Table 6 Optimal coefficients (A0), Vogel temperature (T0),the logarithm of pre-exponential factor (lnA0), VTF activation energy (E0), R-square (R2) and standard deviation (σ) for the logarithm of charge transfer resistance (lnRct) versus absolute temperature in VTF model (Eqs. 26 and 27) for different acids.
Acid | Values of parameters | R-square | SD | |||||
|---|---|---|---|---|---|---|---|---|
lnA0 | B0 | T0 | T0 | E0 | A0 | R2 | σ | |
– | K | K | °C | kJ mol−1 | Ω cm2 | – | ||
HCl | 1.294262 | 492.059 | 229.45 | − 43.70 | 4.0912 | 3.6483 | 0.999906 | 0.00034 |
H2SO4 | − 6.26592 | 1695.4 | 187.80 | − 85.35 | 14.096 | 0.00190 | 0.999978 | 0.00065 |
H3PO4 | − 15.9299 | 4221.1 | 132.50 | − 140.65 | 35.096 | 1.2071 × 10–7 | 0.997386 | 0.00097 |
