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Title: Understanding the asymmetrical thermoelectric performance for discovering promising thermoelectric materials

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [2];  [2]; ORCiD logo [4];  [5]; ORCiD logo [2]
  1. Univ. of Houston, TX (United States); DOE/OSTI
  2. Univ. of Houston, TX (United States)
  3. Univ. of Missouri, Columbia, MO (United States); Chinese Academy of Sciences (CAS), Hefei (China); Univ. of Science and Technology of China, Hefei (China)
  4. Univ. of Missouri, Columbia, MO (United States)
  5. Chinese Academy of Sciences (CAS), Beijing (China)

Thermoelectric modules, consisting of multiple pairs of n- and p-type legs, enable converting heat into electricity and vice versa. However, the thermoelectric performance is often asymmetrical, in that one type outperforms the other. In this paper, we identified the relationship between the asymmetrical thermoelectric performance and the weighted mobility ratio, a correlation that can help predict the thermoelectric performance of unreported materials. Here, a reasonably high ZT for the n-type ZrCoBi-based half-Heuslers is first predicted and then experimentally verified. A high peak ZT of ~1 at 973 K can be realized by ZrCo0.9Ni0.1Bi0.85Sb0.15. The measured heat-to-electricity conversion efficiency for the unicouple of ZrCoBi-based materials can be as high as ~10% at the cold-side temperature of ~303 K and at the hot-side temperature of ~983 K. Our work demonstrates that the ZrCoBi-based half-Heuslers are highly promising for the application of mid- and high-temperature thermoelectric power generation.

Research Organization:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0019114
OSTI ID:
1613120
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 6 Vol. 5; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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