▎ 摘　　要

NOVELTY - Preparation of graphene-carbon nanotube composite material comprises mixing graphite oxide and carbon nanotube at mass ratio of 1:0.005-0.5, adding water, ultrasonic treating for 1-5 hours to obtain dispersion, adding nitric acid, ultrasonic treating at 20-50 degrees C for 0.5-2 hours, filtering, collecting filter cake, drying, placing dried solid powder in furnace at 800-1200 degrees C, heat treating for 1-5 hours, cooling, washing with water, filtering, and drying. USE - Method for preparing graphene-carbon nanotube composite material used as electrode material for electrochemical capacitor.