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Preparation method of three-dimensional porous carbon

A three-dimensional porous, dopamine technology, applied in the field of porous materials, can solve the problems of complex methods, difficult to prepare in large quantities, and many steps, and achieve the effects of simplifying process steps, avoiding purification steps, and reducing equipment loss.

Active Publication Date: 2018-11-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have many steps, complex methods, are difficult to prepare in large quantities, and the specific surface area of ​​the product obtained is not high enough (generally less than 2000m 2 / g), additional acid (H 3 PO 4 ) or alkali (KOH) activation and other issues

Method used

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  • Preparation method of three-dimensional porous carbon
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  • Preparation method of three-dimensional porous carbon

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preparation example Construction

[0030] A preparation method of the three-dimensional porous carbon of the present invention, comprising the following steps:

[0031] Mix the sugar source, dopamine and ammonium chloride evenly, raise the resulting mixture from room temperature to 250°C~300°C under the protection of an inert atmosphere, then accelerate the temperature rise to 800°C~1200°C, and then sinter at constant temperature for 2h~ 6h, cooled to room temperature to obtain a self-supporting three-dimensional porous carbon.

[0032] In the above preparation method, the mass ratio of sugar source and dopamine is 4~100:1 (i.e. 99:1~80:20), the ratio of the total mass of sugar source and dopamine to the mass of ammonium chloride is 0.2~5:1 (ie 1:5 ~ 5:1).

[0033] In the above preparation method, when the room temperature rises to 250°C to 300°C, the heating rate is 1°C / min to 10°C / min, and the temperature is kept for 0 to 3 hours; in the accelerated and continuous heating stage, the heating rate is 2°C / min t...

Embodiment 1

[0037] A preparation method of the three-dimensional porous carbon of the present invention, comprising the following steps:

[0038] Mix 2 g of glucose, 0.1 g of dopamine, and 2 g of ammonium chloride evenly, and place the resulting mixture in a tube furnace. min continued to rise to 1000°C, kept at a constant temperature for 3 hours, and then naturally cooled to room temperature to obtain a self-supporting three-dimensional porous carbon.

[0039] Characterize the self-supporting three-dimensional porous carbon prepared in this example, figure 1 is an optical photograph of three-dimensional porous carbon, figure 2 As a scanning electron microscope photo, it can be seen that there are many channel structures on the surface of the sample. image 3 is the nitrogen adsorption-desorption curve of the sample, and the BET specific surface area is 2600m 2 / g.

Embodiment 2

[0041] A preparation method of the three-dimensional porous carbon of the present invention, comprising the following steps:

[0042] Mix 2 g of glucose, 0.02 g of dopamine and 2 g of ammonium chloride evenly, place the resulting mixture in a tube furnace, and under the condition of nitrogen protection, first raise the temperature from room temperature to 250 °C at 2 °C / min, keep it warm for 2 hours, and then Continue to heat up to 1000°C at 8°C / min, keep the temperature for 3 hours, and then cool down to room temperature naturally to obtain a self-supporting three-dimensional porous carbon.

[0043] Characterize the self-supporting three-dimensional porous carbon prepared in this example, Figure 4 is an optical photograph of a self-supporting 3D porous carbon, Figure 5 As a scanning electron microscope photo, it can be seen that there are many channel structures on the surface, Figure 6 is the nitrogen adsorption-desorption curve of the sample, and the BET specific surfa...

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Abstract

The invention discloses a preparation method of three-dimensional porous carbon. The preparation method comprises the following steps: uniformly mixing a sugar source, dopamine and ammonium chloride,heating the obtained mixture from room temperature to 250-300 DEG C under the protection of an inert atmosphere, accelerating temperature rise to 800-1200 DEG C, and sintering at constant temperaturefor 2h-6h, and cooling to room temperature to obtain the self-supported three-dimensional porous carbon. By the preparation method, only one step of pyrolysis is performed without any additional stepsto obtain the self-supported three-dimensional porous carbon having a specific surface area of up to 2700 m<2> / g.

Description

technical field [0001] The invention belongs to the field of porous materials, and relates to a preparation method of three-dimensional porous carbon, in particular to a preparation method of high specific surface area self-supporting three-dimensional porous carbon. Background technique [0002] Self-supporting three-dimensional porous carbon materials have a wide range of applications in the fields of catalysis, energy, and environment due to their rich pore structure, high specific surface area, and good electrical conductivity. In order to maximize its effect, the preparation of three-dimensional porous carbon with high specific surface area has always been the direction of people's efforts. At present, the preparation methods of self-supporting three-dimensional porous carbon can be roughly divided into four categories: one is the self-assembly method of graphene oxide, including hydrothermal treatment method, freeze-drying method, vacuum evaporation method, and drop co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/342C01B32/348
CPCC01B32/318C01B32/342C01B32/348
Inventor 陶呈安肖涵波王芳王建方李玉姣阳绪衡宋琛超陈瑞
Owner NAT UNIV OF DEFENSE TECH
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