The Effect of Redox Electrolyte on the Electrochemical Characteristics of a PEDOT–(Sodium 1,2-Naphthoquinone-4-sulfonate)/WMNT Nanocomposite Electrode

G. P. Shumakovich; Шумакович Г. П.; I. S. Vasilyeva; Васильева И. С.; V. V. Emets; Емец В. В.; V. A. Bogdanovskaya; Богдановская В. А.; A. V. Kuzov; Кузов А. В.; V. N. Andreev; Андреев В. Н.; O. V. Morozova; Морозова О. В.; A. I. Yaropolov; Ярополов А. И.

doi:10.31857/S0044185623700559

The Effect of Redox Electrolyte on the Electrochemical Characteristics of a PEDOT–(Sodium 1,2-Naphthoquinone-4-sulfonate)/WMNT Nanocomposite Electrode

Authors: Shumakovich G.P.¹, Vasilyeva I.S.¹, Emets V.V.², Bogdanovskaya V.A.³, Kuzov A.V.², Andreev V.N.³, Morozova O.V.¹, Yaropolov A.I.¹
Affiliations:
1. Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences
2. Frumkin Institute of Physical Chemistry and Electrochemistry, Academy of Sciences
3. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Issue: Vol 59, No 4 (2023)
Pages: 397-404
Section: НАНОРАЗМЕРНЫЕ И НАНОСТРУКТУРИРОВАННЫЕ МАТЕРИАЛЫ И ПОКРЫТИЯ
URL: https://vestnik.nvsu.ru/0044-1856/article/view/663911
DOI: https://doi.org/10.31857/S0044185623700559
EDN: https://elibrary.ru/YCXCAW
ID: 663911

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Abstract

The methods of cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy were used to study the effect of electrolyte redox on the electrochemical characteristics of a composite based on a poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer and multiwalled carbon nanotubes (MWCNTs). To form a uniform thin layer of PEDOT on the surface of nanotubes, an enzymatic polymerization of the monomer was used. The electrochemically active compound sodium 1,2‑naphthoquinone-4-sulfonate (NQS) was a dopant in the main PEDOT chain and, at the same time, a component of the electrolyte. The addition of 12.5 mM NQS to the electrolyte increased the specific capacitance of the PEDOT–NQS/MWCNT composite electrode from 390 to 800 F/g at a potential sweep rate of 10 mV/s. In a 1 M H2SO4 + 12.5 mM NQS redox electrolyte, the composite electrode exhibited higher cyclic stability and lower charge transfer resistance compared to 1 M H2SO4. After 1000 cycles of potential scanning in the range from –0.1 to 0.8 V at a rate of 100 mV/s, the specific capacitance of the composite electrode in a solution of 1 M H2SO4 decreased by 8%, and in a solution of 1 M H2SO4 + 12.5 mm NQS increased by approximately 9%.

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