▎ 摘　　要

NOVELTY - Graphene oxide dispersion and aniline dispersion are evenly dispersed, to obtain graphene oxide/aniline mixture. Initiator and inorganic acid are added to graphene oxide/aniline mixture, centrifuged, and washed with deionized water, to obtain crude product of graphene oxide/polyaniline. A divalent cobalt salt and graphene oxide are sequentially added to crude product of graphene oxide/polyaniline, ultrasonically dispersed, reacted, soaked in deionized water, pre-frozen and lyophilized, to obtain three-dimensional graphene/polyaniline/cobalt oxide composite material. USE - Preparation of three-dimensional graphene/polyaniline/cobalt oxide composite material for supercapacitor electrode material (claimed). ADVANTAGE - The method enables preparation of three-dimensional graphene/polyaniline/cobalt oxide composite material having excellent cycle characteristics by simple, economical and environmentally-friendly method. DETAILED DESCRIPTION - Graphene oxide is added to dispersion (d1) and ultrasonically dispersed, to obtain graphene oxide dispersion. The dispersant comprises deionized water or alcohol. The mass ratio of graphene oxide and dispersant is 1 mg:1-6 mL. An aniline monomer is added to dispersant (d2) and ultrasonically dispersed, to obtain aniline dispersion. The dispersant (d2) comprises sodium dodecyl sulfate or sodium lauryl sulfate. The mass ratio of aniline monomer and dispersant (d2) is 30-60 mL:1 mg. Graphene oxide dispersion and aniline dispersion are evenly dispersed, to obtain graphene oxide/aniline mixture. The mass ratio of aniline monomer in aniline dispersion and graphene oxide in graphene oxide dispersion is 1-20 mL:1 mg. Initiator and inorganic acid are added to graphene oxide/aniline mixture, and processed at 0-5 degrees C and 200-400 rpm for 8-12 hours, centrifuged at 6000-8000 rpm, and filter cake is washed with deionized water until pH of effluent is 7 or less, to obtain crude product of graphene oxide/polyaniline. The initiator comprises ammonium persulfate or potassium persulfate. The inorganic acid comprises concentrated sulfuric acid or hydrochloric acid. The mass ratio of graphene oxide/aniline mixture and initiator and inorganic acid mixture is 1 mL:2-3 mg. The mass ratio of initiator and inorganic acid is 1 mg:2-3 mL. The divalent cobalt salt and graphene oxide are sequentially added to crude product of graphene oxide/polyaniline and ultrasonically dispersed. The obtained mixture is placed in Teflon (RTM: polytetrafluoroethylene)-lined stainless steel hydrothermal reactor and reacted at 160-180 degrees C for 12-18 hours, to obtain graphene/polyaniline/cobalt oxide hydrogel. The divalent cobalt salt comprises cobalt nitrate or cobalt acetate. The mass ratio of crude product of graphene oxide/polyaniline and mixture containing divalent cobalt salt and graphene oxide is 1 mL:2-6 mg. The mass ratio of graphene oxide and divalent cobalt salt is 15-150:1. The graphene/polyaniline/cobalt oxide hydrogel is soaked in deionized water such that the effluent has pH of 7 or less, pre-frozen at -10 degrees C to -0 degrees C for 3-6 hours and lyophilized at -60 degrees C to -50 degrees C, to obtain three-dimensional graphene/polyaniline/cobalt oxide composite material.