Figure 1. Small-signal impedance of Au electrodes in 100 mM aqueous KCl solution.

The electrode area was varied between 2 mm², 6.5 mm² and 10.5 mm². (a) Impedance as a function of frequency between 1 Hz and 1 MHz. The inset shows the corresponding phase angle. (b) Extracted equivalent parallel capacitance, C_p. (c) Extracted dielectric loss, G_p/ω. The peak in the dielectric loss corresponds to the Maxwell-Wagner relaxation frequency. The solid lines are fits derived by fitting the impedance using Eqs [3 and 4]. The equivalent circuit is presented in the inset of Fig. 2a.