title: Deviations of capacitive and inductive loops in the electrochemical impedance of a dissolving iron electrode.
abstract: The electrochemical impedance of an iron electrode often shows the capacitive and inductive loops on the complex plane. The capacitive loop originates from the time constant of the charge transfer resistance and the electric double layer capacitance. The inductive loop is explained by Faradaic processes involving the reaction intermediate. In some cases, these loops deviate from a true semicircle. In this paper, the origins and curve-fitting methods for the deviated loops of electrochemical impedance are discussed. The constant phase element (CPE) was used to present the deviation of the capacitive loop instead of electric double layer capacitance. The reaction rate constants, which are a function of the frequency, are proposed for the Faradaic impedance to present the deviated inductive loop.
authors.affiliation: Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Itagaki
authors.forename: Akihiro
authors.initials: A
authors.lastname: Taya
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Noda