▎ 摘　　要

NOVELTY - Preparing graphene composite material involves placing the foamed nickel in the center of the quartz tube furnace and heating from room temperature at a temperature increase rate of 20-40 degrees C / min to a temperature of 1000-1100 degrees C under the protection of argon and hydrogen, and keeping the temperature at 1000-1100 degrees C for 30-60 minutes, and at the temperature of 1000-1100 degrees C. The methane gas is fed into the tube furnace at a rate of 5-10 sccm for 5-20 minutes. The quartz tube furnace is cooled from a temperature of 1000-1100?OC to room temperature at a cooling rate of 80-100?OC /minUTES to obtain foam nickel coated with graphene. The density of the nickel foam is 420-440 g/m2, and the thickness is 1.6-2.0 millimeter. The flow rate of argon gas is 480-500 sccm, and the flow rate of hydrogen gas is 180-200 sccm. USE - Method for preparing graphene composite material. DETAILED DESCRIPTION - Preparing graphene composite material involves placing the foamed nickel in the center of the quartz tube furnace and heating from room temperature at a temperature increase rate of 20-40 degrees C / min to a temperature of 1000-1100 degrees C under the protection of argon and hydrogen, and keeping the temperature at 1000-1100 degrees C for 30-60 minutes, and at the temperature of 1000-1100 degrees C. The methane gas is fed into the tube furnace at a rate of 5-10 sccm for 5-20 minutes. The quartz tube furnace is cooled from a temperature of 1000-1100?OC to room temperature at a cooling rate of 80-100?OC /minUTES to obtain foam nickel coated with graphene. The density of the nickel foam is 420-440 g/m2, and the thickness is 1.6-2.0 millimeter. The flow rate of argon gas is 480-500 sccm, and the flow rate of hydrogen gas is 180-200 sccm. The polymethyl methacrylate is dissolved in ethyl lactate, heated and stirred at 80-120 degrees C for 1-2 hours to get a mixed solution, used 100-200 microlitre per square centimeter a sample gun, added the mixed solution dropwise to the foamed nickel coated with graphene obtained, dried naturally at room temperature, and then kept at 150-200 degrees C for 0.5-1 hours to obtain foam graphene coated with polymethyl methacrylate on the surface. The mass fraction of methyl methacrylate in the mixed solution is 4-5 wt.%. The foamed graphene covered with polymethyl methacrylate obtained is cut into cubes with a surface area of 0.5-2 cm2, and completely immersed in a temperature of 80-90 degrees C, a concentration of 3-4 mole/L hydrochloric acid solution for 4-6 hours to obtain nickel-removed three-dimensional foam graphene. The nickel-removed three-dimensional foamed graphene iss immersed in acetone at a temperature of 60-70 degrees C for 0.5-1.5 hours to obtain polymethyl methacrylate removed foamed graphene, used distilled water to clean the foamed graphene from which polymethyl methacrylate is removed, and then transferred the cleaned foamed graphene from polymethyl methacrylate to clean ITO glass to obtain three-dimensional foamed graphene / ITO glass. The clean ITO glass mentioned is obtained by successively ultrasonic cleaning ITO glass in acetone for 15-20 minutes, ultrasonic cleaning in ethanol for 15-20 minutes and ultrasonic cleaning in deionized water for 15-20 minutes, and naturally dried at room temperature.