Table 1. Extracted impedance parameters by fitting the experimentally measured impedance of Fig. 1 to Eqs [3,4].
| Area S (mm2) | Q (Ω−1 sn) | n | Rct (Ω) | Rct*S (Ωcm2) | Cdl (μF/cm2) | Rsol (Ω) | ρ (Ωcm) |
|---|---|---|---|---|---|---|---|
| 2 | 1.35 × 10−7 | 0.93 | 1 × 108 | 1.35 × 106 | 16.6 | 5.52 × 102 | 1.76 × 102 |
| 6 | 3.45 × 10−7 | 0.95 | 7 × 106 | 2.15 × 105 | 12.0 | 3.30 × 102 | 1.82 × 102 |
| 10.5 | 5.9 × 10−7 | 0.96 | 3.4 × 106 | 1.8 × 105 | 11.6 | 2.98 × 102 | 2.18 × 102 |
The double layer capacitance, Cdl, is calculated using Eq. [5]. The numbers for the surface resistance, Rct*S where S is the area of the electrode, and capacitance per unit area have been corrected for a factor of 2 to account for the two identical electrodes used in the measurements.