Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene
- 作者: Kamensky M.1, Eliseeva S.1, Láng G.2, Ujvári M.2, Kondratiev V.1
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隶属关系:
- St. Petersburg State University, Institute of Chemistry
- Eötvös Loránd University
- 期: 卷 54, 编号 11 (2018)
- 页面: 893-901
- 栏目: Article
- URL: https://journals.rcsi.science/1023-1935/article/view/189644
- DOI: https://doi.org/10.1134/S1023193518130219
- ID: 189644
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详细
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.
作者简介
M. Kamensky
St. Petersburg State University, Institute of Chemistry
Email: svetlana.eliseeva@spbu.ru
俄罗斯联邦, St. Petersburg, 199034
S. Eliseeva
St. Petersburg State University, Institute of Chemistry
编辑信件的主要联系方式.
Email: svetlana.eliseeva@spbu.ru
俄罗斯联邦, St. Petersburg, 199034
G. Láng
Eötvös Loránd University
Email: svetlana.eliseeva@spbu.ru
匈牙利, Budapest, 1117
M. Ujvári
Eötvös Loránd University
Email: svetlana.eliseeva@spbu.ru
匈牙利, Budapest, 1117
V. Kondratiev
St. Petersburg State University, Institute of Chemistry
Email: svetlana.eliseeva@spbu.ru
俄罗斯联邦, St. Petersburg, 199034