Synergetic effect driven LaMnO3@NiO composite based high energy semi-solid supercapacitor

Abstract

Perovskite materials have gained substantial attention in last two decades as electrode materials for energy storage devices due to low cost, good electrochemical stability, mixed ionic-electronic conductivity, long-term stability, and environmentally friendly. We demonstrate the hybridization of lanthanum manganite (LaMnO₃) and Nickel oxide (NiO) composite electrodes for supercapacitor application prepared via sol-gel assisted hydrothermal method. The structural, morphological, surface area, and elemental analysis has been done by X-ray diffraction, Field emission scanning electron microscopy, Brunauer-Emmett-Teller (BET), and X-ray photoelectron spectroscopy (XPS) analysis. The structural, and morphological analysis confirmed the composite formation. The electrochemical properties have been examined by cyclic voltammetry, galvanostatic charge-discharge, and impedance analysis. The resulting LaMnO₃/NiO composite material exhibits enhanced electrochemical performance compared to the individual components. The composite exhibits a specific capacitance of up to 170 F/g at a scan rate of 10 mV/s, which is higher than that of individual LaMnO₃ or NiO materials. The composite also demonstrates desirable cycling stability, with a capacity retention of 76 % after 5000 cycles. These results advocate that the LaMnO₃/NiO composite is a promising material for high-energy supercapacitor applications. Further performance of the nano-composite was evaluated by LED testing. Three symmetric SCs of the composite linked in series were able to glow a green, red, blue LED for about 1 min and a panel of 26 red LED was illuminated for about 12 min. These findings suggested that the obtained composite material is an exceptional electrode with huge potential for potential for supercapacitor application.