▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene/nitrogen-doped carbon nanotube/zinc cobalt composite material includes mixing graphene oxide with potassium permanganate, adding hydrochloric acid, stirring, adding hydrogen peroxide, and stirring to obtain porous graphene; subjecting to dialysis with distilled water, ultrasonically dispersing, adding carbon nanotubes, ultrasonically dispersing, and suction-filtering to obtain film; drying, adding aqueous ammonia, and reacting; and adding zinc nitrate, cobalt nitrate, urea, ammonium fluoride, ethanol and distilled water, reacting, and sintering. USE - Method for preparation of nitrogen-doped graphene/nitrogen-doped carbon nanotube/zinc cobalt composite material used as flexible electrode (claimed). ADVANTAGE - The composite material has good flexibility, less change on its electrochemical performance after bending, specific capacitance value as high as 1802 F/g, and improved graphene and carbon nanotube content. DETAILED DESCRIPTION - Preparation of nitrogen-doped graphene/nitrogen-doped carbon nanotube/zinc cobalt composite material comprises: (A) adding 100 mL 0.5 mg/mL graphene oxide with 1.5 g potassium permanganate, stirring for 2 hours, adding 250 mL 36.5% hydrochloric acid, stirring for 3 hours, adding 20 mL 30% hydrogen peroxide, and stirring for 3 hours to obtain porous graphene; (B) placing into dialysis bag, subjecting to dialysis with distilled water for 8-12 days, taking out, ultrasonically dispersing for 1 hour, adding carbon nanotubes at mass ratio of 1:5-15, ultrasonically dispersing for 2 hours, and suction-filtering to obtain film; (C) drying to room temperature for 48 hours, adding 35 mL 25% aqueous ammonia, and reacting to 180 degrees C for 24 hours to obtain nitrogen-doped graphene/carbon nanotube film mixture; (D) adding 0.1 mmol zinc nitrate, 0.1 mmol cobalt nitrate, 0.1 mmol urea, 0.1 mmol ammonium fluoride, 30 mL ethanol and 45 mL distilled water, and reacting to 120-140 degrees C for 4 hours; and (E) transferring into tube furnace, and sintering to 300-400 degrees C for 2 hours under nitrogen atmosphere.