A Precise, Reduced-Parameter Model of Thin Film Electrolyte Impedance

Author(s)McNealy, Benjamin E.
Author(s)Jiang, Jun
Author(s)Hertz, Joshua L.
Ordered AuthorBenjamin E. McNealy, Jun Jiang, and Joshua L. Hertz
UD AuthorMcNealy, Benjamin E.en_US
UD AuthorJiang, Junen_US
UD AuthorHertz, Joshua L.en_US
Date Accessioned2015-12-17T16:06:05Z
Date Available2015-12-17T16:06:05Z
Copyright DateCopyright © The Author(s) 2015.en_US
Publication Date2015-03-07
DescriptionPublisher's PDF.en_US
Abstracthe extreme shape factors inherent in characterizing thin film electrolytes can present a challenge to quantitative interpretation f impedance spectra. Here, the impedance of a thin film ceramic electrolyte with surface microelectrodes is modeled via direct umerical solution of current conservation. Faradaic and non-faradaic currents at the electrode-electrolyte interface are modeled phe- omenologically using a formulation based on the Butler-Volmer equation. The model is able to reproduce complex, experimentally btained impedance spectra for Pt/YSZ and Pt/GDC cells using only four adjustable, physically intuitive parameters: electrolyte onductivity, permittivity, exchange current density, and double layer capacitance. Equivalent circuit models typically used to fit hese spectra instead require six or more adjustable parameters with ambiguous physical meaning. Notably, the model described here s able to capture a heretofore unexplained intermediate frequency arc seen in the experimental results. A parametric study enables he mechanism of the intermediate frequency feature to be identified as a spreading resistance in the electrolyte that vanishes at high requencies due to low-impedance dielectric transport of current across the electrode-electrolyte interface. The fitting results are validated by comparison of the parameter values with literature reports.en_US
DepartmentUniversity of Delaware. Department of Mechanical Engineering.en_US
DepartmentUniversity of Delaware. Department of Materials Science and Engineering.en_US
CitationJ. Electrochem. Soc. 2015 volume 162, issue 6, F537-F546en_US
ISSN0013-4651 ; e-1945-7111en_US
PublisherThe Electrochemical Societyen_US
dc.rightsCC BY, http://creativecommons.org/licenses/by/4.0/en_US
dc.sourceJournal of The Electrochemical Societyen_US
TitleA Precise, Reduced-Parameter Model of Thin Film Electrolyte Impedanceen_US
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