Utilization of spray pyrolyzed porous nickel cobaltite electrode as an advanced material for NiCo2O4@Graphite asymmetric supercapacitor device

Abstract

Nickel-based probe ingredients are vastly promoted in energy storage devices due to their simply variable structure, greater electrochemical movement and nominal noisomeness. In the existing manuscript, we did a comparative study of spray pyrolyzed nickel oxide and nickel cobaltite thin film electrodes and their asymmetric supercapacitor devices for supercapacitor applications. In a three-electrodes arrangement, pristine nickel oxide shows a maximum specific capacitance of 397.10 Fg−1 at 0.002 V scan rate with 86.40 % retention after 5000 cycles. The same electrode shows the values of energy density and power density 45.16 Whkg−1 and 05 Wkg−1 respectively. Nickel cobaltite (NiCo2O4) electrode exhibits the highest value of specific capacitance is 676.82 Fg−1 with 89.23 % retention after 5000 cycles and the values of energy and power densities are 1123.41 Whkg−1 and 5.76 Wkg−1 respectively. The fabricated NiCo2O4@graphite asymmetric device shows a specific capacitance (according to CV analysis) of 495.10 Fg−1. According to the GCD analysis, the NiCo2O4@Graphite device exhibits a specific capacitance of 675.72 Fg−1 and the energy and power densities are 3249.6 Whkg−1 and 10 Wkg−1 respectively. The outcomes show that nickel–cobalt oxide materials play an important role in the field of energy storage.