Salt Solution Concentration Effects on the Electrochemical Impedance Spectroscopy of Poly(3,4-ethylenedioxythiophene) (PEDOT)
Date
2022-05-09
Authors
Journal Title
Journal ISSN
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Publisher
ChemElectroChem
Abstract
Poly(3,4-ethylenedioxythiophene) (PEDOT) has become a widely used modifier for biomedical electrodes because of its ability to significantly decrease the impedance at low frequencies (below 1 kHz). However, in past studies the role of the solution concentration (ionic conductivity) on the electrochemical impedance behavior has not been well established. Here we describe the electrochemical impedance spectroscopy of the conjugated polymer (PEDOT) using standard screen-printed electrodes and various standard salt (NaCl) solutions with known conductivities from 1.0E-2 S/cm to 3.1E-6 S/cm. Changing the conductivity of the salt solution used for impedance measurements had a dramatic influence on the experimentally obtained spectra. An equivalent circuit consisting of a constant phase element in series with a parallel resistor and second constant phase element was used to match and describe these systems. Our results make it possible to better elucidate the influence of electrode, solution, and polymer coating on the resulting impedance response.
Description
This is the peer reviewed version of the following article: Sitarik, Peter, and David C. Martin. “Salt Solution Concentration Effects on the Electrochemical Impedance Spectroscopy of Poly(3,4‐ethylenedioxythiophene) (PEDOT).” ChemElectroChem 9, no. 11 (2022). https://doi.org/10.1002/celc.202200231, which has been published in final form at https://doi.org/10.1002/celc.202200231. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. This article will be embargoed until 05/09/2023.
Keywords
Electrochemistry, Polymerization, Conducting Materials, Interfaces, Conducting Polymers, Equivalent Circuit Modeling, Impedance Spectroscopy, PEDOT
Citation
Sitarik, Peter, and David C. Martin. “Salt Solution Concentration Effects on the Electrochemical Impedance Spectroscopy of Poly(3,4‐ethylenedioxythiophene) (PEDOT).” ChemElectroChem 9, no. 11 (2022). https://doi.org/10.1002/celc.202200231.