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Method for preparing graded porous carbon with hollow mesoporous silicon spheres as templates

A hollow mesoporous and hierarchical porous technology, applied in nanotechnology and other directions, can solve the problems of complex preparation process, and achieve the effect of simple preparation process, large specific surface area, and suitable for large-scale production.

Inactive Publication Date: 2011-12-28
EAST CHINA UNIV OF SCI & TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Solving the complexity of the preparation process is the primary problem in realizing the practical application of hierarchical porous carbon in supercapacitors

Method used

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  • Method for preparing graded porous carbon with hollow mesoporous silicon spheres as templates
  • Method for preparing graded porous carbon with hollow mesoporous silicon spheres as templates
  • Method for preparing graded porous carbon with hollow mesoporous silicon spheres as templates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Stir 28ml of ethanol, 53ml of deionized water and 0.16g of cetyltrimethylammonium bromide at room temperature, then add 1ml of tetraethyl orthosilicate and 1ml of ammonia water, and continue stirring for 8 hours to obtain hollow mesoporous silicon spheres. Then add 0.5g of 20wt% ethanol solution of phenolic resin, continue to stir for 16 hours, pour it into a petri dish and place it in an oven to cure for 24 hours at 100°C, and put the resulting yellow powder in a tube furnace under nitrogen. The black powder was obtained after calcination at 800°C for 4 hours under the protection of 800°C. Finally, the hollow mesoporous silicon sphere template was removed with 5% hydrofluoric acid to obtain a uniformly dispersed hierarchical porous carbon with a hollow core and a mesoporous wall.

Embodiment 2

[0031] Stir 28ml of ethanol, 53ml of deionized water and 0.16g of hexadecyltrimethylammonium bromide at room temperature, then add 1ml of tetraethyl orthosilicate and 1ml of ammonia water, and continue stirring for 8 hours (6~8h is acceptable) Finally, hollow mesoporous silica spheres are obtained. Then add 2g of 20wt% ethanol solution of phenolic resin, continue to stir for 16 hours, pour it into a petri dish, put it in an oven and cure it for 24 hours at 100°C (80-160°C is acceptable), and put the obtained yellow powder Calcined in a tube furnace at 800°C (600-950°C) for 4 hours under the protection of nitrogen to obtain a black powder, and finally removed the hollow medium with 5% (5-20% concentration) hydrofluoric acid. Hierarchical porous carbon with hollow cores and mesoporous walls is obtained after being templated by porous silicon spheres.

example 3

[0032] Example 3 Characterization of porous carbon

[0033] The hierarchical porous carbon prepared in the above example 1 was characterized by specific surface area and pore size distribution with a transmission electron microscope (JEOL H-800) and a nitrogen adsorption-desorption analyzer (Micromeritics ASAP 2020) respectively, the results are as follows Figure 4 and shown in Table 2.

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Abstract

The invention discloses a method for preparing graded porous carbon with hollow mesoporous silicon spheres as templates. The prepared graded porous carbon can be used as an electrode material for a super capacitor. According to the method, specifically, hollow mesoporous silicon spheres are used as templates, and phenol-formaldehyde resin is used as a carbon source; with a nanometer casting method, an ethanol solution of phenol-formaldehyde resin is impregnated into mesoporous channels of the hollow mesoporous silicon spheres; phenol-formaldehyde resin is processed from primary curing, deep curing, carbonizing and template removing; and graded porous carbon with micropores, mesopores and micropores is prepared. Through the alterations of the hollow mesoporous silicon sphere particle sizes, hollow mesoporous silicon sphere wall thickness and the regulation of the phenol-formaldehyde resin amount, graded porous carbon parameters such as appearance, particle size, and wall thickness can be regulated. With the preparation method, the prices of the raw materials are low, the preparation technology is simple, and the prepared graded porous carbon has relatively high specific surface area and pore capacity. Therefore, the porous carbon can be used as the electrode material for the super capacitor.

Description

technical field [0001] The invention relates to a preparation method of hierarchical porous carbon in the field of chemical industry. Background technique [0002] With the increasingly prominent shortage of petroleum energy and the gradual enhancement of people's awareness of environmental protection, the development of new environmentally friendly and efficient electric energy has received extensive attention. As a new generation of energy storage devices, supercapacitors are receiving more and more attention because of their higher specific energy than ordinary capacitors, higher specific power than secondary batteries, longer cycle life, more temperature resistance and maintenance-free. more attention. Electrode material is an important factor affecting the performance of supercapacitors. Electrode materials for supercapacitors mainly include: carbon materials with high specific surface area, transition metal oxides, and conductive polymers. Among them, carbon material...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y40/00
Inventor 程起林夏玉明李春忠
Owner EAST CHINA UNIV OF SCI & TECH
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