▎ 摘　　要

NOVELTY - The method involves determining the solid carbon source, and selecting the appropriate solvent according to the type of solid carbon source used. One or both of the nickel metal powder and the copper metal powder and the solid carbon source are mixed and placed in the container according to the mass ratio of 10:(0.1-5), and the solvent is added to the mixed powder to prepare precursor suspension. The solvent in the precursor suspension is removed to obtain composite precursor powder, and dried and ground. The composite precursor powder is compressed to obtain a prefabricated block. In a protective atmosphere, an alternating current coil is used to conduct induction heating, and a three-dimensional graphene metal composite material after cooling is obtained. The metal of the three-dimensional graphene metal composite material is removed by using an etchant, followed by purification and dryied to obtain a self-supporting three-dimensional graphene foam. USE - Method for synthesis of self-supporting three-dimensional graphene foam. ADVANTAGE - The method is configured to provide a high-efficiency, controllable preparation method of self-supporting three-dimensional graphene foam with controlled hole and network structure or a composite material. The process flow is simple and fast based on induction heating process, using metal powder as template and catalyst to construct 3D graphene. The operation is simple, easy, and suitable for industrial mass production, and the synthesis time is short (less than 40 seconds). The method is capable of preparing high quality three- dimensional graphene based on the catalytic action of the metal template and ultra-high temperature heating and fast cooling process, and is configured to solve the problem that it is easy to agglomerate and reduce the preparation difficulty of the graphene. The obtained graphene foam composite material has high crystallization degree and less defect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for synthesizing self-supporting three-dimensional graphene composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a graphical view of the Raman spectrum of the self-supporting three-dimensional graphene foam.