Solvothermal synthesis of high-purity porous Cu1.7Se approaching low lattice thermal conductivity

Liu, Wei-Di and Shi, Xiao-Lei ORCID: https://orcid.org/0000-0003-0905-2547 and Moshwan, Raza and Yang, Lei and Chen, Zhi-Gang and Zou, Jin (2019) Solvothermal synthesis of high-purity porous Cu1.7Se approaching low lattice thermal conductivity. Chemical Engineering Journal, 375 (Article 121996). ISSN 1385-8947


Abstract

Superionic Cu2−xSe has attracted extensive research interest as a promising thermoelectric material with low lattice thermal conductivity (~0.6Wm−1 K−1 at 773 K) and high figure of merit, zT. Here, we demonstrated that β-Cu2−xSe can be synthesized via a facile solvothermal method. By modifying the Cu/Se ratio to control the reaction kinetic condition, impurities, such as Cu2O, Cu and Cu3Se2, can be suspended and in turn lead to highpurity Cu1.7Se. After spark plasma sintering (SPS), porous Cu1.7Se pellet can be sintered and has a relatively low lattice thermal conductivity of ~0.24Wm−1 K−1 at 773 K. From the single parabolic band prediction, a high zT of ~1.6 at 773 K could be realized if the carrier concentration, nH, can be optimized to ~1×1020 cm−3 at the same low lattice thermal conductivity. Our study indicates that porous Cu1.7Se is promising to achieve high zT with proper nH-optimization.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
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: 03 Mar 2020 05:30
Last Modified: 13 Mar 2020 06:39
Uncontrolled Keywords: Cu2−xSe, solvothermal synthesis, thermoelectric, lattice thermal conductivity
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1016/j.cej.2019.121996
URI: http://eprints.usq.edu.au/id/eprint/37935

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