A kind of preparation method of nitrogen-doped carbon microsphere graphene composite airgel

Abstract

A method for preparing nitrogen-doped carbon microsphere graphene composite airgel belongs to the field of carbon material preparation, surface functional modification and application, and can solve the problem that the force in the preparation process of graphene inhibits the application of graphene, Using graphite oxide and polypyrrole spheres with high water wettability synthesized at room temperature as raw materials, nitrogen-doped carbon microsphere graphene composite airgel was synthesized by ascorbic acid-induced liquid phase reduction self-assembly and high-temperature annealing. This method has advanced technology and accurate and detailed data. The synthesized graphene composite airgel is black cylindrical, and the nitrogen-doped carbon microspheres and graphene sheets support each other to form a cross-linked three-dimensional network structure; The graphene composite airgel can be compressed to 90% of its original height, and it can also return to the original height. The Young's modulus of the graphene composite airgel is 8.7 kPa, and it has high mechanical compression strength. This method is a simple and easy functional modification method for preparing graphene composite airgel.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, surface functional modification and application, and in particular relates to a preparation method of nitrogen-doped carbon microsphere graphene composite airgel. Background technique [0002] Single-layer graphene has excellent electrical and thermal conductivity, high strength, and high specific surface area. However, during the preparation of graphene, sp 2 Restoration of the conjugated region leads to strong π-π interaction between graphene sheets, coupled with van der Waals forces and hydrogen bonds between graphene sheets, the existence of these forces causes graphene sheets to An irreversible stacking tendency occurs between layers, thus inhibiting the potential of graphene for practical applications. [0003] It is feasible to assemble nitrogen-doped carbon microspheres and graphene into a composite airgel with a three-dimensional porous structure by liquid-phase redu...

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Problems solved by technology

[0002] Single-layer graphene has excellent electrical and thermal conductivity, high strength, and high specific surface area. However, during the preparation of graphene, sp 2 Restoration of the conjugated region leads to strong π-π interaction between graphene sheets, coupled with van der Waals forces and hydrogen bonds between graphene sheets, the existence of these forces causes graphene sheets to An irreversible tendency to stack between layers occurs, thus inhibiting the potential of graphene for practical applications

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