Huang, L., Han, G., Zhang, B. and Gregory, D. (2019) Anion-exchange synthesis of thermoelectric layered SnS0.1Se0.9-xTex nano/microstructures in aqueous solution; complexity and carrier concentration. Journal of Materials Chemistry C, 7, pp. 7572-7529. (doi: 10.1039/C9TC01994D)
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Abstract
Nanostructured SnS0.1Se0.9-xTex (x = 0.02, 0.05, 0.08) quaternary chalcogenides have been controllably synthesised via a facile solution-processable anion-exchange method. All the products exist as “flower-like” architectures assembled from individual nano/microplates that are each hundreds of nanometers in thickness and several micrometers in lateral size. This morphology is essentially preserved from the original SnS starting material. Spark plasma sintering (SPS) not only consolidates the as-prepared powder samples, but also eliminates secondary phases, leading to pellets of phase-pure SnS0.1Se0.9-xTex solid solution members. The electrical conductivity of SnS0.1Se0.88Te0.02 is significantly enhanced over the Te-free material in the low-temperature range, achieving a peak value of ≈5760 S m-1 at 373 K, which is ≈41% higher than SnS0.1Se0.9 at the same temperature. Also possessing a high Seebeck coefficient, SnS0.1Se0.88Te0.02 exhibits a maximum power factor (ca. 0.54 mW m-1 K-2) at 423 K. The thermoelectric performance of SnS0.1Se0.9-xTex has been optimised through modifying the Te concentration, leading to a peak ZT of ≈0.43 for SnS0.1Se0.88Te0.02 at 773 K. This robust, scalable and surfactant-free approach paves the way to engineer increasingly complex (in this case, quaternary) metal chalcogenides controllably in aqueous solution.
| Item Type: | Articles |
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| Additional Information: | This work was financially supported by the National Natural Science Foundation of China (No. 51802034), the Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2018jcyjAX0346), the Chongqing Entrepreneurship and Innovation Program for the Returned Overseas Chinese Scholars (No. cx2018020), the Fundamental Research Funds for the Central Universities (No. 2019CDQYCL003), and the Research Funds from Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University (LLEUTS-201802). |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Gregory, Professor Duncan |
| Authors: | Huang, L., Han, G., Zhang, B., and Gregory, D. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Journal of Materials Chemistry C |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 2050-7526 |
| ISSN (Online): | 2050-7534 |
| Published Online: | 23 May 2019 |
| Copyright Holders: | Copyright © 2019 The Royal Society of Chemistry |
| First Published: | First published in Journal of Materials Chemistry C 7:7572-7579 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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