On a physics-based model of the electrical impedance of ionic polymer metal composites

Youngsu Cha, Matteo Aureli, Maurizio Porfiri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we analyze the chemoelectrical behavior of ionic polymer metal composites (IPMCs) in the small voltage range with a novel hypothesis on the charge dynamics in proximity of the electrodes. Specifically, this paper introduces a so-called composite layer which extends between the polymer membrane and the metal electrode. This homogeneous layer describes the charge distribution at the electrode via two species of charge carriers, that is, electrons and mobile counterions. Charge dynamics is described by adapting the multi-physics formulation based on the Poisson-Nernst-Planck (PNP) equations through the incorporation of the electron transport in the composite layer. Under the hypothesis of small voltage input, we use the linearized PNP model to derive an equivalent IPMC impedance model with lumped elements. The equivalent model is represented as a resistor connected in series with the parallel of a capacitor and a Warburg impedance element. These elements idealize the phenomena of charge build up in the double layer region and the faradaic impedance related to mass transfer, respectively. We validate the equivalent model through measurements on in-house fabricated samples addressing both IPMC step response and impedance.

Original languageEnglish (US)
Title of host publicationASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
Pages97-105
Number of pages9
DOIs
StatePublished - 2012
EventASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012 - Stone Mountain, GA, United States
Duration: Sep 19 2012Sep 21 2012

Publication series

NameASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
Volume2

Other

OtherASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
CountryUnited States
CityStone Mountain, GA
Period9/19/129/21/12

ASJC Scopus subject areas

  • Artificial Intelligence
  • Civil and Structural Engineering
  • Mechanics of Materials

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  • Cite this

    Cha, Y., Aureli, M., & Porfiri, M. (2012). On a physics-based model of the electrical impedance of ionic polymer metal composites. In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012 (pp. 97-105). (ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012; Vol. 2). https://doi.org/10.1115/SMASIS2012-7982