Ultrasonic exfoliated few-layer Ti2CTx nanosheets for high specific capacitive electrode

Two-dimensional metal carbides (MXene) have become promising candidates for fabricating the supercapacitors. Ti₂CT_x is more popular in the MXene family due to its lighter mass and excellent electrochemical properties. In this paper, multilayer Ti₂CT_x is synthesized via choosing the Al layer of etched Ti₂AlC raw material. Under the condition of ultrasonic treatment, the as-prepared electrode based on few-layer Ti₂CT_x nanosheets possess high specific capacitance and strong rate ability. Compared with the etched Ti₂CT_x, the capacitance performance of ultrasonic Ti₂CT_x has been greatly improved, which the specific capacitance changes from the initial 133 F g⁻¹ to 284 F g⁻¹ at the current density of 1 A g⁻¹. In addition, the fabricated electrode remains 91% of the initial capacitance after 1000 cycles of constant current charge and discharge at 1 A g⁻¹. This work demonstrates that the fabricated Ti₂CT_x electrode has excellent capacitive properties and promotes potential use in supercapacitors.