Molten Salt-Derived Double Transition Metal MXene (Ti2NbC2Tx) as a Capacitive Material for Energy Storage Applications

MXene, a class of two-dimensional material have attracted wide attention as an energy storage material. In this work, a double transition metal MXene Ti₂NbC₂T_x was prepared via molten salt (MS) etching with controlled –Cl and –O terminations. The results demonstrate that the introduction of O-terminated MXene enhances electrochemical performance, resulting in a high Li⁺ storage capacity up to 320 mAh/g and high rate capability 220 mAh/g at 1C rate. These findings highlight double transition metal MXene prepared by MS etching as a promising negative electrode material for energy storage in a nonaqueous electrolyte.