原位硫化法制备Ni_(9)S_(8)/MnS_(2)复合材料及其赝电容性能研究

Preparation of Ni_(9)S_(8)/MnS_(2) composite by in-situ vulcanization and study on its pseudo-capacitance properties

采用两步水热法并通过原位硫化制备了三维Ni_(9)S_(8)/MnS_(2)复合物超级电容器正极材料,由于硫化物的高导电性和双金属硫化物协同作用提供丰富的活性位点,Ni_(9)S_(8)/MnS_(2)复合材料表现出较高的比容量,在10 A/g时循环3000圈后电容保持率为73.1%。以活性炭为负极组装成混合超级电容器,在功率密度为850.1 W/kg时其能量密度达到48.8 Wh/kg。5种颜色的商用LED小灯泡都可以被此器件成功点亮,表明所制备的Ni_(9)S_(8)/MnS_(2)复合材料具有良好的实际应用潜能。

Nickel-manganese(Ni-Mn)precursor is grown on nickel foam(NF)substrate through hydrothermal method.Then,NF with Ni-Mn precursor is used as the template and added into thiourea(TU)solution for secondary hydrothermal.Finally,three-dimensional Ni_(9)S_(8)/MnS_(2) composite is prepared by in-situ vulcanization and applied to the positive electrode of the supercapacitor.After 3000 cycles at 10 A·g^(-1),the capacitance retention of the composite is 73.1%.A hybrid supercapacitor is assembled with activated carbon as negative electrode and with the composite as positive electrode,its energy density reaches 48.8 Wh·kg^(-1) when the power density is 850.1 W·kg^(-1).As expected,five kinds of commercial LED bulbs can be successfully lit by this hybrid supercapacitor,indicating that the prepared Ni_(9)S_(8)/MnS_(2) composite has good practical application potential.