Electrochemical Performance of TiO₂/Mn₂O₃ Nanocomposite in Different Electrolyte Environments

This study examines the electrochemical performance of the TiO₂/Mn₂O₃ nanocomposite in different electrolyte environments, which is synthesized by the sol–gel method. The confirmation of the as‐prepared composite material is confirmed by X‐ray diffraction (XRD), Fourier transform spectroscopy, Raman spectroscopy, and X‐ray photoelectron spectroscopy. Morphological analysis is carried out using high‐resolution scanning electron microscopy, while high‐resolution transmission electron microscopy reveals the porous morphology, further confirming the successful presence of the nanocomposite. To enhance the electrochemical performance, potassium ferricyanide (K₃[Fe(CN)₆]) is introduced as a redox additive in 2M KOH electrolyte. The TiO₂/Mn₂O₃ electrode exhibits specific capacitances of 338 Fg⁻¹ and 594 Fg⁻¹ at a scan rate of 5 mVs⁻¹ and 144 Fg⁻¹ and 1107 Fg⁻¹ at a current density of 3 Ag⁻¹ in KOH and RAE electrolytes, respectively. Charge–discharge cycles show improved cyclic stability and coulombic efficiency of 72.2% and 98.3% in RAE at 10 Ag⁻¹. The enhanced electrochemical behavior can be attributed to the redox‐active nature of the additive, which promotes faster ion diffusion and improved charge storage kinetics. These findings suggest that the TiO₂/Mn₂O₃ nanocomposite, in conjunction with a redox additive electrolyte, is a promising candidate for high‐performance supercapacitor applications.