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<p>PEDOTs were electrosynthesized in different media of PC-LiClO<sub>4</sub>, H<sub>2</sub>O-LiClO<sub>4</sub>, THF-TBAPF<sub>6</sub>, and IPA-TBAPF<sub>6</sub>, namely PEDOT-A, PEDOT-B, PEDOT-C, and PEDOT-D, which were compared and studied on their electrochemical, electrochromic, thermal properties and morphology. As p-type doping ion into PEDOT, ClO₄⁻ system exhibited a lower onset oxidation potential than the PF₆⁻. All system displayed a similar reduction peak potential around − 0.8&#xa0;V, accompany with lower oxidation peak potential in the ClO₄⁻ system compared to the PF₆⁻ system of cyclic voltammetry. PF₆⁻ doped PEDOT films maintained good redox activity with distinct and reversible redox peaks than ClO₄⁻ doped PEDOT films. Under the drive of voltage, all four types of PEDOT underwent reversible color changes, shifting from the blue-violet of the reduced state to the light blue of the oxidized state. Among them, the color change of PEDOT-A exhibited more pronounced, characterized by high optical contrast, attributed to its smooth and dense surface morphology. Because of the short response time and low current density in one oxidation or reduction cycle, PEDOT-C showed a smaller amount of charge migration per unit area, resulting in superior coloration efficiency of 233.9 cm<sup>2</sup> C<sup>-1</sup> (oxidation process) and 254.7 cm<sup>2</sup> C<sup>-1</sup> (reduction process) at 605&#xa0;nm, respectively. The differences in the doping systems have significant effects on the morphology and properties of PEDOT.</p>

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Further studies on the electrochemical and electrochromic behavior of PEDOT: based on ClO₄⁻ and PF₆⁻ doping systems

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Kaiwen Lin,
  • Lei Ding,
  • Zhanghan Ao,
  • Hao Liu,
  • Wangdaiqi Kong,
  • Yuanlin Li,
  • Binghui Lu,
  • Minling Zheng,
  • Liming Liu,
  • Qianshu Lv,
  • Hanxin Zhang

摘要

PEDOTs were electrosynthesized in different media of PC-LiClO4, H2O-LiClO4, THF-TBAPF6, and IPA-TBAPF6, namely PEDOT-A, PEDOT-B, PEDOT-C, and PEDOT-D, which were compared and studied on their electrochemical, electrochromic, thermal properties and morphology. As p-type doping ion into PEDOT, ClO₄⁻ system exhibited a lower onset oxidation potential than the PF₆⁻. All system displayed a similar reduction peak potential around − 0.8 V, accompany with lower oxidation peak potential in the ClO₄⁻ system compared to the PF₆⁻ system of cyclic voltammetry. PF₆⁻ doped PEDOT films maintained good redox activity with distinct and reversible redox peaks than ClO₄⁻ doped PEDOT films. Under the drive of voltage, all four types of PEDOT underwent reversible color changes, shifting from the blue-violet of the reduced state to the light blue of the oxidized state. Among them, the color change of PEDOT-A exhibited more pronounced, characterized by high optical contrast, attributed to its smooth and dense surface morphology. Because of the short response time and low current density in one oxidation or reduction cycle, PEDOT-C showed a smaller amount of charge migration per unit area, resulting in superior coloration efficiency of 233.9 cm2 C-1 (oxidation process) and 254.7 cm2 C-1 (reduction process) at 605 nm, respectively. The differences in the doping systems have significant effects on the morphology and properties of PEDOT.