▎ 摘　　要

NOVELTY - Preparing RGO/CNC/CNF composite film comprises (i) mixing graphite, potassium nitrate, potassium permanganate and sulfuric acid in an ice water bath and stirring uniformly, transferring the reactant to a warm water bath to react, adding deionized water to the reaction system, adjusting the water bath temperature, stirring, (ii) taking graphene oxide/cellulose nano fiber mixed suspension in a culture dish to dry, and soaking the dried film in a hydroiodic acid solution, soaking the soaked film in deionizing water to obtain a reduced graphene oxide /cellule nanocrystalline/cellule nano fiber composite film, and (iii) homogenizing in a high pressure homogenizer. USE - The method of RGO/CNC/CNF composite film used in super capacitor film electrode field. and can also be used in energy storage and conversion technology as research hotspot. ADVANTAGE - The composite film obtained by the method has higher specific capacitance and more excellent cycle stability than the pure reduced graphene oxide obtain the same preparation conditions. The graphene oxide/cellulose nano fiber ternary mixture has good compatibility, and can be stably present in the form of a uniform dispersion. At the same time, one-pot method for preparing graphene oxide, not only reduces the use of dangerous chemicals, but also reduces the consumption of energy, meets the sustainable development idea, and after simple drying and reduction, obtaining the reducing graphene oxide nanocrystalline or cellulose nanofiber composite film. The cellulose nano fibre surface is rich in hydroxyl, capable of generating hydrogen bond with the oxygen-containing functional group residual on the surface of the cellulose nano fiber.