Extrapolation to zero frequency with first time constant of ferri-ferrocyanide/Pt interface using Foster equivalent circuit and factorized modelling
Résumé
An estimation of low frequency parameters at the interface of a ferri-ferrocyanide solution on a Pt rotating disk electrode is presented. The determination of the total resistance and effective (low frequency) capacity is based on a Foster's model extrapolation using electrochemical impedance spectroscopy measurements. The feasibility of the proposed approach has been demonstrated at equilibrium conditions and under two polarization points. Results show a good agreement with the identified and experimental values particularly in the extra-low frequency domain. Results also demonstrate that using factorized expression (poles and zeros) of the impedance allow the stability of the identified parameters and the calculation of the first time-constant of the system. Consequently, Foster's models as equivalent to Voight-type equivalent circuit can be used for the zero frequency extrapolation and predict the response of the interface in time domain that it is certainly useful for practical electrochemical systems.
Domaines
Mécanique des fluides [physics.class-ph] Matériaux et structures en mécanique [physics.class-ph] Milieux fluides et réactifs Energie électrique Thermique [physics.class-ph] Vibrations [physics.class-ph] Physique mathématique [math-ph] Physique Quantique [quant-ph] Acoustique [physics.class-ph] Biomécanique [physics.med-ph] Matériaux Polymères Acoustique [physics.class-ph] Automatique / Robotique Electromagnétisme
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