Discovery of ZrCoBi based half Heuslers with high thermoelectric conversion efficiency

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Date
2018
Volume
9
Issue
1
Journal
Nature Communications
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Publisher
London : Nature Publishing Group
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 (N v) of 10 in conjunction with a low thermal conductivity benefiting from the low mean sound velocity (v m ∼2800 m s-1). Our work demonstrates that ZrCoBi-based half-Heuslers are promising candidates for high-temperature thermoelectric power generation.

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Zhu, H., He, R., Mao, J., Zhu, Q., Li, C., Sun, J., et al. (2018). Discovery of ZrCoBi based half Heuslers with high thermoelectric conversion efficiency (London : Nature Publishing Group). London : Nature Publishing Group. https://doi.org//10.1038/s41467-018-04958-3
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CC BY 4.0 Unported