CaltechAUTHORS
  A Caltech Library Service

Mechanically Robust BiSbTe Alloys with Superior Thermoelectric Performance: A Case Study of Stable Hierarchical Nanostructured Thermoelectric Materials

Zheng, Yun and Zhang, Qiang and Su, Xianli and Xie, Hongyao and Shu, Shengcheng and Chen, Tianle and Tan, Gangjian and Yan, Yonggao and Tang, Xinfeng and Uher, Ctirad and Snyder, G. Jeffrey (2015) Mechanically Robust BiSbTe Alloys with Superior Thermoelectric Performance: A Case Study of Stable Hierarchical Nanostructured Thermoelectric Materials. Advanced Energy Materials, 5 (5). Art. No. 1401391. ISSN 1614-6832. http://resolver.caltech.edu/CaltechAUTHORS:20150406-140426240

[img] PDF - Supplemental Material
See Usage Policy.

2139Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150406-140426240

Abstract

Bismuth telluride based thermoelectric materials have been commercialized for a wide range of applications in power generation and refrigeration. However, the poor machinability and susceptibility to brittle fracturing of commercial ingots often impose significant limitations on the manufacturing process and durability of thermoelectric devices. In this study, melt spinning combined with a plasma-activated sintering (MS-PAS) method is employed for commercial p-type zone-melted (ZM) ingots of Bi_0.5Sb_1.5Te_3. This fast synthesis approach achieves hierarchical structures and in-situ nanoscale precipitates, resulting in the simultaneous improvement of the thermoelectric performance and the mechanical properties. Benefitting from a strong suppression of the lattice thermal conductivity, a peak ZT of 1.22 is achieved at 340 K in MS-PAS synthesized structures, representing about a 40% enhancement over that of ZM ingots. Moreover, MS-PAS specimens with hierarchical structures exhibit superior machinability and mechanical properties with an almost 30% enhancement in their fracture toughness, combined with an eightfold and a factor of six increase in the compressive and flexural strength, respectively. Accompanied by an excellent thermal stability up to 200 °C for the MS-PAS synthesized samples, the MS-PAS technique demonstrates great potential for mass production and large-scale applications of Bi_2Te_3 related thermoelectrics.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/aenm.201401391DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201401391/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201401391/suppinfoPublisherSupporting Information
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Received: August 12, 2014; Revised: October 10, 2014; Published online: November 14, 2014. The authors thank Rong Jiang and Tingting Luo for help with the HRTEM analysis. This work is financially supported by the National Basic Research Program of China (973 program) under project 2013CB632502, the International Science & Technology Cooperation Program of China (Grant No. 2011DFB60150), the Natural Science Foundation of China (Grant No. 51402222, 51172174) and the 111 Project of China (Grant No. B07040).
Funders:
Funding AgencyGrant Number
National Basic Research Program of China2013CB632502
International Science & Technology Cooperation Program of China2011DFB60150
Natural Science Foundation of China51402222
Natural Science Foundation of China51172174
111 Project of ChinaB07040
Subject Keywords:hierarchical structures; thermoelectric materials; alloys; nanostructures
Record Number:CaltechAUTHORS:20150406-140426240
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150406-140426240
Official Citation:Zheng Y., Zhang Q., Su X., Xie H., Shu S., Chen T., Tan G., Yan Y., Tang X., Uher C., Snyder G. J. (2015). Mechanically Robust BiSbTe Alloys with Superior Thermoelectric Performance: A Case Study of Stable Hierarchical Nanostructured Thermoelectric Materials. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401391
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56386
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:07 Apr 2015 23:23
Last Modified:07 Apr 2015 23:23

Repository Staff Only: item control page