Fig. 8.

Structural characterization and electrochemical performance analysis of MXene (N-doped Ti₃C₂T_x) as a supercapacitor electrode: SEM images of a Parent MAX phase Ti₃AlC₂. b Ti₃C₂T_x obtained after etching the MAX phase with HF. c N-doped Ti₃C₂Tx synthesized at 200 °C (N–Ti₃C₂T_x-200 °C). d N–Ti₃C₂T_x-300 °C. e N–Ti₃C₂T_x-500 °C. f N–Ti₃C₂T_x-700 °C. g XRD spectra stack of the parent MAX phase (Ti₃AlC₂) and the non-doped and various N-doped Ti₃C₂T_x MXenes. h–k XPS spectra of N–Ti₃C₂T_x-200 °C, N–Ti₃C₂T_x-300 °C, N–Ti₃C₂T_x-500 °C, N–Ti₃C₂T_x-700 °C samples, respectively. l CV curves of the non-doped and doped MXenes in 1 M H₂SO₄ at 1 mV s⁻¹ scan rate. m Specific capacitance of the MXenes corresponding to the scan rates in i and n CV curves of the non-doped and doped MXenes in 1 M MgSO₄ at 1 mV s⁻¹ scan rate. o Specific capacitance of the MXenes corresponding to the scan rates in n [150]. Copyright 2018 Elsevier