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Hollow carbon sphere and preparation method and application thereof

A technology of hollow carbon spheres and polymerization reaction, applied in the direction of nano-carbon, etc., can solve the problems of unevenness, large wall thickness of hollow carbon spheres, cumbersome steps, etc., and achieve the effect of large specific surface area, large pore volume, and controllable wall thickness

Pending Publication Date: 2019-05-31
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the coating process, surfactants and reactants need to be added in multiple steps, the steps are cumbersome and require extremely fine control
In addition, the wall thickness of the hollow carbon spheres synthesized in the prior art is relatively large and uneven

Method used

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  • Hollow carbon sphere and preparation method and application thereof
  • Hollow carbon sphere and preparation method and application thereof
  • Hollow carbon sphere and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Mix resin monomer-resorcinol, ammonia water, deionized water, absolute ethanol, surfactant-hexadecyltrimethylammonium bromide (CTAB) and mix well to prepare solution A; Add ester (TEOS) to solution A to prepare solution B, keep the temperature of solution B at 40°C, hydrolyze ethyl orthosilicate for 1 hour to prepare silica suspension; suspend to silica at a dropping rate of 1ml / min Add formaldehyde solution to the liquid and carry out the first-stage polymerization reaction at 35°C for 24 hours; then transfer the solution to the reactor, keep the solution temperature at 80°C, and carry out the second-stage polymerization: hydrothermal reaction for 30 hours, and prepare two Silica-resin composite balls: After washing, filtering and drying the silica-resin composite balls, transfer them to a tube furnace, raise the temperature to 600°C in a nitrogen atmosphere, and keep the temperature for 20 hours to prepare silica-carbon composite balls ; The silicon dioxide-carbon com...

Embodiment 2～10

[0041] Examples 2 to 10, the preparation process is the same as that of Example 1, except that the molar concentration of resin monomer, the mass fraction of orthosilicate, the mass fraction of surfactant, and the volume ratio of alcohol and water are different, as shown in Table 1 .

[0042] The hollow carbon sphere obtained in embodiment 2 is denoted as MF-2.2-20, SEM figure (a) and TEM figure (b) are as figure 2 , it can be seen that the particle size of the hollow carbon spheres is basically the same, about 250nm, and the wall thickness is about 15nm, and the spheres are connected to each other. This is further verified in the box marked in the TEM image. .

[0043] The hollow carbon sphere obtained in embodiment 3 is denoted as MF-1.1-20, SEM figure (a) and TEM figure (b) are as image 3 , it can be seen that the particle size of the hollow carbon spheres is basically the same, about 250nm, and the wall thickness is about 30nm, and the spheres are connected to each oth...

Embodiment 11～20

[0047] The preparation process of Examples 11-20 is the same as that of Example 1, except that the hydrolysis temperature and time of tetraethyl orthosilicate, the polymerization reaction temperature and time, and the calcination temperature and time are different, as shown in Table 2.

[0048] Table 2.

[0049]

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Abstract

The invention discloses a hollow carbon sphere and a preparation method and application thereof. Firstly, a solution containing resin monomers, a surfactant, ammonia, water and alcohol is prepared, then orthosilicate is added into the solution, and orthosilicate is hydrolyzed to prepare silicon-dioxide suspension; a formaldehyde solution is added into the silicon-dioxide suspension for a polymerization reaction, and a silicon-dioxide resin composite sphere is obtained; the silicon-dioxide resin composite sphere is calcined to prepare a silicon-dioxide carbon composite sphere; silicon dioxide in the silicon-dioxide carbon composite sphere is removed through acid or alkali, and the hollow carbon sphere is obtained. The silicon-dioxide resin composite sphere is synthesized in one step, in other words, the synthesis of silicon dioxide and the resin coating process are combined to solve the problem that the two-step method of the prior art is cumbersome and needs fine regulation. The prepared hollow carbon sphere has a controllable wall thickness, a large pore volume and a large specific surface area.

Description

technical field [0001] The invention belongs to the technical field of carbon spheres, and in particular relates to a hollow carbon sphere and a preparation method and application thereof. Background technique [0002] In the prior art, the method steps for synthesizing hollow carbon spheres by using the hard template method are as follows: first, silica spheres with good monodispersity are prepared by hydrolyzing tetraethyl orthosilicate; second, the separated and washed The silica balls are uniformly dispersed in the solution by ultrasonic method, and the silica is coated by the polymerization of the precursor. Thirdly, the obtained resin-coated silica spheres are separated, washed and dried, and then subjected to high-temperature carbonization to obtain carbon-coated silica spheres. Fourth, use acid or alkali to remove the silica template, separate, wash and dry to obtain hollow carbon spheres. There are some deficiencies in the existing synthetic preparation process of...

Claims

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Application Information

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IPC IPC(8): C01B32/15
Inventor 张易宁程健张祥昕林俊鸿陈素晶王维陈远强苗小飞刘永川
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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