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SnSe + Ag_2Se composite engineering with ball milling for enhanced thermoelectric performance

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Feng Dan 1,2   Chen Yuexing 3,4   Fu Liangwei 2,2   Li Ju 1,5   He Jiaqing 2 *  
文摘 Earth-abundant IV-VI semiconductor SnSe is regarded as a promising thermoelectric material due to its intrinsic low thermal conductivity. In this report, the highly textured SnSe/Ag_2Se composites were first designed by solid solution method followed by spark plasma sintering (SPS) and their thermoelectric properties in two directions were investigated, and then, the performance of composites was further optimized with an additional ball milling. The coexistence of SnSe and Ag_2Se phases is clearly confirmed by energy-dispersive X-ray spectroscopy (EDX) in transmission electron microscopy (TEM). After ball milling, the size of SnSe grains as well as the incorporated Ag_2Se particles reduces effectively, which synergistically optimizes the electrical and thermal transport properties at high temperature range. As a result, a maximum ZT of ~0.74 at 773 K for SnSe + 1.0%Ag_2Se in the direction vertical to the pressing direction is achieved. Composite engineering with additional ball milling is thus proved to be an efficient way to improve the thermoelectric properties of SnSe, and this strategy could be applicable to other thermoelectric systems.
来源 Rare Metals ,2018,37(4):333-342 【核心库】
DOI 10.1007/s12598-017-0994-6
关键词 Thermoelectrics ; SnSe ; Composite engineering ; Ball milling
地址

1. Xi'an Jiaotong University, State Key Laboratory for Mechanical Behavior of Materials and Frontier Institute of Science and Technology, Xi'an, 710049  

2. Department of Physics, South University of Science and Technology of China, Shenzhen Key Laboratory of Thermoelectric Materials, Shenzhen, 518055  

3. Wuhan University and School of Physics and Technology, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan, 430072  

4. Wuhan University, Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology, Wuhan, 430072  

5. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, USA, Cambridge, 02139

语种 英文
文献类型 研究性论文
ISSN 1001-0521
学科 冶金工业
基金 美国国家科学基金 ;  广东省自然科学基金 ;  the Leading Talents of Guangdong Province Program ;  the Science,Technology and Innovation Commission of Shenzhen Municipality ;  国家自然科学基金
文献收藏号 CSCD:6218439

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