Advanced electrochemical performance of N-Ti₃C₂/MnO₂ MXene as a promising electrode for energy storage

In this study, we demonstrate a simple and efficient two-step synthetic strategy to design a high-performance N-Ti₃C₂/MnO₂ composite for energy storage application. Nitrogen doping alters the electronic structure of electrode materials and enhances pseudocapacitance. N-Ti₃C₂ serves as a supporting substrate for MnO₂, boosting the active surface area by preventing Ti₃C₂ layer stacking. Benefitting from the collaborative contribution and synergistic interaction within this multicomponent system, N-Ti₃C₂/MnO₂ results in exceptional specific capacitance of 2107.1 Fg⁻¹ at 1 Ag⁻¹. It also exhibits a low internal resistance and maintains a capacitive retention of 94% over 3000 cycles. The asymmetric capacitor also delivers an energy density of 117.1 Whkg⁻¹ at a power density of 1290.1 Wkg⁻¹. This work presents a straightforward method for modifying Ti₃C₂ through nitrogen doping and the insertion of MnO₂ as an interlayer spacer to enhance electrochemical performance.