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Preparation method for nitrogen-doped nuclear shell hollow carbon

A hollow carbon and nitrogen doping technology, applied in the field of carbon material manufacturing process, can solve the problems of few adsorption sites, single pore structure, limited application, etc., and achieve the effects of easy operation, simple preparation process, and low requirements for experimental equipment.

Active Publication Date: 2015-10-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore structure of hollow carbon before and after modification is relatively simple, which is not conducive to diffusion and mass transfer, which limits its application.
In addition, the inner surface of the hollow carbon before and after modification is often not effectively utilized, so the utilization rate of the surface and the adsorption sites are relatively few.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] SiO 2 The balls are dispersed in a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 8:1, add cetyltrimethylammonium bromide, ammonia, resorcinol under magnetic stirring, 35℃ After stirring for 30 min, add formaldehyde, ammonia: resorcinol: SiO 2 : The mass ratio of formaldehyde: cetyltrimethylammonium bromide is 1:3.5:4:5:20; reacted for 3 h, aged overnight, centrifuged and washed to obtain a hollow carbon precursor, and then formulated into a 3 wt% hollow Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, and add them to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, the mass ratio of the precursor aqueous solution of the empty carbon ball: the cetyltrimethylammonium bromide: the ammonia water is 2:1.6:10. After sonication for 1-2 h, the tetraethyl orthosilicate Add dro...

Embodiment 2

[0015] SiO 2 The spheres are dispersed in a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 5:1, add cetyltrimethylammonium bromide, ammonia, resorcinol under magnetic stirring, 35℃ After stirring for 30 min, add formaldehyde, ammonia: resorcinol: SiO 2 : The mass ratio of formaldehyde: cetyltrimethylammonium bromide is 1:3.5:8:5:20; reacted for 6 hours, aged overnight, centrifuged and washed to obtain a hollow carbon precursor, and then formulated into a 3 wt% hollow Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, and add them to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, the mass ratio of the aqueous solution of the empty carbon ball precursor: the cetyltrimethylammonium bromide: the ammonia is 1:1.6:10. After sonication for 1-2 h, the tetraethyl orthosilicate Add dro...

Embodiment 3

[0017] SiO 2 The spheres are dispersed in a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 5:1, add cetyltrimethylammonium bromide, ammonia, resorcinol under magnetic stirring, 35℃ After stirring for 30 min, add formaldehyde, ammonia: resorcinol: SiO 2 : The mass ratio of formaldehyde: cetyltrimethylammonium bromide is 1:3.5:6:5:20; reacted for 5 h, aged overnight, centrifuged and washed to obtain a hollow carbon precursor, and then formulated to 3 wt% empty Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, and add them to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, and the mass ratio of the aqueous solution of the empty carbon ball precursor: the cetyltrimethylammonium bromide: the ammonia is 3:1.6:10. After sonication for 1-2 h, the tetraethyl orthosilicate Add dropwise...

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PUM

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Abstract

The invention belongs to the technical field of carbon material manufacturing processes and relates to a preparation method method based on preparing nitrogen-doped nuclear shell hollow carbon. The preparation method is characterized in that silicon dioxide balls are utilized as formworks, after the surfaces of the silicon dioxide balls are wrapped with phenolic resin, multilayer wrapping with mesoporous silicon dioxide and nitrogen-containing polymers is conducted, core-shell structures are formed, the calcination is controlled, pomegranate-shaped core-shell materials are formed, cores are made of nano-scale hollow fractional porous carbon, and shells are made of nitrogen-doped ultrathin mesoporous carbon. By means of the preparation method, the fractional open-framework structure, the nano-scale particle size, the high electrical conductivity and the high wetability are achieved, the method is simple, the process is easy to control, and the preparation method can be widely applied to the electrochemistry fields such as supercapacitors, capatitive type desalination and lithium ion batteries.

Description

Technical field [0001] The invention is a carbon material manufacturing technology field, involving a preparation method based on nitrogen -based nuclear shell hollow carbon.The nitrogen doped nuclear shell hollow carbon prepared by the present invention can be widely used in electrochemical fields such as supercapacitors, capacitive dehydration, and lithium ion batteries. Background technique [0002] Due to the characteristics of its high ratio, unique hollow structure, low cost, etc., hollow carbon is currently widely used as gas separatists, catalysts, and electrode materials for supercapacitors.The surface modification of hollow carbon is an important way to improve its performance.Compared with pure carbon, carbon materials after the surface modification, such as miscellaneous atoms, will show better performance in some ways.The traditional surface modification method is acid oxidation treatment, so that its surface has an oxygen-containing energy group (-OH, -Cooh), which ...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 张登松施利毅王慧颜婷婷
Owner SHANGHAI UNIV
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