Scalable printing high-performance and self-healable Ag2Se/terpineol nanocomposite film for flexible thermoelectric device

Mingcheng Zhang, Ying Liu, Jiajia Li, Changxuan Wu, Zixing Wang, Yuexin Liu, Ping Wei, Wenyu Zhao and Kefeng Cai

Energy, 2024, vol. 296, issue C

Abstract: Flexible thermoelectric (TE) generators (f-TEGs) are promising candidates to power explosively growing wearable electronics by continually converting body heat into electricity. However, intrinsic brittleness, unscalability, and high costs hinder high-performance bulk TE materials from application as f-TEGs. Herein, we report a flexible and self-healable Ag2Se/terpineol composite film on a nylon membrane prepared by first one-pot synthesis of Ag2Se powder, then screen-printing, and finally low-temperature (473 K) heat treatment. Microstructure observations reveal that the film is dense and that it consists of nano to micron Ag2Se grains with coherent- and semicoherent grain boundaries and a very small amount of terpineol at nanopores and/or grain boundaries. Because of the unique microstructure and synergistic effect of the two components, an optimal film exhibits a high power factor of 1550 μW m−1 K−2 (corresponding zT ∼ 0.8) at room temperature and good mechanical properties (flexibility, anti-tensile property, and self-healing ability). A six-leg f-TEG assembled with the film shows a power density of 16.23 W m−2 at a temperature difference of 34.1 K and excellent flexibility.

Keywords: Flexible thermoelectrics; Ag2Se; Nanocomposite; Screen-printing (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:296:y:2024:i:c:s0360544224010053

DOI: 10.1016/j.energy.2024.131232

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