Fig. 4. (a) Cyclic voltammetry curves of Ti3C2Tx at 0.1 mV s−1 in different electrolyte systems. (b) Capacitive charge storage performances of Ti3C2Tx at different scan rates in 1 M KFSI (DME), 0.8 M KPF6 (EC/DEC) and 1 M KFSI (EC/DEC). (c) Raman spectra of KFSI-DME electrolytes. (d) Raman spectra of electrolyte systems (KFSI and KPF6 in EC/DEC). (e) EIS data in different electrolytes and modeling results of RSEI and Rct for 0 cycles and 20 cycles in different electrolyte systems. SEI layer on the Ti3C2Tx-Co@NCNTs electrode in (f) 1 M KFSI(DME), (g) 0.8 M KPF6 (EC DEC) and (h) 1 M KFSI (EC DEC).
