Due to the growing energy problem, effective and reliable energy storage technologies are becoming necessary. Regardless of time, the accessibility of affordable, environmentally friendly energy sources. Batteries and supercapacitors (SCs) are the most important energy storage technologies to be taken into account. While supercapacitors are generating a lot of research attention as a high-performance energy storage device, batteries have several unique characteristics such as increased energy density and stable undeviating discharging at a given voltage. In comparison to other standard capacitors and batteries, supercapacitors exhibit exceptional cycle stability, a high value for specific capacitance, the ability to charge and discharge quickly, and a high energy density. The electrodes used in a supercapacitor’s construction have a big impact on how well it performs. Activated carbon, graphene, carbon nanotubes, conducting polymers, and other metal oxides, metal sulfide are frequently utilized electrode materials in supercapacitors. When selecting an electrode material, considerations including specific capacitance, power density, cyclic stability and cost are generally balanced with the particular needs of the application. Cos-rGO-PPY nanocomposite has outstanding cyclic stability, specific capacitance, and high electrical conductivity, making it a potentially attractive electrode material for a high-performance supercapacitor.