Exploration of Optical, Structural, and Electrochemical Properties of MnO₂/Mn₂O₃ Nanocomposite as Anode Material for Energy Storage Applications

This article reports the synthesis of MnO 2 /Mn 2 O 3 nanocomposite, which can be used in forming the anode for supercapacitor applications. The MnO 2 /Mn 2 O 3 nanocomposites are synthesized via the sol–gel route and are characterized in context of structural parameters by X‐ray diffraction technique, field emission‐scanning electron microscopy (FE‐SEM), and supercapacitive behavior by cyclic voltammetry (CV) , galvanostatic charging and discharging (GCD), and electrochemical impedance spectroscopy. The spinel structure of MnO 2 /Mn 2 O 3 nanocomposite with space groups Ia3 and I4/m for Mn 2 O 3 and MnO 2 nanocomposite is confirmed by the Rietveld refinement, respectively. The FE‐SEM micrographs reveal the nanosphere‐type shape of the MnO 2 /Mn 2 O 3 nanocomposite. According to outcomes of electrochemical measurements, the nanocomposite exhibits good capacitive behavior in aqueous electrolyte KOH, demonstrating the highest specific capacitance (763 F g −1 ) at 1 Ag −1 current density from GCD. In CV, it has shown excellent performance with specific capacitance (642.93 F g −1 ) at 10 mV s −1 . Additionally, the prepared nanocomposite‐enhanced electrolyte ion interaction may cause rapid charging and discharging, even at low current densities.