Impurity Removal Leading to High-Performance CoSb3‑Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction
Article
Article Title | Impurity Removal Leading to High-Performance CoSb3‑Based Skutterudites with Synergistic Carrier Concentration Optimization and Thermal Conductivity Reduction |
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ERA Journal ID | 40638 |
Article Category | Article |
Authors | Li, Xu-Guang (Author), Liu, Wei-Di (Author), Li, Shuang-Ming (Author), Li, Dou (Author), Zhong, Hong (Author) and Chen, Zhi-Gang (Author) |
Journal Title | ACS Applied Materials and Interfaces |
Journal Citation | 13 (45), pp. 54185-54193 |
Number of Pages | 9 |
Year | 2021 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 1944-8244 |
1944-8252 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsami.1c16622 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acsami.1c16622 |
Abstract | Thermoelectric properties of CoSb3-based skutterudites are greatly determined by the removal of detrimental impurities, such as (Fe/Co)Sb2, (Fe/Co)Sb, and Sb. In this study, we use a facile temperature gradient zone melting (TGZM) method to synthesize high-performance CoSb3-based skutterudites by impurity removal. After removing metallic or semimetallic impurities (Fe/Co)Sb, (Fe/Co)Sb2, and Sb, the carrier concentration of TGZM-Ce0.75Fe3CoSb12 can be reduced to 1.21 × 1020 cm–3 and the electronic thermal conductivity dramatically reduced to 0.7 W m–1 K–1 at 693 K. Additionally, removing these impurities also effectively reduces the lattice thermal conductivity from 7.2 W m–1 K–1 of cast-Ce0.75Fe3CoSb12 to 1.02 W m–1 K–1 of TGZM-Ce0.75Fe3CoSb12 at 693 K. As a consequence, TGZM-Ce0.75Fe3CoSb12 approaches a high power factor of 11.7 μW cm–1 K–2 and low thermal conductivity of 1.72 W m–1 K–1 at 693 K, leading to a peak zT of 0.48 at 693 K, which is 10 times higher than that of cast-Ce0.75Fe3CoSb12. This study indicates that our facile TGZM method can effectively synthesize high-performance CoSb3-based skutterudites by impurity removal and set up a solid foundation for further development. |
Keywords | thermoelectric; CoSb3; temperature gradient zone melting; synthesis; thermal conductivity |
ANZSRC Field of Research 2020 | 401603. Compound semiconductors |
401605. Functional materials | |
340301. Inorganic materials (incl. nanomaterials) | |
401807. Nanomaterials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Northwestern Polytechnical University, China |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7554/impurity-removal-leading-to-high-performance-cosb3-based-skutterudites-with-synergistic-carrier-concentration-optimization-and-thermal-conductivity-reduction
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