Figure 6: Electrochemical impedance spectroscopy at (a) -10, (b) 0, (c) 25 and (d) 40 ℃.
According to the standard equivalent circuit model, the measured impedance data were analyzed by using a complex non-linear least squares (CNLS) fitting method (Figure 7). EIS studies the system response to the application of a periodic small amplitude AC signal.5,10 Analysis of the system response contains information about the interface, its structure and reactions taking place at the interfaces e.g., electrolyte-electrodes.20