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Preparation method of hollow mesoporous carbon material

A technology of mesoporous carbon and carbon materials, which is applied in the field of preparation of hollow mesoporous carbon materials, can solve the problems of slow charging speed, reduced electric capacity, large pores lacking ions, etc., and achieves the effect of improving charging efficiency and reducing charging time.

Inactive Publication Date: 2014-09-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The diameter of most of the micropores in the existing mesoporous materials is less than 2nm, the pore diameter is single, and there is a lack of macropores that can effectively transport ions. As a result, many micropores are not fully utilized when they are used as capacitor electrode materials, and the charging speed is relatively slow. What's more, after a period of use, "dead holes" will appear, and the capacitance will be seriously reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation of hollow mesoporous carbon material, the steps are as follows:

[0026] Take 10g of metal Ti powder with a particle size of 20-30μm, take CH 4 It is a carbon source gas, reacted at 800 °C for 5 hours, and the heating rate is 15 °C / min to obtain a composite powder with carbide on the surface and elemental material in the middle. The composite powder obtained above is put into a high-temperature furnace to carry out chlorination etching, the reaction gas is chlorine, the carrier gas is nitrogen, and the V 氯气 : V 氮气 =1:1. The temperature was 400 °C, and the reaction was performed for 6 h to obtain a hollow mesoporous carbon material.

[0027] The hollow mesoporous carbon material prepared in this example has a hollow pore diameter of 15.7 μm and an average pore diameter of 1.6 nm. When the current density is 0.5A / g, the specific capacitance is 260F / g, and the charging time is shortened by 45% compared with the existing material.

Embodiment 2

[0029] A kind of preparation of hollow mesoporous carbon material, the steps are as follows:

[0030] Take 10g of metal Ti powder with a particle size of 35-45μm, and take CH 3 CH 3 It is a carbon source gas, reacted at 1000°C for 4h, and the heating rate is 15°C / min to obtain a composite powder with carbide on the surface and elemental material in the middle. The composite powder obtained above is put into a high-temperature furnace to carry out chlorination etching, the reaction gas is chlorine, the carrier gas is argon, and the V 氯气 : V 氩气 =1:1, the temperature is 800°C, and the reaction is performed for 5h to obtain a hollow mesoporous carbon material.

[0031] The hollow mesoporous carbon material prepared in this example has a hollow pore diameter of 20.5 μm and an average pore diameter of 1.5 nm. When the current density is 0.5A / g, the specific capacitance is 280F / g, and the charging time is shortened by 48% compared with the existing material.

Embodiment 3

[0033] A kind of preparation of hollow mesoporous carbon material, the steps are as follows:

[0034] Take 10g of metal Ti powder with a particle size of 40-50μm, use CH 3 COCH 3 It is a carbon source gas, reacted at 1200 °C for 3 hours, and the heating rate is 15 °C / min to obtain a composite powder with carbide on the surface and elemental material in the middle. The composite powder obtained above is put into a high-temperature furnace to carry out chlorination etching, the reaction gas is chlorine, the carrier gas is a mixture of nitrogen and argon, and V 氯气 : V 氮气 : V 氩气 =1:0.5:0.5, the temperature is 1200°C, the heating rate is 15°C / min and the reaction is performed for 3h, to obtain a hollow mesoporous carbon material.

[0035] The hollow mesoporous carbon material prepared in this example has a hollow pore diameter of 25.4 μm and an average pore diameter of 1.3 nm. When the current density is 0.5A / g, the specific capacitance is 300F / g, and the charging time is shor...

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Abstract

The invention discloses a preparation method of a hollow mesoporous carbon material. The method comprises the following steps: carrying out surface carbonization on powder by taking the powder of Si, Ti, Cr or W and a gas containing carbon as raw materials so as to obtain a composite powder precursor of which the surface is of a carbide and the middle part is of a simple substance material; etching the obtained composite powder by utilizing chlorine to remove the Si, Ti, Cr or W element from the precursor so as to obtain the hollow mesoporous carbon material. The structure of the hollow mesoporous carbon material disclosed by the invention is different from that of a homogeneous mesoporous material in the prior art, namely, ions are effectively transported by virtue of hollow macropores, so that the fully utilization of micropores is realized. Thus, the phenomenon that the capacitance is obviously reduced due to the 'pore blocking' of a micropore structure is avoided. When the mesoporous carbon material with a hollow structure is applied to an electrode material of a capacitor, the charging efficiency is greatly improved and the charging time is obviously shortened.

Description

technical field [0001] The invention belongs to the field of preparation of mesoporous materials, in particular to a preparation method of a hollow mesoporous carbon material. Background technique [0002] Mesoporous carbon materials are widely used in supercapacitor electrode materials due to their large specific surface area. [0003] Supercapacitors should have the characteristics of short charging time and large capacitance. In order to obtain the above-mentioned properties, the capacitor electrode material needs to have a large specific surface area, and at the same time, there are macropores and micropores inside. The reason is that the carbon material has a large specific surface area, which can improve the capacitance, coexistence of macropores and micropores, the macropores transmit ions, and the micropores support ions, which improves the ion response speed and reduces the charging time. [0004] Most of the micropores in the existing mesoporous materials have a ...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 王升高张维孔垂雄杜祖荣邓泉荣王戈民王传新皮晓强李鹏飞
Owner WUHAN INSTITUTE OF TECHNOLOGY
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