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Title: Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites

Abstract

Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric devices. However, the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so far. Herein, we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride (BiSbTe) thermoelectric nanocomposites fabricated from solution-synthesized nanoplates. The figure of merit can reach 1.18, which, however, can be overestimated to 1.88 without considering the inhomogeneity. Our study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity, textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy characterizations. This finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

Authors:
 [1]; ORCiD logo [2];  [3];  [1];  [4];  [1];  [1];  [5];  [4];  [3];  [6];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  3. Univ. of Notre Dame, IN (United States)
  4. Northwestern Univ., Evanston, IL (United States)
  5. Univ. of Cincinnati, OH (United States)
  6. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1593688
Report Number(s):
NREL/JA-5500-75854
Journal ID: ISSN 1998-0124
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Nano Research
Additional Journal Information:
Journal Name: Nano Research; Journal ID: ISSN 1998-0124
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; bismuth antimony telluride; solution synthesis; thermoelectrics; inhomogeneity

Citation Formats

Shi, Enzheng, Cui, Shuang, Kempf, Nicholas, Xing, Qingfeng, Chasapis, Thomas, Zhu, Huazhang, Li, Zhe, Bahk, Je-Hyeong, Snyder, G. Jeffrey, Zhang, Yanliang, Chen, Renkun, and Wu, Yue. Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites. United States: N. p., 2019. Web. doi:10.1007/s12274-019-2590-6.
Shi, Enzheng, Cui, Shuang, Kempf, Nicholas, Xing, Qingfeng, Chasapis, Thomas, Zhu, Huazhang, Li, Zhe, Bahk, Je-Hyeong, Snyder, G. Jeffrey, Zhang, Yanliang, Chen, Renkun, & Wu, Yue. Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites. United States. doi:10.1007/s12274-019-2590-6.
Shi, Enzheng, Cui, Shuang, Kempf, Nicholas, Xing, Qingfeng, Chasapis, Thomas, Zhu, Huazhang, Li, Zhe, Bahk, Je-Hyeong, Snyder, G. Jeffrey, Zhang, Yanliang, Chen, Renkun, and Wu, Yue. Wed . "Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites". United States. doi:10.1007/s12274-019-2590-6.
@article{osti_1593688,
title = {Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites},
author = {Shi, Enzheng and Cui, Shuang and Kempf, Nicholas and Xing, Qingfeng and Chasapis, Thomas and Zhu, Huazhang and Li, Zhe and Bahk, Je-Hyeong and Snyder, G. Jeffrey and Zhang, Yanliang and Chen, Renkun and Wu, Yue},
abstractNote = {Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric devices. However, the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so far. Herein, we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride (BiSbTe) thermoelectric nanocomposites fabricated from solution-synthesized nanoplates. The figure of merit can reach 1.18, which, however, can be overestimated to 1.88 without considering the inhomogeneity. Our study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity, textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy characterizations. This finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.},
doi = {10.1007/s12274-019-2590-6},
journal = {Nano Research},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {12}
}

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