▎ 摘　　要

NOVELTY - Preparation of graphene-carbon nanotube composite material, involves adding dispersant to the mixed powder of graphene and carbon nanotubes and mixing it uniformly, putting into a planetary ball mill for ball milling and washing and drying after ball milling. USE - Preparation of graphene-carbon nanotube composite material in supercapacitor, optoelectronic device and electrochemical sensor. ADVANTAGE - The composite material has excellent dispersion and composite degree.