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Preparation method of graphene aerogel and graphene-carbon nanotube aerogel

A graphene aerogel and carbon nanotube technology, which is applied in the field of aerogels, can solve the problems of environmental hazards, low electrical conductivity, and affect the performance of graphene aerogels, so as to achieve no pollution in energy consumption and acceptable appearance. control, the effect of excellent physical and chemical properties

Inactive Publication Date: 2015-03-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon-oxygen ratio of graphene made by the above-mentioned reducing agent is low (<20), and the conductivity is not high, and the carbon-oxygen ratio of the graphene airgel made by this graphene assembly is also low, which means Will directly affect the final performance of graphene airgel
In addition, the above-mentioned reducing agents, except sugar compounds and ascorbic acid, are toxic or corrosive, which is harmful to the environment

Method used

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  • Preparation method of graphene aerogel and graphene-carbon nanotube aerogel
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  • Preparation method of graphene aerogel and graphene-carbon nanotube aerogel

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Embodiment 1

[0035] The present embodiment prepares graphene airgel, specifically comprises the following steps:

[0036] (1) Graphene oxide is added to deionized water, ultrasonically dispersed until uniformly mixed, and a graphene oxide aqueous solution having a mass concentration of 4.0 mg / ml is obtained;

[0037] (2) the graphene oxide aqueous solution prepared in step (1) is carried out to supercritical drying, and graphene oxide airgel is obtained;

[0038] (3) After mixing the graphene oxide airgel prepared in step (2) with magnesium powder, place it in a reactor for magnesia thermal reaction. After the reaction is finished, soak the reaction product in an acidic aqueous solution, and then freeze After drying, the graphene airgel is obtained.

[0039] The graphene oxide described in step (1) is prepared by Hummers chemical method.

[0040]The specific process of preparing graphene oxide by Hummers chemical method: put a 500mL reaction bottle in an ice bath, add an appropriate amou...

Embodiment 2

[0053] The preparation of graphene-carbon nanotube airgel in this embodiment specifically includes the following steps:

[0054] (1) Graphene oxide is added to deionized water, and ultrasonically dispersed until uniformly mixed to obtain a graphene oxide aqueous solution with a mass concentration of 0.5 mg / ml;

[0055] (2) The mass ratio of carbon nanotubes and graphene oxide in step (1) is 5: 1, carbon nanotubes are added in the graphene oxide aqueous solution that step (1) makes, and ultrasonic dispersion is until mixed evenly, Prepare a mixed solution of graphene oxide and carbon nanotubes;

[0056] (3) freeze-drying the mixed solution of graphene oxide and carbon nanotubes prepared in step (2) to obtain graphene oxide-carbon nanotube airgel;

[0057] (4) After the graphene oxide-carbon nanotube aerogel prepared in step (3) is mixed with magnesium powder, place it in a reactor for magnesia thermal reaction, and after the reaction finishes, soak the reaction product in an a...

Embodiment 3

[0066] The preparation of graphene-carbon nanotube airgel in this embodiment specifically includes the following steps:

[0067] (1) Graphene oxide is added to deionized water, and ultrasonically dispersed until uniformly mixed to obtain a graphene oxide aqueous solution with a mass concentration of 8 mg / ml;

[0068] (2) The mass ratio of carbon nanotubes and graphene oxide in step (1) is 5: 1, carbon nanotubes are added in the graphene oxide aqueous solution that step (1) makes, and ultrasonic dispersion is until mixed evenly, Prepare the mixed solution of graphene oxide and carbon nanotubes:

[0069] (3) supercritically drying the mixed solution of graphene oxide and carbon nanotubes prepared in step (2) to obtain graphene oxide-carbon nanotube airgel;

[0070] (4) After the graphene oxide-carbon nanotube aerogel prepared in step (3) is mixed with magnesium powder, place it in a reactor for magnesia thermal reaction, and after the reaction finishes, soak the reaction produc...

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Abstract

The invention relates to a preparation method of graphene aerogel and graphene-carbon nanotube aerogel. According to the method, graphene oxide or a mixture of graphene oxide and carbon nanotube is subjected to drying treatment; graphene oxide is reduced through a magnesium thermal reaction; the material is soaked in an acidic water solution; and impurities are removed, and the material is dried, such that graphene aerogel or graphene-carbon nanotube aerogel is obtained. Compared with prior arts, the method provided by the invention has the advantages of simple process, and is green and environment-friendly. Magnesium powder is adopted as a reducing agent. Compared to reducing agents such as hydrazine hydrate, sodium borohydride, formaldehyde, carbohydrate compounds, ascorbic acid and hydroiodic acid, magnesium powder has higher reducibility, such that the graphene aerogel or graphene-carbon nanotube aerogel with high carbon-oxygen ratio can be prepared. The electrical conductivity of the graphene aerogel or graphene-carbon nanotube aerogel can reach 10<4>s / cm. The graphene aerogel or graphene-carbon nanotube aerogel has large specific surface area, and is non-toxic and harmless. The graphene aerogel or graphene-carbon nanotube aerogel can be widely applied.

Description

technical field [0001] The invention belongs to the technical field of airgel, and relates to a preparation method of graphene airgel and graphene-carbon nanotube airgel. Background technique [0002] Aerogels are porous nanomaterials with high specific surface area and low density. It is generally obtained by supercritical drying or low-temperature freeze-drying of wet gels. Initially, carbon aerogels are made of resorcinol and formaldehyde as raw materials. After forming gels under alkaline conditions, the aerogels are obtained by supercritical drying and then carbonized. As a new type of mesoporous and microporous structure material, carbon airgel has a porosity of 80% to 99.8% and a specific surface area of ​​200 to 1500m 2 / g. Carbon airgel has a wide range of applications in many fields, such as catalysts and catalyst carriers, gas filter materials, high-efficiency heat insulation materials, etc., and can also be used as electrode materials. And when the carbon aer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B31/02
Inventor 唐煌包志豪
Owner TONGJI UNIV
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