Nitrogen-containing hierarchical porous carbon/graphene composite material, preparation method and application thereof

A composite material, graphene technology, applied in the field of materials, can solve the problems of increasing electrolyte ion transport resistance, supercapacitor capacitance performance impact, low specific surface area utilization, etc., to enhance the pseudocapacitance effect, avoid stacking and agglomeration, high Effect of magnification performance

Active Publication Date: 2018-11-23
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of pure graphene, due to the strong π-π force between the sheets, it is easy to stack and agglomerate each other, which leads to low utilization of its specific surface area and increases the resistance of electrolyte ion transmission. , thus having a certain influence on the capacitive performance of the supercapacitor

Method used

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  • Nitrogen-containing hierarchical porous carbon/graphene composite material, preparation method and application thereof
  • Nitrogen-containing hierarchical porous carbon/graphene composite material, preparation method and application thereof
  • Nitrogen-containing hierarchical porous carbon/graphene composite material, preparation method and application thereof

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Effect test

Embodiment 1

[0033] Disperse 2mg of graphene oxide powder in 20mL of deionized water and ultrasonicate for 1h to obtain a stably dispersed graphene oxide dispersion with a concentration of 0.1mg / mL; then add 0.5g of chitosan and 20mL of acetic acid to the graphene oxide dispersion solution (0.5vol.%), stirred at room temperature for 1 h to form a uniformly dispersed mixed solution. Add 0.4 mL of glutaraldehyde solution (25wt.%) to the above mixed solution under stirring as a cross-linking agent. After uniform dispersion, leave the mixed solution at room temperature to allow the solution to undergo a cross-linking reaction until it is completely cross-linked. A clear hydrogel was obtained. The fully cross-linked hydrogels were subjected to hierarchical freezing at 4°C, 0°C, and -20°C in sequence, and then freeze-dried in a freeze dryer to obtain chitosan / graphene airgel materials with a multi-level pore structure. ; Move the chitosan / graphene airgel material to a tube furnace, raise the te...

Embodiment 2

[0037]Disperse 4mg of graphene oxide powder in 20mL of deionized water, and ultrasonicate for 1h to obtain a stably dispersed graphene oxide dispersion with a concentration of 0.2mg / mL; then add 0.5g of chitosan and 20mL of acetic acid to the graphene oxide dispersion solution (0.5vol.%), stirred at room temperature for 1 h to obtain a uniformly dispersed mixed solution; under stirring conditions, 0.4 mL of glutaraldehyde solution (25 wt.%) was added to the mixed solution as a cross-linking agent, and after uniform dispersion, the Put it down to make the mixed solution undergo cross-linking reaction until it is completely cross-linked to obtain a transparent hydrogel; the fully cross-linked hydrogel is first subjected to graded freezing at 4°C, 0°C, and -20°C, and then freeze-dried Freeze-dry in the machine to obtain the chitosan / graphene airgel material with multi-level pore structure; move the chitosan / graphene airgel material to a tube furnace, and heat it at a temperature o...

Embodiment 3

[0041] Disperse 10mg of graphene oxide powder in 20mL of deionized water, and ultrasonicate for 1h to obtain a stably dispersed graphene oxide dispersion with a concentration of 0.5mg / mL; then add 0.5g of chitosan and 20mL of acetic acid to the graphene oxide dispersion solution (0.5vol.%), stirred at room temperature for 1h to form a uniformly dispersed mixed solution; continue to stir and add 0.4mL glutaraldehyde solution (25wt.%) to this mixed solution as a cross-linking agent, after the dispersion is uniform, the The mixed solution was left standing at room temperature to allow the solution to undergo a cross-linking reaction until it was completely cross-linked to obtain a transparent hydrogel; the fully cross-linked hydrogel was first graded and frozen at 4°C, 0°C, and -20°C. Then freeze-dry in freeze dryer, obtain the chitosan / graphene airgel material of multi-level hole structure, then chitosan / graphene airgel is moved in the tube furnace, the tube furnace temperature i...

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Abstract

The invention discloses a nitrogen-containing hierarchical porous carbon / graphene composite material and a preparation method and an application thereof. Hydrogel is formed by cross-linking graphene oxide and chitosan with glutaraldehyde. Then, a nitrogen-containing hierarchical porous carbon / graphene composite material activated at high temperature is obtained through freeze drying and chemical activation. According to the method, easy-to-get chitosan is used as a carbon source, doped graphene is used to increase the conductivity, and a hierarchical porous structure is prepared by means of freeze drying and chemical activation. The nitrogen-containing hierarchical porous carbon / graphene composite material prepared in the invention has a high specific surface area, is of a hierarchical porous structure, is doped with hetero atoms, and has excellent specific capacitance performance and high power density. For an electrode prepared, the specific capacitance in 6 mol / L KOH electrolyte at the current density of 1 A / g is up to 320 F / g, the specific capacitance is kept at 225 F / g at the current density of 20 A / g, and very high rate performance is showed.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a nitrogen-containing multi-level porous carbon / graphene composite material for supercapacitors, a preparation method and application thereof. Background technique [0002] Supercapacitor is a new type of green and environmentally friendly physical energy storage device between traditional capacitors and batteries that has emerged with the breakthrough of material science in recent years. It is the most promising type of technical device in physical energy storage. A good complement to other electrochemical energy storage technologies. This kind of device can not only store more energy, but also release the stored energy quickly, and its charging cycle can reach 100,000 times, which is superior to traditional capacitors in performance. With the advantages of fast charge-discharge performance, long cycle life and high energy density, supercapacitors are used in distributed power station ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/44H01G11/24
CPCY02E60/13
Inventor 童华孙光林沈新宇马丽娅吕松
Owner WUHAN UNIV
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