Preparation and Electrochemical Properties of 1D/2D MnS/Ni₃S₂ Heterostructures

Transition metal sulfide is an active material with high specific capacitance. MnS/Ni₃S₂ electrode material was hydrothermal prepared on nickel foam by a simple and time-saving method. The effects of hydrothermal reaction time and temperature on the morphology and electrochemical performances of the sample were investigated. The results show that MnS/Ni₃S₂ electrode material has high specific capacitance and excellent magnification performance, and the retention rate of specific capacitance is 90% after 2500 cycles. A hybrid supercapacitor device is assembled with MnS/Ni₃S₂ as the positive electrode and activated carbon (AC) as the negative electrode. MnS/Ni₃S₂//AC can provide 30.2 Wh·kg^–1 energy density when the power density is 700 W·kg^–1. The specific capacitance retention is 116.0% after 3000 cycles. It shows that MnS/Ni₃S₂ is expected to provide potential application value in supercapacitor.