Electrochemical impedance spectroscopic experiments were performed with IviumStat & IviumStat.XR: Electrochemical Interface & Impedance Analyser. The electrodes were characterized in 1.0 mM Fe(CN)63 −/4 − redox couple via EIS methods. EIS data were measured at 100 kHz to 0.1 Hz at 10 mV wave amplitude and at an electrode potential of 0.185 V.