Fig. 5: Three-electrode electrochemical measurement configuration.

a Schematic of an electrochemical cell with Ag/Ag⁺ as the reference electrode (RE) and platinum coil as the counter electrode (CE). The working electrode (WE) was prepared by 20 cycles of dip-coating a PbS QD assembly onto an FTO substrate. A solution of 2 M [EMIM][TFSI] in ethyl acetate was used as the nonaqueous electrolyte. b Bode phase (\(\theta - f\)) plot of the PbS QDs and substrate (FTO) obtained from electrochemical impedance spectroscopy (EIS) measurements. c I-V curve of CV measurements taken at scan rates of 50 and 500 mV/s, and d calculated areal capacitance derived from CV measurements.