Design of Polypyrrole‐Induced Nickel Disulfide ( <scp> NiS ₂ </scp> ) Based Positive Electrode for Asymmetric Supercapacitor Applications

ABSTRACT Polypyrrole composited NiS 2 composite was easily synthesized using a hydrothermal and chemical polymerization technique. Two distinct composites (NS@P1 and NS@P3) were created by varying the polymer precursors stoichiometric ratio. The NS@P3 electrode exhibits a high surface area of 68 m 2 g 1 compared to other NS (46.4 m 2 g −1 ) and NS@P1 (59.3 m 2 g −1 ). The polypyrrole composited electrode exhibits excellent performance in electrochemical behavior. The NS@P3 electrode gives a huge specific capacitance of 1356 Fg −1 at 0.5 Ag −1 compared to other electrode of NS (452 g −1 ) and NS@P1 (874 g −1 ). The NS@P3 electrode's capacitive and diffusive mechanism were analyzed by using the Trasatti method. The assembled ASC‐NS@P3//AC exhibits a high energy density of 68 Wh/kg and a power density of 646 W/kg. The prospective utilization of the NS@P3 composite as energy storage electrode materials for supercapacitor applications is confirmed by the enormous specific capacitance, energy and power delivered by the built ASC device.