Solvothermal synthesis of Ti₃C₂T_x/WO_3−x flexible and self-standing films for aqueous proton supercapacitor electrodes

The severe self-restacking of MXene film restricts its development for supercapacitors. Herein, the synthesis of Ti₃C₂T_x decorated with WO_3−x hybrid nanostructures by a one-step solvothermal method was reported in this work, which exhibits enhanced electrochemical performance due to the increased interlayer spacing and synergistic effects. As a result, the optimal Ti₃C₂T_x/WO_3−x nanocomposite electrode shows excellent gravimetric capacitance of 442.0 F g⁻¹ at 2 mV s⁻¹, excellent rate capability, and good flexibility. Moreover, the cycling stability retains at 91.21% after 10,000 cycles (at 10 A g⁻¹). This work provides a new strategy for the development of MXene-based flexible film electrodes with high electrochemical performance.