▎ 摘　　要

NOVELTY - Preparing graphene-graphene nanobelt comprises e.g. (i) preparing experimental materials and instrument, (ii) using gravimetric method for determining the concentration of graphene oxide and graphene oxide nanoribbon solutions, taking one milliliter of graphene oxide solution and dropping on a weighed glass slide in mg/ml, testing the weight, drying in a oven at 80 degrees C, where the difference between the two is the graphene oxide (or graphene oxide nanoribbon) content per milliliter of graphene oxide (or graphene oxide nanoribbon) solution, (iii) stirring and mixing uniformly according to the mass ratio of graphene oxide- graphene oxide nanoribbon is 1:1, drawing the corresponding volume of solution into the mold, (iv) freezing the graphene oxide-graphene oxide nanoribbon solution in the cold well of a freeze dryer for 24 hours, then evacuating, freeze-drying, ensuring that the sample is completely drying for 48 hours, and(v) removing the freeze-dried sample. USE - The method is useful for preparing graphene-graphene nanobelt. ADVANTAGE - The method improves the strength of the graphene sponge. DETAILED DESCRIPTION - Preparing graphene-graphene nanobelt comprises (i) preparing experimental materials and instrument, (ii) using gravimetric method for determining the concentration of graphene oxide and graphene oxide nanoribbon solutions, taking one milliliter of graphene oxide solution and dropping on a weighed glass slide in mg/ml, testing the weight, drying in a oven at 80 degrees C, where the difference between the two is the graphene oxide (or graphene oxide nanoribbon) content per milliliter of graphene oxide (or graphene oxide nanoribbon) solution, (iii) stirring and mixing uniformly according to the mass ratio of graphene oxide- graphene oxide nanoribbon is 1:1, drawing the corresponding volume of solution into the mold, (iv) freezing the graphene oxide- graphene oxide nanoribbon solution in the cold well of a freeze dryer for 24 hours, then evacuating, freeze-drying, ensuring that the sample is completely drying for 48 hours, (v) removing the freeze-dried sample to obtain graphene oxide- graphene oxide nanoribbon sponge that has not been restored, namely oxidized graphite, graphene oxide nanoribbon composite sponge, (vi) reducing graphene oxide-graphene oxide nanoribbon composite sponge in hydrazine hydrate at 90 degrees C for 24 hours, removing, cooling to room temperature, placing in a vacuum oven at 100 degrees C for 24 hours, removing the residual hydrazine hydrate, cooling to room temperature to obtain graphene-graphene nanoribbon composite sponge (G-GNR).