1. Schematic diagram of preparation of Ti₃C₂T_x nanosheets

2. (a-b) TEM images of smaller and larger size Ti₃C₂T_x nanosheets with insets showing corresponding diffraction pattern, and (c) AFM image with its height profile of Ti₃C₂T_x

3. (a-b) Diameter distribution of smaller and larger size Ti₃C₂T_x nanosheets; (c) XRD patterns of Ti₃AlC₂ and Ti₃C₂T_x nanosheets with black line indicating Ti₃AlC₂, red line indicating larger size Ti₃C₂T_x, and blue line indicating smaller size Ti₃C₂T_x; (d) I-V curves of smaller and larger size Ti₃C₂T_x with black line indicating larger size Ti₃C₂T_x and red one indicating smaller size Ti₃C₂T_x

4. (a) CV curves of smaller and larger size Ti₃C₂T_x at 20 mV/s; (b) GCD curves of smaller and larger size Ti₃C₂T_x at 1 A/g; (c) Specific capacity of smaller and larger size Ti₃C₂T_x at different scanning rates; (d) EIS (Nyquist plots) for smaller and larger size Ti₃C₂T_x from 5 mHz to 100 kHz

5. (a-b) CV curves of smaller size Ti₃C₂T_x; (c) GCD curves of smaller size Ti₃C₂T_x; (d) Cyclic stability of smaller size Ti₃C₂T_x