▎ 摘　　要

NOVELTY - Composite nanomaterial electrocatalyst with highly efficient hydrogen evolution reaction comprises molybdenum sulfide layer and boron-doped graphene, where the doping amount of boron element in boron -doped graphene is 3.2-6.6 mol.%, which molybdenum sulfide and molybdenum sulfide /undoped graphene composite nanomaterials, molybdenum sulfide /boron-doped graphene composite nanomaterials have a larger electrochemically active specific surface area, and the molybdenum sulfide layer supported on boron -doped graphene with more defects and/or edges. USE - Used as composite nanomaterial electrocatalyst with highly efficient hydrogen evolution reaction. ADVANTAGE - The method is efficient and economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite nanomaterial electrocatalyst for efficient hydrogen evolution reaction comprises (1) ultrasonically dispersing graphene oxide in deionized water to obtain a uniform suspension and then adding the measured boric acid solution to the suspension containing graphene oxide under stirring and continue to stirring for 12 hours, sodium molybdate dihydrate the mixed solution with L-cysteine is added to the above mixed suspension with stirring, (2) transferring the hydrothermal reaction mixture to a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and adjusting the volume of the hydrothermal reaction mixture system to the hydrothermal reaction kettle with deionized water 80% of the nominal volume of the liner, the concentration of boric acid in the hydrothermal reaction mixture system is controlled at 0.0125-0.0625 mol/l, (3) after sealing the hydrothermal reactor, reacting at 180 degrees C for 24 hours, naturally cooling to room temperature, centrifuging the precipitated product obtained by the hydrothermal reaction, washing thoroughly with deionized water and absolute ethanol, after freeze drying for 48 hours.