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Title: A physical interpretation of impedance at conducting polymer/electrolyte junctions

We monitor the process of dedoping in a planar junction between an electrolyte and a conducting polymer using electrochemical impedance spectroscopy performed during moving front measurements. The impedance spectra are consistent with an equivalent circuit of a time varying resistor in parallel with a capacitor. We show that the resistor corresponds to ion transport in the dedoped region of the film, and can be quantitatively described using ion density and drift mobility obtained from the moving front measurements. The capacitor, on the other hand, does not depend on time and is associated with charge separation at the moving front. This work offers a physical description of the impedance of conducting polymer/electrolyte interfaces based on materials parameters.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Bioelectronics, Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC 880 route de Mimet, 13541 Gardanne (France)
  2. Department of Materials Engineering, Monash University, Clayton, VIC 3800 (Australia)
Publication Date:
OSTI Identifier:
22251621
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 1; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CAPACITORS; ELECTROLYTES; FILMS; IMPEDANCE; INTERFACES; ION DENSITY; POLYMERS; RESISTORS; SPECTRA; SPECTROSCOPY