Study the effect of rGO on the porous binary Zn0.25Cu0.75S nanocomposite deposited on Ni-foam electrode for high performance energy storage devices

Abstract

Supercapattery is the combination of battery and supercapacitor, which has the benefits of both devices like high power density, cycle stability, and greater energy density. Using a simple hydrothermal method, we synthesized zinc sulfide (ZnS), copper sulfide (CuS), and zinc copper sulfide (ZnCuS). The Zn0.25Cu0.75S@rGO nanocomposite electrode exhibited excellent electrochemical results, functioning at 1.4 A/g in a three-electrode assembly with an extraordinary specific capacitance of 2935 F/g. Brunauer-Emmett-Teller (BET) measurements and electrochemical impedance spectroscopy (EIS) studies show the improvement in surface area and electrochemical properties of the material. The hybrid device (Zn0.25Cu0.75S@rGO//AC) showed an extraordinary specific capacity of 150 C/g at 1.2 A/g with Pb of 2800 W/kg and Ed of 36.6 Wh/Kg. The supercapattery device exhibited an outstanding cyclic stability of 91 %. Our findings show that Zn0.25Cu0.75S@rGO is more suitable for storage devices as an electrode material.