High-efficiency half-Heusler thermoelectric modules enabled by self-propagating synthesis and topologic structure optimization

Combining high thermoelectric (TE) performance, excellent mechanical properties, and good thermal stability, half-Heusler materials show great potential in real applications, such as industrial waste heat recovery. However, the materials synthesis technology developed in the laboratory scale environ...

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Bibliographic Details
Published in:Energy & environmental science 2019-01, Vol.12 (11), p.339-3399
Main Authors: Xing, Yunfei, Liu, Ruiheng, Liao, Jinchen, Zhang, Qihao, Xia, Xugui, Wang, Chao, Huang, Hui, Chu, Jing, Gu, Ming, Zhu, Tiejun, Zhu, Chenxi, Xu, Fangfang, Yao, Dongxu, Zeng, Yuping, Bai, Shengqiang, Uher, Ctirad, Chen, Lidong
Format: Article
Language:English
Subjects:
Bismuth tellurides
Dislocation
Dislocation density
Electric power generation
Fabrication
Finite element method
Heat recovery
Heusler alloys
Industrial wastes
Laboratories
Materials recovery
Mechanical properties
Modules
Optimization
Self propagating high temperature synthesis
Thermal conductivity
Thermal stability
Thermoelectricity
Three dimensional models
Waste heat recovery
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Summary:Combining high thermoelectric (TE) performance, excellent mechanical properties, and good thermal stability, half-Heusler materials show great potential in real applications, such as industrial waste heat recovery. However, the materials synthesis technology developed in the laboratory scale environment cannot fulfil the requirements of massive device fabrication. In this work, a batch synthesis utilizing the self-propagating high-temperature synthesis (SHS) method was used to prepare state-of-the-art n-type Zr 0.5 Hf 0.5 NiSn 0.985 Sb 0.015 and p-type Zr 0.5 Hf 0.5 CoSb 0.8 Sn 0.2 half-Heusler alloys. Due to the nonequilibrium reaction process, dense dislocation arrays were introduced in both n-type and p-type materials, which greatly depressed the lattice thermal conductivity. As a consequence, the zT values of samples cut from ingots weighing a few hundreds of grams compared favorably with those prepared from few gram laboratory size pellets. Based on the high TE performance, a three-dimensional finite element model encompassing all relevant parameters was applied to optimize the topological structures of both a half-Heusler single-stage module and a half-Heusler/Bi 2 Te 3 segmented module. The optimized modules attained record-high conversion efficiencies of 9.6% and 12.4% for the single-stage and the segmented module, respectively. The work documents a comprehensive processing of novel TE materials culminating in the assembly of efficient TE modules. As such, it paves the way for widespread commercial applications of TE power generation. Combined high performance of self-propagating synthesized materials and topological structures optimization, half-Heusler single-stage module and half-Heusler/Bi 2 Te 3 segmented module attained record-high conversion efficiencies of 9.6% and 12.4%.
ISSN:1754-5692
1754-5706
DOI:10.1039/c9ee02228g