Synergistic Effect of rGO, α-Fe2O3 and TiO2 in Ternary Nanocomposites for High-Performance Supercapacitor Electrodes

Abstract

Using a straightforward ex-situ technique, a new ternary nanocomposite consisting of reduced graphene oxide (rGO), α-FeO₃, and TiO₂ was created and tested as a high-performance supercapacitor electrode. Crystalline α-FeO₃ and TiO₂ phases integrated into the rGO matrix were verified by XRD. Strong interfacial contacts between the components were confirmed by FTIR, whereas SEM-EDX examination showed evenly distributed nanoparticles on rGO sheets. Excellent performance was shown by electrochemical examination using galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The RFT2 electrode demonstrated excellent charge-discharge behavior, high coulombic efficiency, and a high specific capacitance of 646.5 F/g at 20 mV/s. Low internal resistance and effective ion diffusion were demonstrated by the EIS data. After 2000 cycles at 1 A/g, long-term cycling testing verified an 87.3 % capacitance retention. This composite is a viable option for advanced energy storage applications because of the synergistic interaction between conductive rGO and pseudocapacitive α-FeO₃ and TiO₂, which is responsible for the improved electrochemical performance.