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Park, Su-Moon
Electrochemistry Lab
Research Interests
  • Electrochemistry and spectroscopy of conducting polymers
  • Environmental Electrochemistry
  • Electrochemical energy conversion devices

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Unified Model for Transient Faradaic Impedance Spectroscopy: Theory and Prediction

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dc.contributor.author Huang, Qiu-An ko
dc.contributor.author Park, Su-Moon ko
dc.date.available 2014-04-10T01:13:15Z -
dc.date.created 2013-06-03 ko
dc.date.issued 2012-08 -
dc.identifier.citation JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.32, pp.16939 - 16950 ko
dc.identifier.issn 1932-7447 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/2883 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84865118877 ko
dc.description.abstract We describe a unified model for transient faradaic impedance spectroscopy developed by obtaining a rigorous expression for the current for a potential step to an electrochemical system containing an oxidant and/or a reductant with no assumptions on the reversibility for redox reactions. Effects of electrode reaction kinetic and other parameters such as the exchange rate constant (k(0)), potential step period (t(p)), diffusion coefficient (D), transfer coefficient (alpha), the number of electrons transferred (n), and overpotential (eta) on observed impedance parameters have been evaluated using the model. We obtained both polarization resistances (R-p's) and Warburg impedances (Z(w)'s) to characterize the nature of the charge-transfer reaction by showing the evolution trend in terms of their admittances employing kinetic parameters such as eta, k(0), t(p), a, n, and D. The peak shift and the half-peak width of Warburg admittance voltammograms were also studied as a function of k(0). We finally discuss ranges of step periods, which allow meaningful transient impedance measurements to monitor faradaic processes in real-time by staircase cyclic voltammetric-Fourier transform electrochemical impedance spectroscopy (SCV-FTEIS) experiments, for a given step height. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Charge-transfer reactions ko
dc.subject Electrochemical systems ko
dc.subject Electrode reactions ko
dc.subject Evolution trend ko
dc.subject Exchange rates ko
dc.subject Faradaic impedance spectroscopy ko
dc.subject Faradaic process ko
dc.subject Impedance measurement ko
dc.subject Impedance parameters ko
dc.subject Number of electrons ko
dc.subject Overpotential ko
dc.subject Peak shift ko
dc.subject Polarization resistances ko
dc.subject Potential steps ko
dc.subject Reductants ko
dc.subject Step height ko
dc.subject Transfer coefficient ko
dc.subject Unified model ko
dc.subject Voltammograms ko
dc.title Unified Model for Transient Faradaic Impedance Spectroscopy: Theory and Prediction ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84865118877 ko
dc.identifier.wosid 000307494600017 ko
dc.type.rims ART ko
dc.description.wostc 1 *
dc.description.scopustc 1 *
dc.date.tcdate 2015-02-28 *
dc.date.scptcdate 2014-08-26 *
dc.identifier.doi 10.1021/jp306140w ko
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