▎ 摘　　要

NOVELTY - Preparing manganese selenide/reduced graphene oxide nano composite material comprises mixing manganese powder and selenium powder at a molar ratio of 1:1 and compacting, placing compact in anode copper pot in the reaction chamber of the DC arc discharge device, and fixing cathode tungsten rod on copper pot vertically, evacuating reaction chamber and introducing argon gas, passing circulating cooling water through copper pot and the water wall, starting DC arc welding machine, set current parameters, and the reaction is 10-15 minutes, cooling and passivating in an argon atmosphere, collecting yellow-green powder on the top cover and the water wall is manganese selenide nanoparticles, mixing 2 g/l manganese selenide nanoparticle suspension and 0.5 g/l graphene oxide suspension at a volume ratio of 1:0.5-2, passing into a magnetic stirrer and stirring, freeze-drying mixed solution to obtain fluffy brown manganese selenide/graphene oxide. USE - The manganese selenide/reduced graphene oxide nano composite material is useful in super capacitor. ADVANTAGE - The material: has current density of 1 A/g, and mass specific capacitance of 176.6 F/g. DETAILED DESCRIPTION - Preparing manganese selenide/reduced graphene oxide nano composite material comprises mixing manganese powder and selenium powder at a molar ratio of 1:1 and compacting, placing compact in anode copper pot in the reaction chamber of the DC arc discharge device, and fixing cathode tungsten rod on copper pot vertically, evacuating reaction chamber and introducing argon gas, passing circulating cooling water through copper pot and the water wall, starting DC arc welding machine, set current parameters, and the reaction is 10-15 minutes, cooling and passivating in an argon atmosphere, collecting yellow-green powder on the top cover and the water wall is manganese selenide nanoparticles, mixing 2 g/l manganese selenide nanoparticle suspension and 0.5 g/l graphene oxide suspension at a volume ratio of 1:0.5-2, passing into a magnetic stirrer and stirring, freeze-drying mixed solution to obtain fluffy brown manganese selenide/graphene oxide, which is calcined in a 5% ammonium/argon mixed gas atmosphere at 300-500 degrees C for 30-60 minutes, and heating rate is 2 degrees C/minutes to obtain product.