Exploring the redox characteristics of porous ZnCoS@rGO grown on nickel foam as a high-performance electrode for energy storage applications.

A supercapattery is a device that combines the properties of batteries and supercapacitors, such as power density and energy density. A binary composite (zinc cobalt sulfide) and rGO are synthesized using a simple hydrothermal method and modified Hummers' method. A notable specific capacity ( C s ) of 1254 C g -1 is obtained in the ZnCoS@rGO case, which is higher than individual C s of ZnS (975 C g -1 ) and CoS (400 C g -1 ). For the asymmetric (ASC) device (ZnCoS@rGO//PANI@AC), the PANI-doped activated carbon and ZnCoS@rGO are used as the cathode and anode respectively. A high C m of 141 C g -1 is achieved at 1.4 A g -1 . The ASC is exhibited an extraordinary energy density of 45 W h kg -1 with a power density 5000 W kg -1 at 1.4 A g -1 . To check the stability of the device, the ASC device is measured for 2000 charging/discharging cycles. The device showed improved coulombic efficiency of 94%. These findings confirmed that the two-dimensional materials provide the opportunities to design battery and supercapacitor hybrid devices.