▎ 摘　　要

NOVELTY - Preparing tetravanadium tricarbide-nickel oxide-reduced graphene oxide heterostructure hydrogel, comprises (a) mixing the powders of aluminum, carbon and vanadium uniformly, heating in a tube furnace in an inert gas or nitrogen atmosphere, annealing, cooling to room temperature, grinding and pulverizing, and etching the powder with acid; (b) adding the product into the mixed solution of nickel salt and urea, and ultrasonically treating to obtain a uniform suspension, heating the suspension, cooling to room temperature naturally, and collecting by centrifugation, rinsing with ethanol and deionized water, freeze-drying, and heating; and (c) ultrasonically dispersing graphene oxide in deionized water for 3-4 hours, and centrifuging to remove impurities to obtain a graphene oxide colloidal suspension, adding the product into graphene oxide colloidal suspension, adding L-ascorbic acid, sealing the hydrothermal reaction, and rinsing with deionized water until the pH value is 7. USE - The tetravanadium tricarbide-nickel oxide-reduced graphene oxide heterostructure hydrogel is useful in preparing electrode and supercapacitor (all claimed). ADVANTAGE - The hydrogel structure has excellent mechanical property, so it does not need agglomerant directly made into electrode material, the prepared super capacitor has excellent electrochemical performance due to synergistic effect of each component and obvious prevention of V4C3TX aggregation.