Fabrication of Asymmetric Supercapacitor Device Based on Nickel Hydroxide Electrode-Graphene Assembly

Abstract

Designing the active materials for the growth of the electrode for energy storage application is an important initiative to resolve energy storage-related issues. In this work, flower-like three-dimensional nickel hydroxide F3D-Ni(OH)2 active electrode materials were synthesized through the simple hydrothermal process. The reaction factors such as different amount of nickel nitrate and urea were optimized during the reaction process. The synthesized materials were furthercharacterized in detail by several analytical techniques. The effect of the morphologies on the electrochemical supercapacitive performance was also studied through cyclic voltammetry and charge/discharge (galvanostatic) techniques which shows that the F3D-Ni(OH)2 exhibited specific capacitance of 1240.0 Fg−1 at the current density of 1.0 Ag−1 compared to the other fabricated electrodes. The asymmetric supercapacitor was also assembled using F3D-Ni(OH)2 electrode with graphene (F3D-Ni(OH)2//Gr) which delivered the specific capacitance of 100.0 Fg−1 at the current density of 1.0 Ag−1 and better stability retention up to 93.0% which is due to the porous structure and high surface area originated from the three-dimensional structure. The contained results of the F3D-Ni(OH)2 electrode in half cell assembly and asymmetric supercapacitor suggest that the as-prepared active material could be the potential candidate for the energy storage application.