such as poor cycle stability. Therefore, the study of transit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/36H01G11/24B82Y30/00B82Y40/00
CPCY02E60/13H01G11/86B82Y30/00B82Y40/00H01G11/24H01G11/36H01G11/46
Inventor 甘礼华甘源刘明贤
Owner TONGJI UNIV
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