Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201705117
Keywords
Cu5FeS4; nanomaterials; icosahedron; thermoelectrics; twin engineering
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Funding
- National Natural Science Foundation of China [11344010, 11404044, 51472036]
- Fundamental Research Funds for the Central Universities of China [106112016CDJZR308808, 0903005203541]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH016]
- Project for Fundamental and Frontier Research in Chongqing [CSTC2015JCYJBX0026]
- Hong Kong GRF [B-Q55T]
- PolyU [G-YBFT, 1-BBAF]
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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 approximate to 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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