▎ 摘　　要

NOVELTY - Preparation of graphene composite sponge involves preparing experimental materials and instruments, washing discarded cigarette ends, drying, immersing in a graphene oxide solution, drying, heating in a tube furnace at 900 degrees C at rate of 5 degrees C/minute for two hours, washing and drying natural cotton, mixing with urea solution in a mold, freeze-drying to obtain cotton-urea block, heating the block at 600 degrees C at rate of 1 degrees C/minute in a tube furnace for 1 hour, increasing the temperature to 900 degrees C, cooling to room temperature to obtain nitrogen doped graphene-carbon fiber composite sponge, mixing graphene oxide and graphene oxide nanoribbons in mass ratio of 1:1 with deionized water, adding the solution to a beaker, freezing for more than 24 hours, vacuum freeze-drying for 48 hours, removing the composite sponge from the mold, and reducing in hydrazine hydrate steam at 90 degrees C for 24 hours to obtain a graphene-graphene nanoribbon composite sponge, and comparing the preparing composite sponges. USE - Preparation of graphene composite sponge. ADVANTAGE - The graphene composite sponge having excellent strength can be produced.