Enhancing the specific capacitance of LaNiO3 Perovskite oxide by Zn2+ doping in supercapacitor application

Abstract

LaNiO₃ and Zn-doped LaNiO₃ for supercapacitor application are reported here. Chemical precipitation was the method used to prepare the material. By varying doping concentrations, the impact of Zn substitution in LaNiO₃ was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, Brunauer–Emmett–Teller (BET), and electrochemical experiments are used to evaluate the as-prepared nanomaterials. LaNiO₃’s orthorhombic phase formation is confirmed by X-ray diffraction. Surface morphology is analyzed by SEM and porosity was found out from BET characterization. Using different scan intervals and a constant potential window, cyclic voltammetry (CV) was carried out. The charge storage mechanism was analyzed using CV curves and data. Less charge transfer resistance was seen in the apparent Nyquist plot, and the pseudocapacitive characteristic was demonstrated by the oxidation/reduction peak appearances. The prepared electrode material shows a maximum capacitance value of 741.07 F/g and 732.86 F/g by GCD and CV curves respectively. The energy and power density of the prepared electrode was found to be 39.319 Wh/kg and 1.524 kW/kg respectively for 1 A/g current density. The obtained results expose the produced composition of 5 wt% Zn-doped LaNiO₃, a potential material for the electrodes.