437063.fig.004a
(a)
437063.fig.004b
(b)
437063.fig.004c
(c)
437063.fig.004d
(d)
Figure 4: (a)–(c) Complex-plane plots of impedance spectra ( -sweep) in 0.5 M K2SO4 benzene-saturated solution at potentials : (1) 0.80 V; (2) 1.40 V; (3) 1.60 V; (4) 1.65 V; (5) 1.70 V; (6) 1.75 V; (7) 1.80 V; (8) 1.85 V; (9) 1.90 V; (10) 1.95 V; (11) 2.00 V; (12) 2.05 V; (13) 2.10 V; (14) 2.15 V; (15) 2.20 V; (16) 2.25 V; (17) 2.30 V; (18) 2.35 V; (19) 2.40 V. (d) The Bode plot (bi-logarithmic dependence of the impedance modulus on the frequency).