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

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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%.

作者简介

G. Shumakovich

Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences

Email: victoremets@mail.ru
119071, Moscow, Russia

I. Vasilyeva

Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences

Email: victoremets@mail.ru
119071, Moscow, Russia

V. Emets

Frumkin Institute of Physical Chemistry and Electrochemistry, Academy of Sciences

Email: victoremets@mail.ru
119071, Moscow, Russia

V. Bogdanovskaya

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: bogd@elchem.ac.ru
Moscow, 119071 Russia

A. Kuzov

Frumkin Institute of Physical Chemistry and Electrochemistry, Academy of Sciences

Email: victoremets@mail.ru
119071, Moscow, Russia

V. Andreev

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: elena_pisarevska@bk.ru
Moscow, Russia

O. Morozova

Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences

Email: victoremets@mail.ru
119071, Moscow, Russia

A. Yaropolov

Bach Institute of Biochemistry, Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: victoremets@mail.ru
119071, Moscow, Russia

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版权所有 © Г.П. Шумакович, И.С. Васильева, В.В. Емец, В.А. Богдановская, А.В. Кузов, В.Н. Андреев, О.В. Морозова, А.И. Ярополов, 2023

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