High-performance post-treatment-free PEDOT based thermoelectric with the establishment of long-range ordered conductive paths
High-performance post-treatment-free PEDOT based thermoelectric with the establishment of long-range ordered conductive paths
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DOI：
10.1016/j.cej.2022.140047
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发表时间：
2022-11-01
影响因子：
15.1
通讯作者：
Zhang, Peng
中科院分区：
文献类型：
--
作者：
Li, Xin;He, Zhenhang;Zhang, Peng
在这项工作中，制备了由聚（3,4-乙烯二氧噻吩）、聚（苯乙烯磺酸盐）（PEDOT:PSS）和离子液体（ILs）组成的免后处理聚合物杂化体，用于热电（TE）应用。通过优化il的摩尔浓度（0-0.5 M）和化学组成，即改变氰基阴离子与1-乙基-3-甲基咪唑阳离子的偶联，获得了较高的TE性能（功率因数为190 μ W M (-1) K-2）。优异的TE性能归功于分子结构（如PEDOT链的氧化水平、构象和结晶）和微观结构（远程有序导电路径）耦合作用下的导电网络。利用微傅里叶变换红外光谱和小角度x射线散射对其进行了详细的结构分析，证明了长程导电路径是由棒状微畴构成的。这些路径使载流子在PEDOT:PSS/IL杂化体的微域之间传输。此外，PEDOT:PSS/IL混合材料的导电网络表现出良好的环境和机械稳定性，使柔性TE发电机的制造成为可能。
In this work, post-treatment-free polymer hybrids, consisting of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and ionic liquids (ILs), were fabricated for the thermoelectric (TE) application. By optimizing the ILs' molar concentration (0-0.5 M) and chemical composition, that is varying the cyano-based anions coupled with 1-ethyl-3-methylimidazolium cations, a high TE performance (power factor of 190 mu W m(-1) K-2) was achieved. The excellent TE performance was attributed to the conductive network under the coupling effect of molecular structure (such as oxidation level, conformation and crystallization of PEDOT chains) and microstructure (long-range ordered conductive paths). Especially, the long-range conductive paths were proved to be made of rod-like microdomains, based on detailed structure analysis with micro-Fourier transform infrared spectroscopy and small-angle X-ray scattering. These paths enabled carrier transport among microdomains of PEDOT:PSS/IL hybrids. Moreover, the conductive network of PEDOT:PSS/IL hybrids showed good environmental and mechanical stability, enabling the fabrication of flexible TE generators.