▎ 摘　　要

NOVELTY - A graphene-based composite comprises: graphene; and a structure former contacting the graphene. The structure former is a metal oxide or a carbon compound and comprises pores in it. The graphene-based composite has a porous particle structure. USE - As a graphene-based composite which is used in a catalyst carrier or an electrode active material (claimed). ADVANTAGE - The graphene-based composite is a spherical particle having an average diameter of 100-10000 nm, a specific surface area of 300-1500 m2/g, and a capacitance of 150-400 F/g. The graphene-based composite capable of maximizing effects of material transfer and heat transfer, which are required when a graphene-based composite is applied to electrodes and catalyst carriers, while maintaining inherent properties of graphene such as conductivity. Particularly the present graphene-based composite, secures both an ion transfer path and an electrical conduction path, have a large specific surface area and a capacitance (charge storage capacity) of greater than or equal to 150 F/g, and prevent a problem of stacking graphene. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparing (p1) a graphene-based composite involving either: preparing a precursor solution by placing and dispersing graphene oxide and a pore agent in a solvent, followed by mixing the precursor solution with a metal oxide precursor, and performing spraying and heat treatment of the precursor solution to form a graphene-based composite; or mixing graphene, a carbon precursor, a metal oxide precursor, a pore agent and a solvent, followed by heat treatment, and removing a metal oxide from the graphene-carbon-metal oxide composite; and (2) a catalyst carrier or an electrode active material comprising the graphene-based composite.