Enhanced Graphical Representation of Electrochemical Impedance Data

Mark E. Orazem (1) , Nadine Pébère (2) , Bernard Tribollet (3)

1 University of Florida (USA)
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingénierie des matériaux
3 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

Bode plots, corrected for Ohmic resistance, logarithmic plots of the imaginary component of the impedance, and effective capacitance plots are shown to be useful complements to the more traditionally used complex-plane and Bode representations for electrochemical impedance data. The graphical methods are illustrated by synthetic data and by experimental data associated with corrosion in saline environments. Bode plots are shown, in particular, to be confounded by the influence of electrolyte resistance. The plots proposed here provide useful guides to model development for both reactive and blocking systems. The logarithmic plots of the imaginary component of the impedance and effective capacitance plots are useful for all impedance data, and the correction for Ohmic resistance in Bode plots is useful when the solution resistance is not negligible.

Keywords: electrochemistry; electrolytes; capacitance

Domains: Material chemistry

Mark E. Orazem, Nadine Pébère, Bernard Tribollet. Enhanced Graphical Representation of Electrochemical Impedance Data. Journal of The Electrochemical Society, 2006, 153 (4), pp.B129-B136. ⟨10.1149/1.2168377⟩. ⟨hal-03595848⟩