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%.

中文翻译：

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氧化还原电解质对PEDOT-(1,2-萘醌-4-磺酸钠)/WMNT纳米复合电极电化学特性的影响

摘要

采用循环伏安法、恒电流充放电法和电化学阻抗谱法研究了电解质氧化还原对聚(3,4-乙烯二氧噻吩)(PEDOT)导电聚合物和多壁碳复合材料电化学特性的影响。纳米管（MWCNT）。为了在纳米管表面形成均匀的 PEDOT 薄层，使用了单体的酶促聚合。电化学活性化合物 1,2-萘醌-4-磺酸钠 (NQS) 是 PEDOT 主链中的掺杂剂，同时也是电解质的组成部分。在电解质中添加 12.5 mM NQS，在电位扫描速率为 10 mV/s 时，PEDOT-NQS/MWCNT 复合电极的比电容从 390 F/g 增加到 800 F/g。在 1 MH ₂ SO中₄ + 12.5 mM NQS氧化还原电解质，与1 MH ₂ SO ₄相比，复合电极表现出更高的循环稳定性和更低的电荷转移电阻。以100 mV/s的速率在–0.1至0.8 V范围内进行1000次电位扫描循环后，复合电极在1 MH ₂ SO ₄溶液中的比电容下降了8%，在1 MH ₂ SO ₄ + 12.5 mm NQS 增加约9%。