Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene

Standard

Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene. / Kamensky, M. A. ; Eliseeva, S. N. ; Láng, G.G.; Ujvári, M.; Kondratiev, V. V. .

In: Russian Journal of Electrochemistry, Vol. 54, No. 11, 2018, p. 893–901.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{64d7d3dec4c444ccaebbbd49f8eb0bde,

title = "Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene",

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.",

keywords = "conducting polymers, poly-3,4-ethylenedioxythiophene, overoxidation, cyclic voltammetry, impedance spectroscopy, electrochemical properties, degradation",

author = "Kamensky, {M. A.} and Eliseeva, {S. N.} and G.G. L{\'a}ng and M. Ujv{\'a}ri and Kondratiev, {V. V.}",

note = "Kamensky, M.A., Eliseeva, S.N., L{\'a}ng, G. et al. Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene. Russ J Electrochem 54, 893–901 (2018). https://doi.org/10.1134/S1023193518130219",

year = "2018",

language = "English",

volume = "54",

pages = "893–901",

journal = "Russian Journal of Electrochemistry",

issn = "1023-1935",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "11",

}

RIS

TY - JOUR

T1 - Electrochemical Properties of Overoxidized Poly-3,4-Ethylenedioxythiophene

AU - Kamensky, M. A.

AU - Eliseeva, S. N.

AU - Láng, G.G.

AU - Ujvári, M.

AU - Kondratiev, V. V.

N1 - 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

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - conducting polymers

KW - poly-3,4-ethylenedioxythiophene

KW - overoxidation

KW - cyclic voltammetry

KW - impedance spectroscopy

KW - electrochemical properties

KW - degradation

UR - https://link.springer.com/article/10.1134/S1023193518130219

M3 - Article

VL - 54

SP - 893

EP - 901

JO - Russian Journal of Electrochemistry

JF - Russian Journal of Electrochemistry

SN - 1023-1935

IS - 11

ER -

ID: 36097122