Figure 8: Typical Nyquist plots obtained for the electrodes in 5 mM [Fe(CN)6]4−/ [Fe(CN)6]3− solution (PBS pH 7.0) at a fixed potential of 0.2 V (vs. Ag|AgCl, saturated KCl). The data points are experimental while the solid lines in the spectra represent non-linear squares fits. (di and dii) Represents the circuit used in the fitting of the EIS data for bare GCE and GCE-MWCNT, GCEMWCNT- MO, and MO respectively.