Discovery of ZrCoBi based half Heuslers with high thermoelectric conversion efficiency
Author(s)Zhu, Hangtian; He, Ran; Mao, Jun; Zhu, Qing; Sun, Jifeng; Ren, Wuyang; Wang, Yumei; Liu, Zihang; Tang, Zhongjia; Sotnikov, Andrei; Wang, Zhiming; Broido, David; Singh, David J.; Ren, Zhifeng; Liu, Chunhua; Chen, Gang; Nielsch, Kornelius; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering
Nature Publishing Group
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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