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<p>Organic thermoelectric materials possess noteworthy advantages in mechanical flexibility, low-cost synthesis and solution handling compared with their inorganic counterparts and hence have attracted much more attention nowadays. Poly(3,4-ethylenedioxythiophene: polystyrene sulfonate) (PEDOT: PSS) has good thermal stability and low thermal conductivity, rendering it one of the most promising organic thermoelectric materials. In this work, PEDOT: PSS films were prepared by gel-film forming method, exhibiting good flexibility and self-supporting properties. Subsequently, sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) and potassium hydroxide (KOH) were employed for the post-treatment of the film to improve its thermoelectric properties. The combination of ethanol-assisted film formation and H<sub>2</sub>SO<sub>4</sub> treatment effectively removes excess PSS from the PEDOT: PSS film and transforms the benzene-type structure of PEDOT chain into a linear quinone-type structure. Acid treatment elevates carrier mobility and consequently enhances conductivity, leading to the enhancement of the thermoelectric properties of the PEDOT: PSS film. The subsequent KOH treatment increases the Seebeck coefficient by reducing the oxidation level and further improving the thermoelectric properties. The experimental results showed that the maximum power factor (PF) of PEDOT: PSS film reached 37.1 µW/(m·K<sup>2</sup>) when post-treated with 15 M H<sub>2</sub>SO<sub>4</sub> and 1&#xa0;M KOH, which is much higher than that of the film without post-treatment. These results show that acidic and alkaline post-treatment are effective methods to improve the PF of PEDOT: PSS thin-film organic thermoelectric material, which may give one of the feasible and possible choices to enhance the practical applications of flexible thermoelectric materials.</p>

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Enhanced thermoelectric properties of PEDOT: PSS self-supporting films prepared by ethanol gel- film formation method with acidic and alkaline post-treatments

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Yihuai Li,
  • Chengpeng Bao,
  • Lan Dong,
  • Yuanyuan Wang,
  • Zihua Wu,
  • Huaqing Xie

摘要

Organic thermoelectric materials possess noteworthy advantages in mechanical flexibility, low-cost synthesis and solution handling compared with their inorganic counterparts and hence have attracted much more attention nowadays. Poly(3,4-ethylenedioxythiophene: polystyrene sulfonate) (PEDOT: PSS) has good thermal stability and low thermal conductivity, rendering it one of the most promising organic thermoelectric materials. In this work, PEDOT: PSS films were prepared by gel-film forming method, exhibiting good flexibility and self-supporting properties. Subsequently, sulfuric acid (H2SO4) and potassium hydroxide (KOH) were employed for the post-treatment of the film to improve its thermoelectric properties. The combination of ethanol-assisted film formation and H2SO4 treatment effectively removes excess PSS from the PEDOT: PSS film and transforms the benzene-type structure of PEDOT chain into a linear quinone-type structure. Acid treatment elevates carrier mobility and consequently enhances conductivity, leading to the enhancement of the thermoelectric properties of the PEDOT: PSS film. The subsequent KOH treatment increases the Seebeck coefficient by reducing the oxidation level and further improving the thermoelectric properties. The experimental results showed that the maximum power factor (PF) of PEDOT: PSS film reached 37.1 µW/(m·K2) when post-treated with 15 M H2SO4 and 1 M KOH, which is much higher than that of the film without post-treatment. These results show that acidic and alkaline post-treatment are effective methods to improve the PF of PEDOT: PSS thin-film organic thermoelectric material, which may give one of the feasible and possible choices to enhance the practical applications of flexible thermoelectric materials.