▎ 摘　　要

NOVELTY - Preparation of three-dimensional graphene/cobalt oxide composite material, involves adding graphene oxide to dispersant, adding divalent cobalt salt with hydrolyzing accelerant, adding graphene oxide and performing ultrasonic dispersion to obtain graphene oxide/cobalt hydroxide mixture, obtaining dispersion liquid of oxidation graphene, taking resulting mixture into stainless steel autoclave to obtain graphene/cobalt oxide hydrogel, soaking the resulting graphene/cobalt oxide hydrogel with deionized water to obtain the third dimensional graphene/cobalt oxide composite material. USE - Preparation of three-dimensional graphene/cobalt oxide composite material (claimed). ADVANTAGE - The resulting graphene/cobalt oxide hydrogel is pre-frozen, and freeze-dried at 748 F/g. The preparation method is featured with good rate capability, simple and reliable preparation process, low cost and environmentally-friendly. DETAILED DESCRIPTION - Preparation of three-dimensional graphene/cobalt oxide composite material involves adding graphene oxide to the dispersant and performing ultrasonic dispersion, adding the divalent cobalt salt with hydrolyzing accelerant for ultrasonic dispersion to obtain a dispersion of divalent cobalt salt, mixing the resulting graphene oxide dispersion and the resulting divalent cobalt salts dispersion and subjecting to ultrasonic dispersion, controlling the temperature of the oil bath at 60-80 degrees C for 3-6 hours, washing the resulting filter cake with deionized water until the pH of the effluent reaches to 7, adding graphene oxide and performing ultrasonic dispersion to obtain graphene oxide/cobalt hydroxide mixture, obtaining the dispersion liquid of the oxidation graphene, taking the resulting graphene oxide/cobalt hydroxide mixture into Teflon (RTM: PTFE) liner stainless steel autoclave and controlling the water temperature at 160-180 degrees C for 12-18 hours to obtain graphene/cobalt oxide hydrogel, soaking the resulting graphene/cobalt oxide hydrogel with deionized water until the effluent pH reaches to 7, controlling the temperature at -10 degrees C-0 degrees C for freezing for 3-6 hours, and again controlling the temperature at (-60 degrees C)-(-50 degrees C) for freeze-drying for 35-48 hours so as to obtain the third dimensional graphene/cobalt oxide composite material. The dispersing agent is ethanol or deionized water. The dosage ratio of graphene oxide and dispersing agent is 1 mg:1-4 ml. The divalent cobalt salt is cobalt nitrate or cobalt acetate. The concentration of hydrolysis promoter in the urea aqueous solution is 10 mg/L. The mass ratio of divalent cobalt salt and hydrolysis promoting agent is 1:(1-2). The rotating speed of the obtained mixed liquid is controlled at 6000-8000 rpm. The mass ratio of obtained divalent cobalt salt and dispersed divalent cobalt salt is 1:(10-30). The mass ratio of obtained divalent cobalt salt and the dispersed divalent cobalt salt is 1:(60-100). An INDEPENDENT CLAIM is included for application of three-dimensional graphene/cobalt oxide composite material.