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Issue 5, 2012
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Polycrystalline BiCuSeO oxide as a potential thermoelectric material

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Abstract

This work revealed that BiCuSeO oxyselenide is a potential oxide-based thermoelectric material, whose dimensionless figure of merit (ZT) reaches ∼0.70 at 773 K. High phase-purity BiCuSeO polycrystalline materials with fine grains were synthesized by a facile method combining a solid-state reaction and spark plasma sintering. Purifying the constitutive phase and reducing the grain sizes by introducing a high-energy ball milling process before spark plasma sintering were found to be effective in property enhancement. The resultant single-phased BiCuSeO sample derived from ball-milled powders shows good electrical conductivity above 4.0 × 103 S m−1 and a large Seebeck coefficient above 200 μV K−1. This compound has a low thermal conductivity (∼0.5 W m−1 K−1), which is associated with its low phonon transport speed and Young's modulus. Results indicated that BiCuSeO-based materials are promising for energy conversion applications in the moderate temperature range.

Graphical abstract: Polycrystalline BiCuSeO oxide as a potential thermoelectric material

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Publication details

The article was received on 03 Feb 2012, accepted on 19 Mar 2012 and first published on 20 Mar 2012


Article type: Paper
DOI: 10.1039/C2EE21274A
Citation: Energy Environ. Sci., 2012,5, 7188-7195
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    Polycrystalline BiCuSeO oxide as a potential thermoelectric material

    F. Li, J. Li, L. Zhao, K. Xiang, Y. Liu, B. Zhang, Y. Lin, C. Nan and H. Zhu, Energy Environ. Sci., 2012, 5, 7188
    DOI: 10.1039/C2EE21274A

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