▎ 摘　　要

NOVELTY - Preparing graphene composite sponge involvex using experimental materials and instruments, washing discarded cigarette ends, drying, and immersing in a graphene oxide solution, and then taking out to dry, putting it into a tube furnace and raising to 900 degrees C at a temperature increase rate of 5 degrees C per minute, and heating for two hours and washing and drying the natural cotton, mixing it with the urea solution in the mold, freeze drying to obtain cotton-urea bulk. The block is heated to 600 degrees C at a rate of 1 degrees C per minute in a tube furnace after heating for 1 hour. The temperature is further increased to 900 degrees C at the rate and then heated for 1 hour, and cooled to room temperature to obtain nitrogen doping. Heterographene-carbon fiber composite sponge. The graphene oxide and graphene oxide nanoribbons are mixed in deionized water at a ratio of 1: 1, and configured them accordingly concentration. USE - Method for preparing graphene composite sponge. ADVANTAGE - The method enables to prepare graphene composite sponge that improves the strength of graphene sponge. DETAILED DESCRIPTION - Preparing graphene composite sponge involvex using experimental materials and instruments, washing discarded cigarette ends, drying, and immersing in a graphene oxide solution, and then taking out to dry, putting it into a tube furnace and raising to 900 degrees C at a temperature increase rate of 5 degrees C per minute, and heating for two hours and washing and drying the natural cotton, mixing it with the urea solution in the mold, freeze drying to obtain cotton-urea bulk. The block is heated to 600 degrees C at a rate of 1 degrees C per minute in a tube furnace after heating for 1 hour. The temperature is further increased to 900 degrees C at the rate and then heated for 1 hour, and cooled to room temperature to obtain nitrogen doping. Heterographene-carbon fiber composite sponge. The graphene oxide and graphene oxide nanoribbons are mixed in deionized water at a ratio of 1: 1, and configured them accordingly concentration. The solution is put in a beaker, freezed it in the cold well of a freeze dryer for more than 24 hours, and then vacuum freeze dried it for 48 hours. The graphene oxide-graphene oxide nanoribbon composite sponge is taken out of the mold, and reduced in a hydrazine vapor at 90 degrees C for 24 hours to obtain a graphene-graphene nanoribbon composite sponge. The performance tests include compression performance test, electrochemical performance test, and electromagnetic wave absorption performance test are performed. The compression performance of the composite sponge is tested by the Instron5843 universal stretching machine. The graphene sponge is prepared into a regular cylinder (or a cuboid), and the diameter and height are measured and placed on the platform of the stretching machine for testing. The electrochemical performance test is to use it as a super capacitor electrode, select platinum wire as the counter electrode, calomel electrode as the reference electrode, sponge electrode as the working electrode, and the electrolyte is potassium chloride solution or potassium hydroxide solution. The electromagnetic wave absorption performance is tested with a vector analyzer. The graphene sponge and paraffin are mixed in a mortar, heated at 80 degrees C to melt the paraffin and fill it into the graphene sponge after the paraffin is cooled, the graphene sponge-paraffin compound is put into a self-made mold for compression. The specification test sample can be obtained, and the sample can be tested in the waveguide of the vector analyzer to obtain the corresponding data.