Twin Engineering in Solution‐Synthesized Nonstoichiometric Cu5FeS4 Icosahedral Nanoparticles for Enhanced Thermoelectric Performance |
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| Authors: | Aijuan Zhang Bin Zhang Wei Lu Dandan Xie Hongxia Ou Xiaodong Han Jiyan Dai Xu Lu Guang Han Guoyu Wang Xiaoyuan Zhou |
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| Affiliation: | 1. College of Physics, Chongqing University, Chongqing, China;2. Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, China;3. Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong;4. College of Materials Science and Engineering, Chongqing University, Chongqing, China;5. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China;6. University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | A facile colloidal solution method has been developed for the fast, scalable synthesis of orthorhombic@cubic core–shell nonstoichiometric Cu5FeS4 icosahedral nanoparticles. Such nanoparticles contain high‐density twin boundaries in the form of fivefold twins. Spark plasma sintering consolidates the nanoparticles into nanostructured pellets, which retain high‐density twin boundaries and a tuned fraction of the secondary phase Fe‐deficient cubic Cu5FeS4. As a result, the thermal and electrical transport properties are synergistically optimized, leading to an enhanced zT of ≈0.62 at 710 K, which is about 51% higher than that of single‐phase Cu5FeS4. This study provides an energy‐efficient approach to realize twin engineering in nonstoichiometric Cu5FeS4 nanomaterials for high‐performance thermoelectrics. |
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| Keywords: | Cu5FeS4 nanomaterials icosahedron thermoelectrics twin engineering |
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