▎ 摘　　要

NOVELTY - Improving the performance of manganese(II) molybdate nanoflower/graphene three-dimensional structure and high specific capacitance supercapacitor, comprises taking graphene, manganese nitrate aqueous solution and ammonium molybdate as reaction materials, and distilled water as solvent and ionic liquid trihexyltetradecyl phosphine chloride (I) as structure-directing agent. The pure-phase manganese(II) molybdate nanoflower/graphene composite electrode material is prepared by the ionic liquid structure directing agent-assisted microwave radiation method, placing graphene powder in a 25-250 ml quartz round bottom flask, adding distilled water, stirring to obtain mixed suspension, transferring quartz round bottom flask to atmospheric microwave reactor with reflux device, heating continuously the above mixed suspension, reflux normally during the reaction process to obtain black graphene slurry, naturally cooling, adding analytically pure ammonium molybdate white powder. USE - The method is useful for improving the performance of manganese(II) molybdate nanoflower/graphene three-dimensional structure and high specific capacitance supercapacitor. ADVANTAGE - The manganese(II) molybdate nanoflower/graphene composite electrode material: has excellent composite degree, high crystallinity, regular morphology and excellent electrochemical performance. DETAILED DESCRIPTION - Improving the performance of manganese(II) molybdate nanoflower/graphene three-dimensional structure and high specific capacitance supercapacitor, comprises taking graphene, 50 wt.% manganese nitrate aqueous solution and ammonium molybdate as reaction materials, and distilled water as solvent and ionic liquid trihexyltetradecyl phosphine chloride of formula (I) as structure-directing agent. The pure-phase manganese(II) molybdate nanoflower/graphene composite electrode material is prepared by the ionic liquid structure directing agent-assisted microwave radiation method, (i) taking 0.0010-10.0000 g graphene powder sold by aladdin company, the article number is 12011201, and the specific surface area is 750 m2/g, placing the graphene powder in a 25-250 ml quartz round bottom flask, and then adding 10-100 ml distilled water, and fully stirring for 3-5 minutes to obtain mixed suspension, then transferring the quartz round bottom flask to an atmospheric microwave reactor with reflux device, heating continuously the above mixed suspension at 70-100 degrees C for 1-10 hours, reflux normally during the reaction process to ensure that the reaction volume remains consistent to obtain black graphene slurry, and the model is improved Midea PJ21C-AU, the frequency is 2450 MHz, and the power is 200-1400 W, SEM test shows that the material is 25 nm-thick lamella network interconnection structure, (ii) naturally cooling black graphene slurry obtained in the step (i) to room temperature, adding 5-15 g analytically pure ammonium molybdate white powder to the black graphene slurry, and stirring for 0.5-3 hours to obtain uniform suspension, (iii) adding 10-150 ml distilled water to 5-30 ml 50 wt.% manganese nitrate aqueous solution under strong stirring conditions, and stirring thoroughly for 0.5-1.5 hours and its density of 1.5126 g/ml, then adding 0.0010-10.0000 g structure directing agent of trihexyltetradecyl phosphine chloride, and stirring for 0.5-1.5 hours to obtain uniform solution, (iv) adding the homogeneous solution obtained in step (iii) to the homogeneous suspension obtained in the step (ii), and placing it in a quartz round bottom flask, then transfer to the atmospheric microwave reactor described in step (i), and continuously reacting at 70-100 degrees C for 1-10 hours, (v) naturally cooling product obtained in step (iv) to room temperature, centrifuging in a high-speed centrifuge of 5000-10000 revolutions/minute for 1-3 minutes and washing with distilled water for 3-5 times, drying the washed product in an oven at 50-80 degrees C for 5-20 hours to obtain pure phase manganese(II) molybdate nanoflower/graphene composite electrode material, and the X-ray diffraction, scanning electron microscopy and transmission electron microscopy analysis results of the sample confirmed that it is a pure phase manganese(II) molybdate nanoflower/graphene three-dimensional electrode material for supercapacitors, and has excellent energy storage effect in supercapacitors.