Method for preparing graphene aerogel and graphene/ metallic oxide aerogel

A graphene airgel and graphene technology, applied in the direction of graphene, hybrid/electric double-layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve the problems of not using cross-linking agents, and achieve low price, environmental friendliness, and process simple effect

Inactive Publication Date: 2013-11-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene airgel prepared by hydrothermal method in patent CN201210376937.X, but does not use crosslinking agent

Method used

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  • Method for preparing graphene aerogel and graphene/ metallic oxide aerogel
  • Method for preparing graphene aerogel and graphene/ metallic oxide aerogel
  • Method for preparing graphene aerogel and graphene/ metallic oxide aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Firstly, the graphite oxide was ground to refine the particles, and then mixed with deionized water to form a graphite oxide aqueous solution with a concentration of 2 mg / mL. Then 2 mL of methanol was added to 15 mL of the aqueous solution of graphite oxide. Mechanically stir the obtained mixture for 1 hour and ultrasonically oscillate for 2 hours for dispersion treatment, then put it into a 25mL hydrothermal reaction kettle, place the assembled reaction kettle at a temperature of 120°C for 2 hours, and obtain graphene after cooling down naturally liquid gel. The prepared graphene liquid gel is dried by freeze-drying technology, and then the graphene aerogel is obtained. The obtained graphene airgel was placed in N 2 Calcination at 200°C for 1 h under gas protection for optimization treatment to obtain the final graphene airgel.

[0039] The obtained graphene airgel material is cut into thin slices of about 0.2 mg with a knife and placed in two pieces of nickel foam ...

Embodiment 2

[0041] Firstly, the graphite oxide was ground to refine particles, and then mixed with deionized water to prepare a graphite oxide aqueous solution with a concentration of 4 mg / mL. Then 4 mL of ethanol was added to 15 mL of the aqueous solution of graphite oxide. Mechanically stir the obtained mixture for 1 hour and ultrasonically oscillate for 2 hours for dispersion treatment, then put it into a 25mL hydrothermal reaction kettle, place the assembled reaction kettle at a temperature of 140°C for 2 hours, and obtain graphene after cooling down naturally liquid gel. The prepared graphene liquid gel is dried by freeze-drying technology, and then the graphene aerogel is obtained. The obtained graphene airgel was placed in N 2 Calcination at 220°C for 2 h under gas protection for optimization treatment to obtain the final graphene airgel.

[0042] The obtained graphene airgel material is cut into thin slices of about 0.2 mg with a knife and placed in two pieces of nickel foam as...

Embodiment 3

[0044] Firstly, the graphite oxide was ground to refine the particles, and then mixed with deionized water to prepare a graphite oxide aqueous solution with a concentration of 6 mg / mL. Then 4 mL of propanol was added to 25 mL of the aqueous solution of graphite oxide. The obtained mixture was mechanically stirred for 2 hours and ultrasonically oscillated for 4 hours for dispersion treatment, and then put into a 50mL hydrothermal reaction kettle. After the assembled reaction kettle was placed at a temperature of 180°C, it was kept for 2 hours, and graphene was obtained after cooling down naturally. liquid gel. The prepared graphene liquid gel is dried by freeze-drying technology, and then the graphene aerogel is obtained. The obtained graphene airgel was placed in N 2 Calcination at 400°C for 3 h under gas protection was carried out for optimization, and the final graphene airgel was obtained.

[0045] The obtained graphene airgel material is cut into thin slices of about 0....

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Abstract

The invention discloses a method for preparing graphene aerogel and graphene/ metallic oxide aerogel. The method is characterized in that graphite oxide aqueous solution serves as a raw material, alcohol serves as a cross-linking agent, a precursor solution is obtained through the simple mixing and dispersing processes, the hydrothermal method is adopted, the freeze drying method or a supercritical drying method is adopted, and then the graphene aerogel is obtained . The graphene/ metallic oxide aerogel can be prepared by adding metallic oxide into the polymeric precursor solution. On one hand, the graphene vinyl aerogel material has the characteristic of the graphene aerogel, and on the other hand, the graphene vinyl aerogel material can have the physicochemical characteristic of the metallic oxide. In addition, the aerogel material has a large specific surface and good electrical conductivity, can directly serve as a supercapacitor electrode, and has large specific capacity, good rate capability and cycling stability. The materials used in the method are low in cost, the industrial process is simple, and the method is friendly to the environment.

Description

technical field [0001] The invention belongs to the field of capacitor electrode materials, and relates to a method for preparing graphene aerogel and graphene / metal oxide aerogel by using graphite oxide and alcohol as raw materials, and specifically relates to a method for preparing graphene airgel and graphene / metal oxide aerogel by using graphite oxide and alcohol as raw materials. Graphene airgel and graphene / metal oxide airgel supercapacitor electrode materials. Background technique [0002] How to guarantee the energy supply in the future is one of the important issues that mankind is facing in this century. The depletion of fossil energy and global warming have made people pay more and more attention to the use of renewable energy, and vigorously developing clean energy vehicles has become an irreversible trend, which is also accompanied by a huge demand for electrical energy storage equipment. Efficient energy storage and conversion technology is one of the key tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/38H01G11/46H01G11/24H01G11/86C01B31/04C01B32/184
CPCY02E60/13
Inventor 范丽珍鞠鸿飞
Owner UNIV OF SCI & TECH BEIJING
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