Nanostructure Engineering and Performance Enhancement in Fe2O3-Dispersed Cu12Sb4S13 Thermoelectric Composites with Earth-Abundant Elements

被引：31

作者：

Hu, Haihua ^{[1
]}

Sun, Fu-Hua ^{[1
]}

Dong, Jinfeng ^{[1
]}

Zhuang, Hua-Lu ^{[1
]}

Cai, Bowen ^{[1
]}

Pei, Jun ^{[1
]}

Li, Jing-Feng ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 15期

基金：

国家重点研发计划;

关键词：

nanostructure engineering; dislocation; magnetic gamma-Fe2O3; tetrahedrite; thermoelectric; LATTICE THERMAL-CONDUCTIVITY; TETRAHEDRITE; STABILITY; NICKEL; NI; SCATTERING; FIGURE; POWER;

D O I：

10.1021/acsami.0c01229

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：17864 / 17872

页数：9

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