Fig. 3. (a and b) Impedance and (c and d) phase angle as a function of frequency for (a and c) fBLM-AβMs and (b and d) fBLM-AβOs in the PBS (0.01 M phosphate buffer, 0.0027 M KCl and 0.137 M NaCl, pH = 7.4) solution at different potentials. Symbols and lines of the same colors represent experimental data and results of fitting of parameters of the equivalent electrical circuits to the EIS data, respectively, for the same measurement at a single potential. Rs and Rm – solution and membrane resistance, respectively; CPEm and CPEsp – constant-phase element for the membrane and sub membrane (spacer) region, respectively.
