I have CV data and EIS data from IVIUM software can it possible get Tafel plot from those data
Ahmed Emad Fathy Abbas
Use the CV experiment to determine key parameters like corrosion potential (Ecorr), corrosion current density (icorr) and cathodic/anodic Tafel slopes (ba and bc). The scan rate should be low (e.g. 5 mV/s) for accurate Tafel analysis. From the slow scan rate CV curve near Ecorr (±250 mV vs Ecorr), extract values for icorr based on the cathodic/anodic current intercepts. Use the tangents of the linear regions to estimate ba and bc. Perform EIS at open circuit potential across a suitable frequency range (e.g. 100 kHz to 0.1 Hz). Extract the charge transfer resistance (Rct) value from fitting the resulting Nyquist plot. Use the Stern-Geary equation to calculate icorr from Rct. This will complement the CV method. Plot the polarization curve on a log scale of current density versus potential. Use the Tafel equation and parameters from steps 1-4 to generate the theoretical Tafel fit lines for the cathodic and anodic branches.
Yes, it is possible to construct a Tafel plot using CV and EIS data obtained from an Ivium potentiostat. Here is an outline of the steps:
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