Discovery of ZrCoBi based half Heuslers with high thermoelectric conversion efficiency
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Author(s)
Zhu, Hangtian
He, Ran
Mao, Jun
Zhu, Qing
Sun, Jifeng
Ren, Wuyang
Wang, Yumei
Liu, Zihang
Tang, Zhongjia
Sotnikov, Andrei
Date Issued
June 2018
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Zhu, Hangtian, Ran He, Jun Mao, Qing Zhu, Chunhua Li, Jifeng Sun, Wuyang Ren, et al. “Discovery of ZrCoBi Based Half Heuslers with High Thermoelectric Conversion Efficiency.” Nature Communications 9, no. 1 (June 27, 2018).
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Final published version
Abstract
Thermoelectric materials are capable of converting waste heat into electricity. The dimensionless figure-of-merit (ZT), as the critical measure for the material's thermoelectric performance, plays a decisive role in the energy conversion efficiency. Half-Heusler materials, as one of the most promising candidates for thermoelectric power generation, have relatively low ZTs compared to other material systems. Here we report the discovery of p-type ZrCoBi-based half-Heuslers with a record-high ZT of ∼1.42 at 973 K and a high thermoelectric conversion efficiency of ∼9% at the temperature difference of ∼500 K. Such an outstanding thermoelectric performance originates from its unique band structure offering a high band degeneracy (Nv) of 10 in conjunction with a low thermal conductivity benefiting from the low mean sound velocity (vm∼2800 m s-1). Our work demonstrates that ZrCoBi-based half-Heuslers are promising candidates for high-temperature thermoelectric power generation.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/s41467-018-04958-3
