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Nanostructure Engineering and Performance Enhancement in Fe2O3‑Dispersed Cu12Sb4S13 Thermoelectric Composites with Earth-Abundant Elements
journal contribution
posted on 2020-03-31, 15:39 authored by Haihua Hu, Fu-Hua Sun, Jinfeng Dong, Hua-Lu Zhuang, Bowen Cai, Jun Pei, Jing-Feng LiNanostructuring
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 ∼1.0, which increases
by ∼33% compared with that of the matrix. The plausible enhancement
mechanisms have been analyzed with an emphasis on the incorporation
of magnetic γ-Fe2O3 nanoparticles (NPs)
into Cu11.5Ni0.5Sb4S13, leading to various nanostructures (NPs, nanoprecipitates, and nanotwins)
and dislocations. A calculated efficiency of ∼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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γ- Fe 2 O 3 nanoparticlesprocessing strategiesEarth-Abundant Elements Nanostructuringmedium temperaturesNanostructure Engineeringmid-frequency phononsZT valuenanotwin structuresdefect engineeringdislocationNPFe 2 O 3nanostructured interfacesenhancement mechanismsPerformance EnhancementCu 12 Sb 4 S 13tetrahedriteperformance enhancementCu 11.5 Ni 0.5 Sb 4 S 13
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