▎ 摘　　要

NOVELTY - Forming graphene foam involves pouring water dispersion liquid of the oxidized graphite alkene into the hydro-thermal reaction kettle, sealing cup, adding alkaline solution to adjust pH value to 5.5-11.6, raising the temperature to 150-350 degrees C and keeping temperature, oxidizing the mixed solution into graphite alkene and agglomeration to form graphene wet gel block; freezing on the metal tray, where the metal tray is controlled at -196 to 10 degrees C, completely crystallizing the graphene after wet gel block to form gel crystalline solid; and vacuum sublimation drying the crystalline solid gel. USE - For manufacturing graphene foam (claimed). ADVANTAGE - The method has simple process; and controls the graphene foam hole structure. The prepared graphene foam has good performance, high thermal conductivity, good conductivity, low density, good chemical stability, and high temperature resistance. DETAILED DESCRIPTION - Manufacturing graphene foam involves pouring water dispersion liquid of the oxidized graphite alkene into the hydro-thermal reaction kettle, sealing cup, adding alkaline solution to adjust pH value to 5.5-11.6, raising the temperature to 150-350 degrees C and keeping temperature, oxidizing the mixed solution into graphite alkene and agglomeration to form graphene wet gel block; freezing on the metal tray, where the metal tray is controlled at -196 to 10 degrees C, completely crystallizing the graphene after wet gel block to form gel crystalline solid; vacuum sublimation drying the crystalline solid gel at heating speed of less than 5 degrees C/hour, then subliming and drying by vacuum to obtain the graphene foam; where when the freezing temperature is -10 to -50 degrees C, then the foam structure is parallel to the crystallographic direction of the layered cabbage covering structure, when the freezing temperature is -120 to 196 degrees C, then the foam structure is isotropic dispersivity cell pore structure, when the freezing temperature is -50 to 120 degrees C, then the foam structure presenting layered cabbage covering structure and dispersivity cell structure of a structure, the freezing temperature is from high to low transition, the foam structure is composed of anisotropic layered cabbage covering structure for isotropic dispersivity cell pore structure.