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Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene

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Abstract

The properties of poly(3,4-ethylenedioxythiophene) (PEDOT) films were studied electrochemically at high positive potentials (from–0.3 to 1.5 V relative to the Ag/AgCl electrode). A cyclic voltammetry (CV) study revealed the range of potentials (up to 1.3–1.5 V) where the cycling leads to significant changes in the electrochemical, structural, and morphological properties of the polymer film due to overoxidation. When the upper cycling potential Eup exceeded 1.4 V, the anodic current significantly increased during the first cycle and then decreased, which suggests a loss of the electroactivity of the polymer and degradation of its properties. In the high-frequency region of the impedance spectra of the PEDOT films, a semicircle appears after overoxidation, which indicates a notable increase of the charge transfer resistance in the system, in contrast to the films subjected to potentiodymanic processing in a limited range of potentials from–0.3 to 1.3 V. The effect of overoxidation on the polymer morphology was studied by scanning electron microscopy. The chemical state of elements in the structure of the polymer film was determined by X-ray photoelectron spectroscopy. The obtained data indicate that–S=O groups formed at the thiophene sulfur in the polymer.

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Authors and Affiliations

  1. St. Petersburg State University, Institute of Chemistry, St. Petersburg, 199034, Russia

    M. A. Kamensky, S. N. Eliseeva & V. V. Kondratiev

  2. Eötvös Loránd University, Institute of Chemistry, Budapest, 1117, Hungary

    G. Láng & M. Ujvári

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  1. M. A. Kamensky
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  2. S. N. Eliseeva
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  3. G. Láng
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  4. M. Ujvári
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  5. V. V. Kondratiev
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Correspondence to S. N. Eliseeva.

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Original Russian Text © M.A. Kamensky, S.N. Eliseeva, G. Láng, M. Ujvári, V.V. Kondratiev, 2018, published in Elektrokhimiya, 2018, Vol. 54, No. 10S, pp. S70–S80.

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Kamensky, M.A., Eliseeva, S.N., Láng, G. et al. Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene. Russ J Electrochem 54, 893–901 (2018). https://doi.org/10.1134/S1023193518130219

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