Bi2Te3-Based Thermoelectric Modules for Efficient and Reliable Low-Grade Heat Recovery

Bi2Te3-Based Thermoelectric Modules for Efficient and Reliable Low-Grade Heat Recovery

© 2024 Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 26 vom: 08. Juni, Seite e2400285
1. Verfasser: Wu, Gang (VerfasserIn)
Weitere Verfasser: Zhang, Qiang, Tan, Xiaojian, Fu, Yuntian, Guo, Zhe, Zhang, Zongwei, Sun, Qianqian, Liu, Yan, Shi, Huilie, Li, Jingsong, Noudem, Jacques G, Wu, Jiehua, Liu, Guo-Qiang, Sun, Peng, Hu, Haoyang, Jiang, Jun
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article CuGaTe2 conversion efficiency n‐type bismuth telluride thermoelectric
Beschreibung
Zusammenfassung:© 2024 Wiley‐VCH GmbH.
Bismuth-telluride-based alloy has long been considered as the most promising candidate for low-grade waste heat power generation. However, optimizing the thermoelectric performance of n-type Bi2Te3 is more challenging than that of p-type counterparts due to its greater sensitivity to texture, and thus limits the advancement of thermoelectric modules. Herein, the thermoelectric performance of n-type Bi2Te3 is enhanced by incorporating a small amount of CuGaTe2, resulting in a peak ZT of 1.25 and a distinguished average ZT of 1.02 (300-500 K). The decomposed Cu+ strengthens interlayer interaction, while Ga+ optimizes carrier concentration within an appropriate range. Simultaneously, the emerged numerous defects, such as small-angle grain boundaries, twin boundaries, and dislocations, significantly suppresses the lattice thermal conductivity. Based on the size optimization by finite element modelling, the constructed thermoelectric module yields a high conversion efficiency of 6.9% and output power density of 0.31 W cm-2 under a temperature gradient of 200 K. Even more crucially, the efficiency and output power little loss after subjecting the module to 40 thermal cycles lasting for 6 days. This study demonstrates the efficient and reliable Bi2Te3-based thermoelectric modules for broad applications in low-grade heat harvest
Beschreibung:Date Revised 26.06.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202400285