High porosity in nanostructured n‑type Bi2Te3 obtaining ultralow lattice thermal conductivity

Wang, Yuan and Liu, Wei-Di and Gao, Han and Wang, Li-Jun and Li, Meng and Shi, Xiao-Lei and Hong, Min and Wang, Hao and Zou, Jin and Chen, Zhi-Gang (2019) High porosity in nanostructured n‑type Bi2Te3 obtaining ultralow lattice thermal conductivity. ACS Applied Materials and Interfaces, 11. pp. 31237-31244. ISSN 1944-8244

Abstract

Porous structure possesses full potentials to develop high-performance thermoelectric materials with low lattice thermal conductivity. In this study, the ntype porous nanostructured Bi2Te3 pellet is fabricated by sintering Bi2Te3 nanoplates synthesized with a facile solvothermal method. With adequate sublimations of Bi2TeO5 during the spark plasma sintering, homogeneously distributed pores and dense grain boundaries are successfully introduced into the Bi2Te3 matrix, causing strong phonon scatterings, from which an ultralow lattice thermal conductivity of <0.1 W m−1 K−1 is achieved in the porous nanostructured Bi2Te3 pellet. With the well-maintained decent electrical performance, a power factor of 10.57 μW cm−1 K−2 at 420 K, as well as the reduced lattice thermal conductivity, secured a promising zT value of 0.97 at 420 K, which is among the highest values reported for pure n-type Bi2Te3. This study provides the insight of realizing ultralow lattice thermal conductivity by synergistic phonon scatterings of pores and nanostructure in the ntype Bi2Te3-based thermoelectric materials.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 11 Sep 2019 05:45
Last Modified: 12 Sep 2019 04:49
Uncontrolled Keywords: thermoelectrics, bismuth telluride, porous, nanostructure, lattice thermal conductivity
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1021/acsami.9b12079
URI: http://eprints.usq.edu.au/id/eprint/36998

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