Wet Spun Composite Fiber with an Ordered Arrangement of PEDOT:PSS‐Coated Te Nanowires for High‐Performance Wearable Thermoelectric Generator

作者：Jiajia Li, Junhui Wang, Xiao Yang, Guoying Dong, Ying Liu, Zixing Wang, Mingcheng Zhang, Xinru Zuo, Xiaowen Han, Changxuan Wu, Ting Zhang, Ruiheng Liu, Kefeng Cai, Lidong Chen · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202404195 · 被引用次数：36 · 研究领域：Advanced Thermoelectric Materials and Devices、Thermal Radiation and Cooling Technologies、Conducting polymers and applications

Abstract Thermoelectric (TE) fibers are more suitable than films for portable or wearable devices. Herein, 2–3 nm thick poly (3,4‐ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS) layer‐coated tellurium nanowires (PC‐Te NWs) are in situ prepared by a hydrothermal method. Then a series of PEDOT: PSS/PC‐Te NWs composite fibers are prepared by wet spinning and post‐treatment. The nanolayer prevents the agglomeration of the Te NWs and makes the NWs and PEDOT:PSS matrix have good compatibility, which results in the PC‐Te NWs content to a high value of 70 wt% and the fibers still with flexibility. The high aspect ratio of the PC‐Te NWs and the stress from the inner wall of the needle during spinning make the NWs ordered align along the composite fiber. Due to the large content and orientational arrangement of the PC‐Te NWs, as well as effective post‐treatment, an optimized composite fiber shows a power factor of 385.4 µW m −1 K −2 at 300 K, which is ≈4.9 times as high as the highest value of previously reported PEDOT:PSS/Te NWs‐based composite fibers. In addition, the composite fiber has good flexibility. The flexible TE generators assembled have excellent output performance. This work provides an effective strategy for the preparation of high‐performance flexible TE composite fibers.