Optimization of Wet-Spun PEDOT:PSS Fibers for Thermoelectric Applications Through Innovative Triple Post-treatments

IF 17.2 1区 工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yu-Yu Deng, Xiao-Lei Shi, Ting Wu, Yicheng Yue, Wei-Di Liu, Meng Li, Fang Yue, Pei Huang, Qingfeng Liu, Zhi-Gang Chen
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Abstract

Owing to the high flexibility, low thermal conductivity, and tunable electrical transport property, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibits promising potential for designing flexible thermoelectric devices in the form of films or fibers. However, the low Seebeck coefficient and power factor of PEDOT:PSS have restricted its practical applications. Here, we sequentially employ triple post-treatments with concentrated sulfuric acid (H2SO4), sodium borohydride (NaBH4), and 1-ethyl-3-methylimidazolium dichloroacetate (EMIM:DCA) to enhance the thermoelectric performance of flexible PEDOT:PSS fibers with a high power factor of (55.4 ± 1.8) μW m−1 K−2 at 25 °C. Comprehensive characterizations confirm that excess insulating PSS can be selectively removed after H2SO4 and EMIM:DCA treatments, which induces conformational changes to increase charge carrier mobility, leading to enhanced electrical conductivity. Simultaneously, NaBH4 treatment is employed to adjust the oxidation level, further optimizing the Seebeck coefficient. Additionally, the assembled flexible fiber thermoelectric devices show an output power density of (60.18 ± 2.79) nW cm−2 at a temperature difference of 10 K, proving the superior performance and usability of the optimized fibers. This work provides insights into developing high-performance organic thermoelectric materials by modulating polymer chains.

Graphical Abstract

Abstract Image

通过创新的三重后处理优化用于热电应用的湿法纺丝 PEDOT:PSS 纤维
聚(3,4-亚乙二氧基噻吩):聚(苯乙烯磺酸)(PEDOT:PSS)具有高柔韧性、低热导率和可调电传输特性,因此在设计薄膜或纤维形式的柔性热电器件方面具有广阔的前景。然而,PEDOT:PSS 的低塞贝克系数和功率因数限制了其实际应用。在这里,我们依次使用浓硫酸(H2SO4)、硼氢化钠(NaBH4)和二氯乙酸 1-乙基-3-甲基咪唑鎓(EMIM:DCA)进行三重后处理,以提高柔性 PEDOT:PSS 纤维的热电性能,使其在 25 °C 时的功率因数高达 (55.4 ± 1.8) μW m-1 K-2。综合表征证实,经过 H2SO4 和 EMIM:DCA 处理后,多余的绝缘 PSS 可以被选择性地去除,从而诱导构象变化,增加电荷载流子的迁移率,从而提高导电性。同时,NaBH4 处理可调整氧化水平,进一步优化塞贝克系数。此外,组装好的柔性光纤热电器件在 10 K 的温差下显示出 (60.18 ± 2.79) nW cm-2 的输出功率密度,证明了优化光纤的卓越性能和可用性。这项工作为通过调节聚合物链开发高性能有机热电材料提供了启示。 图文摘要
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来源期刊
CiteScore
18.70
自引率
11.20%
发文量
109
期刊介绍: Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al. Publishing on fiber or fiber-related materials, technology, engineering and application.
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