Abstract: In addition to enjoying the benefits brought by the rapid economic development,coal,oil and so on have also brought about a series of environmental problems.The development of renewable resource becomes particularly important in this condition.Supercapacitor,a new type of energy storage device,is widely studied due to its excellent properties.Electrode material,an important part of supercapacitor,will directly affect the performance of the supercapacitor.
In this paper,NiO@Ni₃S₂ and Mn/NiO@Ni₃S₂ electrode materials are successfully prepared on the surface of nickel foam by a two-step hydrothermal method.By electrochemical analysis,we find specific capacitance of the electrode material increased with the addition of a small amount of Mn.In detail,the Mn/NiO@Ni₃S₂ electrode has a specific capacitance of 3.94 F cm^-2,while NiO@Ni₃S₂ is 2.59 F cm^-2 at a current density of 5 m A cm^-2,and the former has a specific capacitance of about the latter 1.5 times.After 1000 cycles,we know specific capacitance retention of Mn/NiO@Ni₃S₂ is 82.1%,which shows the electrode material doped with Mn has good cycling stability.Based on the above analysis,we can confirm Mn/NiO@Ni₃S₂ is more suitable than NiO@Ni₃S₂ for the electrode material of supercapacitor.To some extent,this experiment can also provide a reference for later encounters with similar events that improve the capacitance of the electrode material.