TY - JOUR
T1 - High-performance post-treatment-free PEDOT based thermoelectric with the establishment of long-range ordered conductive paths
AU - Li, Xin
AU - He, Zhenhang
AU - Liu, Zhen
AU - Chen, Yu
AU - Zhou, Zekun
AU - Chen, Guixiang
AU - Qi, Weiheng
AU - Rauber, Daniel
AU - W. M. Kay, Christopher
AU - Zhang, Peng
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - 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 μW 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.
AB - 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 μW 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.
KW - Ionic liquid
KW - PEDOT:PSS
KW - Post-treatment-free
KW - Structure–property correlation
KW - Thermoelectric
UR - http://www.scopus.com/inward/record.url?scp=85143793045&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.140047
DO - 10.1016/j.cej.2022.140047
M3 - Article
AN - SCOPUS:85143793045
SN - 1385-8947
VL - 454
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 140047
ER -