Preparation method of graphene aerogel with high specific surface area and high compression strength

Abstract

The invention discloses a preparation method of graphene aerogel with high specific surface area and high compression strength and belongs to the field of preparation of carbon-based materials, surface functional modification and application. As for the condition that advantages of high electric conductivity, high heat conductivity, high mechanical strength and high specific surface area of single-layer ideal graphene are difficult to play in the application process, the dispersion state of graphite oxide in deionized water is regulated through an aprotic polar solvent dimethylformamide with high dielectric constants, so that graphene aerogel is self-assembled and synthesized from graphite oxide through liquid phase reduction triggered by ascorbic acid in a non-pure water environment. Themethod adopts a simple process, data are accurate, and the prepared graphene aerogel is a black cylinder at the macroscopic level, is of a crosslinked 3D network structure at the microcosmic level, has cascade pore types with the porosity reaching 99.68% and has the lump density of 7.0 mg / cm<3>, the Young modulus of 11.31 kPa and the specific surface area of 701 m<2> g<-1>; the preparation methodis simple, practical and advanced.

Description

technical field [0001] The invention belongs to the technical field of carbon-based material preparation, surface functional modification and application, and in particular relates to a preparation method of graphene airgel with high specific surface area and high compressive strength. Background technique [0002] Ideal graphene possesses excellent electrical conductivity, high Young's modulus, high carrier mobility, and high thermal conductivity. Among the many methods of graphene preparation, chemical oxidation has become a commonly used method in laboratory and industrial production. However, the graphite oxide synthesized by the chemical oxidation method, in the process of generating graphene through the action of the reducing agent, due to sp 2 Restoration of the conjugated region will produce stronger π-π interaction between the sheets, which will lead to an irreversible stacking trend between the graphene sheets, which will curb the excellent physical and chemical p...

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Problems solved by technology

However, the graphite oxide synthesized by the chemical oxidation method, in the process of generating graphene through the action of the reducing agent, due to sp 2 Restoration of the conjugated region will produce stronger π-π interaction between the sheets, which will cause an irreversible stacking tendency between graphene sheets, which will curb the excellent physical and chemical properties of single-layer graphene

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