Thermoelectric properties of Bi0.5Sb1.5Te3/Ag2Te bulk composites with size- and shape-controlled Ag2Te nano-particles dispersion

被引：24

作者：

Lee, Min Ho ^{[1
,2
]}

Rhyee, Jong-Soo ^{[1
,2
]}

Kim, Seil ^{[3
]}

Choa, Yong-Ho ^{[3
]}

机构：

[1] Kyung Hee Univ, Dept Appl Phys, Yongin 17104, South Korea

[2] Kyung Hee Univ, Inst Nat Sci, Yongin 17104, South Korea

[3] Hanyang Univ, Dept Fus Chem Engn, Ansan 15588, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 657卷

基金：

新加坡国家研究基金会;

关键词：

Thermoelectric; Nano particle dispersion; Composite; Ag2Te; TOPOLOGICAL INSULATOR; PERFORMANCE;

D O I：

10.1016/j.jallcom.2015.10.160

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigated the particle size-dependent thermoelectric properties of conventional p-type Bi0.5Sb1.5Te3 compounds (L-large, M-medium, S-small sizes) and M-Bi0.5Sb1.5Te3/Ag2Te composites with commercial (C), nano-wire (NW), and nano-powder (NP) type Ag2Te nano materials. The sintered ingot with the medium size particles M-Bi0.5Sb1.5Te3 shows a high power factor of S-2 sigma, due to its high electrical conductivity and Seebeck coefficient, with a maximum ZT (0.9 at 300 K). The S-Bi0.5Sb1.5Te3, synthesized by the wet-chemical method, exhibits the lowest thermal conductivity by grain boundary phonon scattering. The composites of M-Bi0.5Sb1.5Te3/Ag2Te show significantly enhanced electrical conductivities, as well as a decrease of lattice thermal conductivities, resulting in the enhancement of ZT (1.1 at 575 K) for a NP-Ag2Te dispersed M-Bi0.5Sb1.5Te3/NP-Ag2Te composite. Here, we propose that the Bi0.5Sb1.5Te3/Ag2Te composite can be employed as a material for waste heat power generation. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：639 / 645

页数：7

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