Controllable MnCo2S4 Nanostructure for high performance hybrid supercapacitor
Sulphospinel materials, such as MnCo2S4, are being widely investigated as a promising class of candidates for energy storage. The low electric conductivity and low surface area derived by the conventional processes have however limited the wide usage as a class of the low-cost materials for energy storage. In this work, sulphospinel MnCo2S4 nanostructures have been rationally synthesised through a carefully controlled sulphorization process, which expresses a desirable mesoporous feature with high electrical conductivity. They show much better electrical conductivity and pronounced improvement in the electrochemical performance with high capacitance (938 F g−1 at 20 A g−1) and excellent cycling stability being observed, where the specific capacitance could be retained 95% of its original value after 5000 charge-discharge cycles. To further demonstrate the great potential of the sulphospinel materials, a full-type supercapacitor was assembled with MnCo2S4 on carbon cloth as the positive electrode and a (Porous Carbon Polyhedron) PCP/rGO hydrogel as the negative electrode. The full cell shows a high energy density of 43 Wh/kg at the power density of 0.801 kW/kg, and 16.2 Wh/kg can be remained at a power density of 26.5 kW/kg. Excellent cycling stability is also achieved with 87% retention after 10000 charge-discharge cycles, demonstrating a great potential for the next-generation high performance supercapacitors.