▎ 摘　　要

NOVELTY - Production of a graphene-carbon nanotube composite involves dispersing graphene oxide in a solvent, adding a reducing agent to the graphene oxide dispersion and reducing by heating to obtain reduced graphene, acid treating carbon nanotubes, dispersing the reduced graphene and acid-treated carbon nanotubes in a solvent, and spray-drying. USE - Production of graphene-carbon nanotube composite used for electrode material (all claimed) of energy storage device. Can also be used for water treatment and removal of odor and toxic gases. ADVANTAGE - The method efficiently and economically produces graphene-carbon nanotube composite by simple wet process without high-temperature heat treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the graphene-carbon nanotube composite, which comprises carbon nanotubes inserted between the layers of reduced graphene in the form of a sheet, so that it has a mesopore structure of 2-50 nm and has a density of 0.15 g/cm3 or more.