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.