CORE SHELL METAL SULFIDE COMPOSITE DECORATED WITH MNO2ON ZNO NANORODS AS AN EFFICIENT MATERIAL FOR SUPERCAPACITOR

Attention has been paid to the fabrication of Core shell metal sulfide composite materials with MnO2 on nickel foamfor high-performance supercapacitors. We have prepared unique hetero-structures on nickel foam, which was accomplished through a facile and cost-effective chemical bath deposition method, hydrothermal method, combined with dip coating process and drop casting. Metal sulfides have enticed substantial attention owing to their outstanding properties and used in multiple application areas, such as electrochemical energy conversion and energy storage.Here we describe a cost-effective and facile solution approach for the preparation of metal sulfide (CuS) grown on ZnO NRs as a good electrical conductor and facilitating the polymer shell to grow on them. A maximum specific capacitance of 2554.61 and 2040.73 F g-1 are measured for ZnONRs@CuS@PEDOT: PSS@MnO2 and ZnONRs@CuS@PEDOT: PSS, respectively at 0.71 A g-1, whereas the pure ZnO and ZnO@CuS exhibits a specific capacitance of 24.77 and 1709.34 F g-1. After 3000 cycles at a high current density of 1.2 A g−1, the retention rate is 94%, indicating good long-term cycling stability. These results indicate that the ZnO NRs@CuS@PEDOT:PSS@MnO2 electrode has large electrode/electrolyte interface, which offers more active sites and ensures a high charge storage capacity, which is a promising for high-performance supercapacitor applications