Preparation method and application of coconut shell charcoal/three-dimensional graphene composite material

Abstract

The invention provides a preparation method of a coconut shell charcoal / three-dimensional graphene composite material. The preparation method comprises the following steps: S1, pretreating coconut shells to obtain a three-dimensional coconut shell fiber skeleton; S2, carbonizing the three-dimensional coconut fiber skeleton in an inert atmosphere, and then performing broaching and activating treatment to obtain a three-dimensional porous activated carbon fiber skeleton; S3, preparing a graphene oxide dispersion liquid, and adding functional components into the graphene oxide dispersion liquid to obtain a composite solution; S4, reacting the activated carbon fiber skeleton with the composite solution at high temperature and high pressure for 0.5-24 hours, and cleaning and drying after the reaction is finished; and S5, sintering the sample obtained in the step S4 in an inert atmosphere to obtain the coconut shell charcoal / three-dimensional graphene composite material. According to the preparation method of the coconut shell charcoal / three-dimensional graphene composite material, the problem that three-dimensional graphene is easy to crack in the preparation process is solved, and theobtained coconut shell charcoal / three-dimensional graphene composite material has better mechanical properties and electromagnetic wave absorption performance.

Description

【Technical field】 [0001] The invention relates to the field of composite materials, in particular to a preparation method and application of a coconut shell carbon / three-dimensional graphene composite material. 【Background technique】 [0002] Graphene has remarkable characteristics such as high temperature resistance, good flexibility, light weight, wide wave-absorbing frequency band, high thermal conductivity, and porosity. It has been widely used in energy, electronics, electric power, heat conduction, communication and other fields. The application research of graphene is a hot spot nowadays. In the prior art, the use of graphene in electromagnetic wave absorption or stealth structural parts is mainly prepared by blending graphene, wave absorbing agent and matrix resin into wave absorbing composite materials. [0003] Three-dimensional graphene has many advantages of graphene, but its mechanical properties are poor, and the three-dimensional graphene prepared by the prior...

AI Technical Summary

Problems solved by technology

The present invention prepares the three-dimensional porous activated carbon fiber framework in advance, and then reacts the composite solution containing graphene oxide in the three-dimensional porous activated carbon fiber framework, thereby preparing a large-scale coconut shell carbon / three-dimensional graphene composite material, which solves the problem of three-dimensional graphene In the problem of easy cracking in the preparation process, the interface strength between coconut shell carbon and three-dimensional graphene can be further enhanced by high-temperature sintering, so that the coconut shell carbon / three-dimensional graphene composite material in the present invention has better mechanical properties and electromagnetic wave absorption properties.

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