Tuning the Intercalation Redox Mechanism in 2D Ti3C2Tx by Incorporating Cr2O3 Nanoparticles in Aqueous Electrolytes for Supercapacitor Applications

The development of high-energy electrodes for supercapacitors has been thoroughly explored for use in electronics and technological applications. In this research, we synthesized a Ti₃C₂T_x-Cr₂O₃ composite through an etching process followed by a hydrothermal method. Cyclic voltammetry (CV) results showed that the Ti₃ C₂T_x-Cr₂O₃ nanocomposite (NC) achieved a high specific capacity of 315 C/g at a sweep rate of about 10 mV/s. The electrochemical impedance spectroscopy (EIS) study revealed that the Ti₃C₂T_x-Cr₂O₃NC had solution impedance (Rs) and charge transport impedance (R_ct) values of 0.8 Ω and 1.3 Ω, correspondingly. The galvanostatic charge and discharge (GCD) tests confirmed long charge and discharge times and excellent rate capability for the Ti₃C₂T_x-Cr₂O₃NC, with a specific capacity of approximately 622 C/g. Additionally, cyclic stability tests indicated that the Ti₃C₂T_x-Cr₂O₃NC retained 90.6% of its capacitive performance even after 3000 cycles.