The improved electrochemical performance of MnO2 nanorods decorated with polyaniline as efficient electrode towards high-performance supercapacitors

Energy storage is an emergent and enlarging requirement due to its potential need in electronic applications such as power back systems, electronic gadgets, and electrical vehicles. Many materials and their combination have been utilized to get high-performance supercapacitors; likewise, MnO 2 is the most exposed candidate for better electrochemical performance. However, MnO 2 still needs to improve its poor electronic conductivity, posing a challenge in energy storage applications. Here, we addressed the synthesis of MnO 2 Nanorods (MnO 2 NRs) and MnO 2 Nanorods@Polyaniline (MnO 2 NRs@PANI) composite through hydrothermal and in situ polymerization methods. Moreover, as obtained, MnO 2 NRs and MnO 2 NRs@PANI were characterized using XRD, FTIR, and SEM–EDS techniques. Further, the capacitive nature of the prepared MnO 2 NRs and MnO 2 NRs@PANI nanocomposites was analyzed using CV (Cyclic Voltammetry), GCD (Galvanostatic Charge Discharge cycles), Cyclic Stability, and EIS (Electrochemical Impedance Spectroscopy) in 1 M KOH electrolyte solutions. As modified MnO 2 NRs@PANI electrode material exhibited the most significant specific capacitance (C s ) of 1460 F/g at 2 mV/s and magnificent specific capacity (Q) of 980 C/g at 1 A/g, desirable electrochemical stability as capacitance retention is 80% over 4000 CV curves including superior energy density (108.8 Wh/Kg) in contrast to raw material (MnO 2 NRs). These results confirmed that the as-prepared MNO 2 NRs@PANI nanocomposite is an excellent active electrode candidate for efficient supercapacitors with desirable properties.