Realizing high thermoelectric performance flexible free-standing PEDOT:PSS/Bi0.5Sb1.5Te3 composite films for power generation

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-04 DOI:10.1007/s12598-024-02860-0

Li Sun, Dong-Wei Ao, Junphil Hwang, Qin Liu, En-Si Cao, Bing Sun

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Abstract

Flexible thermoelectrics provide a distinct solution for developing sustainable and portable power supplies. Inorganic/organic material compositing is an effective strategy to induce a significant enhancement of thermoelectric (TE) performance. However, the poor electrical performance of inorganic/organic material is attributed to the poor carrier transport between organic/inorganic interfaces induced by the low contribution of composited inorganic materials. Herein, we prepared a high room temperature figure-of-merit (ZT) value of ~ 0.19 and high bending resistance (surviving 1200 bending cycles at the bending radius of 16.5 mm) of p-type poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS)/Bi_0.5Sb_1.5Te₃ free-standing composite film via a facile vacuum-assisted filtration approach. Compositing Bi_0.5Sb_1.5Te₃ nano-spherical particles into PEDOT:PSS results in the optimized interfacial contact and carrier concentration, leading to a high Seebeck coefficient of ~ 43.79 μV·K⁻¹. Accordingly, a high-power factor of ~ 1.52 μW·cm⁻¹·K⁻² is achieved in the PEDOT:PSS/Bi_0.5Sb_1.5Te₃ composite film at room temperature. In addition, the PEDOT:PSS/Bi_0.5Sb_1.5Te₃ interfaces with phase boundaries, nanograins and point defects could further decrease the thermal conductivity to ~ 0.20 W·m⁻¹·K⁻¹, leading to a high ZT value. Furthermore, a 6-leg free-standing film device was assembled, which provided an output power of 44.94 nW. This study demonstrates that free-standing organic/inorganic composite films are effective power sources for wearable electronic products.

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实现用于发电的高热电性能柔性独立式 PEDOT:PSS/Bi0.5Sb1.5Te3 复合薄膜

柔性热电为开发可持续的便携式电源提供了独特的解决方案。无机/有机材料复合是显著提高热电（TE）性能的有效策略。然而，无机/有机材料的电性能较差，原因在于复合无机材料的贡献率较低，导致有机/无机界面之间的载流子传输较差。在此，我们通过一种简便的真空辅助过滤方法制备出了室温等效系数（ZT）值约为 0.19 的高抗弯性（在弯曲半径为 16.5 毫米的条件下可承受 1200 次弯曲循环）p 型聚（3,4-亚乙二氧基噻吩）：聚（4-苯乙烯磺酸盐）（PEDOT：PSS）/Bi0.5Sb1.5Te3 独立复合膜。将 Bi0.5Sb1.5Te3 纳米球形颗粒复合到 PEDOT:PSS 中可优化界面接触和载流子浓度，从而获得约 43.79 μV-K-1 的高塞贝克系数。因此，在室温下，PEDOT:PSS/Bi0.5Sb1.5Te3 复合薄膜的功率因数达到了约 1.52 μW-cm-1-K-2。此外，带有相界、纳米晶粒和点缺陷的 PEDOT:PSS/Bi0.5Sb1.5Te3 界面可进一步将热导率降至 ~ 0.20 W-m-1-K-1，从而实现较高的 ZT 值。此外，还组装了一个 6 脚独立式薄膜器件，其输出功率为 44.94 nW。这项研究表明，独立式有机/无机复合薄膜是可穿戴电子产品的有效电源。图文摘要

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.