Optimal array alignment to deliver high performance in flexible conducting polymer-based thermoelectric devices

Xu, Shengduo and Li, Meng and Hong, Min ORCID: https://orcid.org/0000-0002-6469-9194 and Yang, Lei and Sun, Qiang and Sun, Shuai and Lyu, Wanyu and Dargusch, Matthew and Zou, Jin and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2022) Optimal array alignment to deliver high performance in flexible conducting polymer-based thermoelectric devices. Journal of Materials Science and Technology, 124. pp. 252-259. ISSN 1005-0302


Abstract

Flexible thermoelectric devices (F-TEDs) show great potentials to be applied in curved surface for power generation by harvesting low-grade energy from human body and other heat sources. However, their power generation efficiency is constrained by both unsatisfactory constituent materials performance and immature device design. Here, we used an optimal alignment of vertically-aligned poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) arrays to assemble a 2.7 × 3.2 cm2 F-TEDs, exhibiting a maximum power output of 10.5 µW. Such a high performance can be ascribed to the outstanding power factor of 198 µW m − 1 K − 2 by the synergetic effect of both high charge mobility and optimal oxidation level and the optimized array alignment that maximizes the temperature difference utilization ratio across the TE legs. Particularly, optimized leg distance of 6 mm and leg length of 12 mm are determined to realize a high temperature difference utilization ratio of over 95% and a record-high output power density of 1.21 µW cm−2 under a temperature difference of 30 K. Further, reliable bending (1000 cycles) and stability (240 h) tests indicate the outstanding mechanical robustness and environmental stability of the developed F-TEDs. This study indicates our reasonable device design concept and facile material treatment techniques secure high-performance F-TEDs, serving as a reference for other flexible energy harvesting devices with wide practical applications.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 14 Jun 2022 01:31
Last Modified: 14 Jun 2022 01:31
Uncontrolled Keywords: Flexible thermoelectric device; Optimized power density; Performance optimization; TE array alignment
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401699 Materials engineering not elsewhere classified
40 ENGINEERING > 4008 Electrical engineering > 400803 Electrical energy generation (incl. renewables, excl. photovoltaics)
Identification Number or DOI: https://doi.org/10.1016/j.jmst.2022.03.007
URI: http://eprints.usq.edu.au/id/eprint/49044

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