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Preparation method of mesoporous carbon nanosheet and application of mesoporous carbon nanosheet as electrode material of super capacitor

A technology of nanosheets and mesoporous carbon, which is applied in the direction of hybrid capacitor electrodes, capacitors, electrolytic capacitors, etc., can solve the problems of reducing the specific surface area of ​​graphene and ion transmission speed, etc., to achieve the advantages of transmission and diffusion, large specific capacity, and improved Effect of specific surface area and pore volume

Active Publication Date: 2012-09-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the van der Waals force between graphene sheets, it inevitably agglomerates and accumulates, which greatly reduces the specific surface area and ion transmission speed of graphene.

Method used

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  • Preparation method of mesoporous carbon nanosheet and application of mesoporous carbon nanosheet as electrode material of super capacitor
  • Preparation method of mesoporous carbon nanosheet and application of mesoporous carbon nanosheet as electrode material of super capacitor
  • Preparation method of mesoporous carbon nanosheet and application of mesoporous carbon nanosheet as electrode material of super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 0.4g P123 in 400ml buffer solution containing 0.5g Tris, then ultrasonically disperse 0.4g magnesium oxide nanoflakes in the above solution, after cooling to room temperature, add 0.8g dopamine under stirring, and stir the reaction in air at 25°C 5h. Filtrate and wash the polydopamine / magnesium oxide composite, raise the temperature to 350°C at a rate of 1°C / min in an argon atmosphere, keep the temperature for 2 hours, and then raise the temperature to 850°C at a rate of 5°C / min for further carbonization After 4 hours, the template was finally removed in excess acid solution to obtain two-dimensional mesoporous carbon nanosheets. The scanning electron microscope photograph of the product is as figure 1 shown.

Embodiment 2

[0028] Dissolve 0.4g P123 in 400ml buffer solution containing 0.5g Tris, then ultrasonically disperse 0.4g magnesium oxide nanosheets in the above solution, cool to room temperature, add 1.6g dopamine under stirring, 25°C (10-40°C) The reaction was stirred in air for 5h. Filtrate and wash the polydopamine / magnesium oxide complex obtained, in an argon atmosphere at a heating rate of 1 °C / min to 350 °C (300~350 °C is acceptable), keep the temperature for 2 hours, and then at a rate of 5 °C / min The temperature was raised to 850°C (800-900°C is acceptable), further carbonized for 4 hours, and finally the template was removed in excess acid solution to obtain two-dimensional mesoporous carbon nanosheets. The scanning electron microscope photograph of the product is as figure 2 shown.

Embodiment 3

[0029] Example 3 Characterization of Mesoporous Carbon Nanosheets

[0030] Nitrogen adsorption-desorption analyzer (Micromeritics ASAP 2020) was used to characterize the specific surface area and pore size distribution of the mesoporous carbon nanosheets prepared in the above example 1, the results are as follows image 3 and shown in Table 1.

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Abstract

The invention relates to preparation of a mesoporous carbon nanosheet and application of the mesoporous carbon nanosheet as an electrode material in a super capacitor. According to the method, a porous magnesium oxide nanosheet is used as a template, dopamine is used as a carbon precursor, a carbon source is uniformly coated on the surface of the magnesium oxide nanosheet to form a complex, the complex is carbonized at a high temperature, and the magnesium oxide of the template is removed with excess sulfuric acid solution to obtain a two-dimensional carbon nanosheet. Triblock copolymer PEO-PPO-PEO (Polyethylene Oxide-Polyphenylene Oxide-Polyethylene Oxide) added in a preparation process is used as a structure directing agent to form a mesoporous structure, so that the specific surface area and the pore capacity of the carbon nanosheet are improved and transmission and diffusion of electrolyte ions are facilitated to improve the electric capacity of the material. The coating thickness of the carbon source on the surface of the template can be effectively controlled by adjusting the mass ratio of the template to the carbon source and the polymerization reaction time of the dopamine, and correspondingly the carbon nanosheets with different thicknesses are obtained, so that the electrochemical performance of the carbon nanosheet is affected.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a preparation method of a supercapacitor electrode material, in particular to a preparation of mesoporous carbon nanosheets. Background technique [0002] With the rapid development of microelectronics technology, traditional physical capacitors used as backup power sources have been difficult to meet the growing demand for energy storage. At the same time, with the development of science and technology and society, many occasions such as electric vehicles have higher and higher requirements for power supply, which is far beyond the capacity of today's batteries. In this context, a new type of energy storage element—supercapacitor has been developed rapidly. Compared with traditional capacitors and secondary batteries, the specific power of supercapacitors has reached more than ten times that of batteries, and the storage capacity of supercapacitors is higher than that of ordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01G9/058H01G11/24H01G11/86
CPCY02E60/13
Inventor 李春忠严燕芳程起林姜立学江浩
Owner EAST CHINA UNIV OF SCI & TECH
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