All the electrochemical measurements unless stated otherwise were performed with PalmSens4 potentiostat galvanostat, with an Electrochemical Impedance Spectroscopy (EIS) module, which is controlled with PSTrace software (version 5.8.1704). The threeelectrode electrochemical cell consisted of a platinum wire counter electrode, Ag/AgCl (1M KCl) reference electrode, and ITO working electrodes. The performances of the fabricated electrodes were first studied using cyclic voltammetry (CV) technique with 1,1'-ferrocenedimethanol (FcDM) as the redox probe in potassium nitrate. Parameters for CV were as follows: scan rate 0.01V/s, step potential 0.005 V. Electrodes were cleaned first with ethanol, then with water, and dried before the measurements. Apart from this 3 cycles of a step chronoamperometry was performed to analyse the real electrochemical active area using chronocoulometry, during which the initial potential 0.0 V was held for 10.0 seconds after which the potential stepped to 0.65 V for a time interval of 10.0 seconds.