An in-depth investigation of physico-electro chemical properties of NiCo₂S₄ nano composites for high-performance supercapacitor applications

In recent years, spinel-type NiCo₂S₄ has garnered considerable attention as a promising material for supercapacitors due to its high theoretical capacitance and cost-effectiveness, typically synthesised via the hydrothermal method. However, its application as a standalone electrode material is hindered by limited cycling stability. To overcome this challenge and enhance its electrochemical performance, researchers have turned to developing composite materials incorporating NiCo₂S₄. In our pursuit of improving electrode properties for efficient supercapacitors, synthesising composites of NiCo₂S₄ typically involves combining nickel (Ni), cobalt (Co), and sulphur (S) precursors with other materials to form a nanostructured composite. Specifically, we employed this composite in an asymmetric supercapacitor (ASC) with a KOH electrolyte, utilising synthesised graphene oxide as the anode material. The resulting ASC exhibited remarkable performance metrics, boasting a high specific capacity of 1450 Fg^–1 at 0.25 Ag^–1, excellent capacitance retention of 89.03% after 10,000 cycles, and an impressive energy density of 76.47 Wh kg^–1 at 201.01 W kg^–1, alongside outstanding flexibility. Our study highlights the promising potential of porous NiCo₂S₄ composite electrodes in advancing the field of supercapacitors.