Electrosynthesis of a flexible n-type polypyrrole/silver selenide thermoelectric nanocomposite film with ultra-high power factors

• Published in: Applied surface science Vol. 665; p. 160359
• Main Authors: Li, Yang, Gao, Cai-Yan, Chen, Zhi-Ping, Li, Hui-Ping, Fan, Xin-Heng, Cao, Xingbo, Yang, Lian-Ming
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.08.2024
• Subjects: Electrosynthesis; Nanocomposite; Polypyrrole; Silver selenide; Thermoelectric materials; Thermoelectric materials; Silver selenide; Electrosynthesis; Nanocomposite; Polypyrrole
• DOI: 10.1016/j.apsusc.2024.160359
• ISSN: 0169-4332

A series of flexible n-type PPy/AgxSe free-standing nanocomposite films have been prepared successfully by a simple and efficient two-step electrosynthesis method for the first time. Through the regulation of the electrodeposition potentials for AgxSe and the electrodeposition time for PPy on the interfacial engineering, an optimized power factor was achieved to be as high as 1831.8 µW/m K−2. This work provides a new, feasible access to the development of high-performance n-type thermoelectric materials as well as a broader prospect for thermoelectric materials with limited application scenarios in the future. [Display omitted] •Preparing n-type PPy/AgxSe composite films by a two-step electrosynthesis.•Adjusting thermoelectric performance through interfacial engineering.•Improving bending flexibility and air stability by compositing AgxSe with PPy.•Perfecting power factor through the synergist effect. n-Type thermoelectric (TE) materials have long been recognized as a fascinating but challenging research topic in TE field mainly due to their scarcity and environmental instability. Moreover, with the advent of flexible wearable TE devices, higher requirements have been put forward for n-type TE materials. In this work, we developed a series of flexible n-type PPy/AgxSe free-standing nanocomposite films for the first time by a simple and efficient two-step electrosynthesis method, where AgxSe determines the n-type TE performance of the composite film, and PPy acts both as a flexible substrate and as a conductive bridging agent between the AgxSe grains. Through the regulation of the deposition potentials for AgxSe and the deposition time for PPy on the interfacial engineering, the optimized composite film achieved a largest power factor of up to 1831.8 ± 124.6 µW m−1 K−2. This work provides a new, feasible access to the development of high-performance n-type TE materials as well as a broader prospect for TE materials with limited application scenarios in the future.