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Preparation method of nitrogen-doped core-shell hollow carbon

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

Active Publication Date: 2017-05-10
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 Disperse the balls into a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 8:1, add cetyltrimethylammonium bromide, ammonia water, resorcinol under magnetic stirring, 35 ℃ After stirring for 30 min, add formaldehyde, ammonia: resorcinol: SiO 2 : The mass ratio of formaldehyde: hexadecyltrimethylammonium bromide is 1: 3.5: 4: 5: 20; react for 3 h, age overnight, centrifuge and wash to obtain a hollow carbon precursor, and then prepare a 3 wt% hollow carbon precursor Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, add to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, and the mass ratio of empty carbon sphere precursor solution: hexadecyltrimethylammonium bromide: ammonia water is 2:1.6:10. After ultrasonication for 1-2 h, tetraethyl orthosilicate Add dropwise t...

Embodiment 2

[0015] SiO 2 Disperse the balls into a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 5:1, add cetyltrimethylammonium bromide, ammonia water, resorcinol under magnetic stirring, 35 ℃ After stirring for 30 min, add formaldehyde, ammonia: resorcinol: SiO 2 : The mass ratio of formaldehyde: hexadecyltrimethylammonium bromide is 1: 3.5: 8: 5: 20; react for 6 h, age overnight, and centrifuge to obtain a hollow carbon precursor, which is then formulated into a 3 wt% hollow carbon precursor Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, add to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, and the mass ratio of empty carbon sphere precursor solution: hexadecyltrimethylammonium bromide: ammonia water is 1:1.6:10. After ultrasonication for 1-2 h, tetraethyl orthosilicate Add dr...

Embodiment 3

[0017] SiO 2 Disperse the balls into a mixture of deionized water and ethanol, the volume ratio of deionized water and ethanol is 5:1, add cetyltrimethylammonium bromide, ammonia water, 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 into a 3 wt% hollow carbon precursor Carbon sphere precursor aqueous solution; weigh the hollow carbon sphere precursor aqueous solution (3 wt%), cetyltrimethylammonium bromide, ammonia water, add to the mixed solution of ethanol and deionized water, deionized water and ethanol The volume ratio is 1:1, and the mass ratio of empty carbon sphere precursor solution: hexadecyltrimethylammonium bromide: ammonia water is 3:1.6:10. After ultrasonication for 1-2 h, tetraethyl orthosilicate Add ...

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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 belongs to the technical field of carbon material manufacturing technology, and relates to a preparation method based on nitrogen-doped core-shell hollow carbon. The nitrogen-doped core-shell hollow carbon prepared by the invention can be widely used in electrochemical fields such as supercapacitors, capacitive desalination, and lithium-ion batteries. Background technique [0002] Due to its high specific surface area, unique hollow structure, and low cost, hollow carbon is currently widely used as a gas separation agent, a catalyst carrier, and an electrode material for supercapacitors. Surface modification of hollow carbons is an important method to improve their properties. Compared with pure carbon, carbon materials with surface modification such as heteroatom doping will show superior performance in some aspects. The traditional surface modification method is acid oxidation treatment, so that the surface has the following oxygen-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
Inventor 张登松施利毅王慧颜婷婷
Owner SHANGHAI UNIV