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
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
收藏
页码:639 / 645
页数:7
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