Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 15, Pages 17864-17872Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01229
Keywords
nanostructure engineering; dislocation; magnetic gamma-Fe2O3; tetrahedrite; thermoelectric
Funding
- National Key R&D Program of China [2018YFB0703603]
- Basic Science Center Project of NSFC [51788104]
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Nanostructuring and defect engineering are increasingly employed as processing strategies for thermoelectric performance enhancement, and special attention has been paid to nanostructured interfaces and dislocations that can effectively scatter low- and mid-frequency phonons. This work demonstrated that their combination was realized in Fe2O3-dispersed tetrahedrite (Cu12Sb4S13) nanocomposites, leading to significantly reduced thermal conductivities around 0.9 W m(-1) K-1 at all temperatures and hence a high ZT value of similar to 1.0, which increases by similar to 33% compared with that of the matrix. The plausible enhancement mechanisms have been analyzed with an emphasis on the incorporation of magnetic gamma-Fe2O3 nanoparticles (NPs) into Cu11.5Ni0.5Sb4S13, leading to various nanostructures (NPs, nanoprecipitates, and nanotwins) and dislocations. A calculated efficiency of similar to 9.3% and an average ZT of 0.63 also reveal the potential application of tetrahedrite at medium temperatures. Additionally, the mechanical properties are improved because of a second phase strengthening and nanotwin structures.
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