▎ 摘　　要

NOVELTY - Electrochemical sodium storage electrode of composite nanomaterial comprises composite nanomaterial of molybdenum disulfide/B-doped graphene, where the composite nanomaterial is prepared by uniformly loading B-doped graphene by molybdenum disulfide layer, the doping amount of B element in B-doped graphene is 3.2-6.6 mol.%, the molybdenum disulfide/B-doped graphene composite nanomaterial has greater electrochemically active specific surface area than molybdenum disulfide/undoped graphene composite, and the molybdenum disulfide layer supported on B-doped graphene has more defects and/or edges, and the electrode comprises 80 wt.% composite nanomaterial with 2/B-doped graphene, 10 wt.% conductive acetylene black, 5 wt.% carboxymethyl cellulose and 5 wt.% polyvinylidene fluoride. USE - As electrochemical sodium storage electrode of composite nanomaterial. ADVANTAGE - The electrode has high reversible specific capacity of electrochemical sodium storage, stable cycle performance and significantly enhanced high-rate charge-discharge characteristics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the nanomaterial, involving (a) ultrasonically dispersing graphene oxide in deionized water to obtain uniform suspension, dripping metered boric acid solution to suspension containing graphene oxide under stirring, continuously stirring for 12 hours, and adding mixed solution containing sodium carbonate and L-cysteine to mixed suspension under stirring, (b) transferring obtained hydrothermal reaction mixture to hydrothermal reaction vessel with PTFE liner, adjusting the volume of hydrothermal reaction mixture system to 80 wt.% nominal volume of hydrothermal reaction vessel with deionized water, controlling the concentration of boric acid in hydrothermal reaction compound system to 0.0125-0.0625 mol/l, after sealing the hydrothermal reaction kettle, reacting at 180 degrees C for 24 hours, naturally cooling to room temperature, centrifuging precipitated product obtained by hydrothermal reaction, separating, completely washing obtained composite nanomaterial of molybdenum disulfide/B-doped graphene after hydrothermal reaction with deionized water and absolute ethanol, (c) taking prepared molybdenum disulfide/B-doped graphene composite nanomaterial as active material of electrochemical sodium storage, uniformly mixing with N-methylpyrrolidone solution of conductive acetylene black, carboxymethyl cellulose and polyvinylidene fluoride to obtain uniform slurry, uniformly applying obtained slurry to copper foil as current collector, performing vacuum drying at 120 degrees C for 12 hours, and rolling to obtain the composite nanomaterial.