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Structure and thermoelectric properties of 2D Cr2Se3−3xS3x solid solutions

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Abstract

Chromium selenide (Cr2Se3), consisting of earth-abundant elements, is a new cost-efficient thermoelectric material. In this study, a series of Cr2Se3−3xS3x (x = 0–0.1) solid solutions was synthesized by solid-state reaction combined with the spark plasma sintering (SPS) process. The correlation between sulphur substituted on selenium sites, the structure, and the thermoelectric properties of Cr2Se3−3xS3x solid solutions was systematically investigated. The solubility limit of S in Cr2Se3−3xS3x is about 10%. Through S substitutions, the band gap has been widened, the Seebeck coefficient has been effectively increased, and the lattice thermal conductivity has been substantially decreased. Mainly due to the remarkable decrease in the lattice thermal conductivity, the ZT values of Cr2Se3−3xS3x (x = 0–0.1) solid solutions have been increased. The maximum ZT value of 0.29 has been achieved at 623 K for the Cr2Se2.7S0.3 compound, which is 32% higher than the ZT value of pure Cr2Se3.

Graphical abstract: Structure and thermoelectric properties of 2D Cr2Se3−3xS3x solid solutions

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Publication details

The article was received on 18 Oct 2017, accepted on 28 Dec 2017 and first published on 29 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04749E
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Structure and thermoelectric properties of 2D Cr2Se3−3xS3x solid solutions

    T. Zhang, X. Su, Y. Yan, W. Liu, Y. You, H. Xie, D. Yang, C. Uher and X. Tang, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04749E

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