▎ 摘　　要

NOVELTY - The preparation method of porous graphene supported carbon nano-onion three-dimensional composite material involves mixing nickel nitrate and ethanol aqueous solution, adding polymethyl methacrylate particles to nickel nitrate, stirring in water bath and homogenizing to obtain homogeneous colloidal solution, adding copper nanoparticles and ultrafine particles to homogeneous colloidal solution, stirring in water bath to obtain precursor slurry, immersing nickel foam in precursor slurry, and drying. USE - The method is useful for preparing porous graphene supported carbon nano-onion three-dimensional composite material (claimed). ADVANTAGE - The method enables preparation of porous graphene supported carbon nano-onion three-dimensional composite material with excellent porous structure, conductivity and chemical stability. DETAILED DESCRIPTION - The preparation method of porous graphene supported carbon nano-onion three-dimensional composite material involves mixing 0.5-3 mol.ml1 nickel nitrate and 80 wt.% ethanol aqueous solution, adding polymethyl methacrylate particles to nickel nitrate in mass ratio of (5-15):7, stirring in water bath at 70-90 degrees C and homogenizing to obtain homogeneous colloidal solution, adding copper nanoparticles and ultrafine particles in mass ratio of 3:(1-3) to homogeneous colloidal solution, stirring in water bath at 70-90 degrees C to obtain precursor slurry, immersing nickel foam in precursor slurry, maintaining the temperature for 10-30 seconds and drying at 80 degrees C to obtain precursor template sheet, placing precursor template sheet in quartz tube furnace temperature region, subjecting the sheet to high-temperature zone in 10-30 ml.minute-1 methane/100-200 ml.minute-1 hydrogen/300-500 ml.minute-1 argon atmosphere, and quickly cooling sheet to room temperature to obtain prefabricated sheet, soaking prefabricated sheet in ferric chloride-hydrochloric acid corrosive liquid, washing and drying.