A kinetic interpretation of a negative time constant in impedance equivalent circuits for the dissolution/passive transition

6533b831fe1ef96bd1298ca1

RESEARCH PRODUCT

A kinetic interpretation of a negative time constant in impedance equivalent circuits for the dissolution/passive transition

Francisco Vicente José Juan García-jareño Joan Gregori Michel Keddam

subject

Chemistry General Chemical Engineering Negative resistance Electrode Inorganic chemistry Electrochemistry Time constant Equivalent circuit Thermodynamics Kinetic energy Electrical impedance Dissolution Dielectric spectroscopy

description

Abstract A theoretical impedance function is proposed for the active/passive transition of nickel in an acid sulphate medium. It is considered that passivating species progressively covers the electrode surface. This approximated model predicts the appearance of negative time constants in the impedance spectra when coverage coefficient θ values for passive species are greater than 0.5.

year	journal	country	edition	language
2007-11-01	Electrochimica Acta

https://doi.org/10.1016/j.electacta.2007.06.042

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