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Promising bulk nanostructured Cu2Se thermoelectrics via high throughput and rapid chemical synthesis
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0003-0855-5265
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
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2016 (English)In: RSC ADVANCES, ISSN 2046-2069, Vol. 6, no 112, p. 111457-111464Article in journal (Refereed) Published
Abstract [en]

A facile and high yield synthesis route was developed for the fabrication of bulk nanostructured copper selenide (Cu2Se) with high thermoelectric efficiency. Starting from readily available precursor materials and by means of rapid and energy-efficient microwave-assisted thermolysis, nanopowders of Cu2Se were synthesized. Powder samples and compacted pellets have been characterized in detail for their structural, microstructural and transport properties. alpha to beta phase transition of Cu2Se was confirmed using temperature dependent X-ray powder diffraction and differential scanning calorimetry analyses. Scanning electron microscopy analysis reveals the presence of secondary globular nanostructures in the order of 200 nm consisting of <50 nm primary particles. High resolution transmission electron microscopy analysis confirmed the highly crystalline nature of the primary particles with irregular truncated morphology. Through a detailed investigation of different parameters in the compaction process, such as applied load, heating rate, and cooling profiles, pellets with preserved nanostructured grains were obtained. An applied load during the controlled cooling profile was demonstrated to have a big impact on the final thermoelectric efficiency of the consolidated pellets. A very high thermoelectric figure of merit (ZT) above 2 was obtained at 900 K for SPS-compacted Cu2Se nanopowders in the absence of the applied load during the controlled cooling step. The obtained ZT exceeds the state of the art in the temperature ranges above phase transition, approaching up to 25% improvement at 900 K. The results demonstrate the prominent improvement in ZT attributed both to the low thermal conductivity, as low as 0.38 W m(-1) K-1 at 900 K, and the enhancement in the power factor of nanostructured Cu2Se. The proposed synthesis scheme as well as the consolidation could lead to reliable production of large scale thermoelectric nanopowders for niche applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 6, no 112, p. 111457-111464
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-200061DOI: 10.1039/c6ra23005aISI: 000389463600112Scopus ID: 2-s2.0-84999274182OAI: oai:DiVA.org:kth-200061DiVA, id: diva2:1068696
Funder
Swedish Foundation for Strategic Research , EM11-0002Swedish Research Council, VR-SRL 2013-6780
Note

QC 20170126

Available from: 2017-01-26 Created: 2017-01-20 Last updated: 2017-01-26Bibliographically approved

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Yakhshi Tafti, MohsenSaleemi, MohsinToprak, Muhammet S.

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Yakhshi Tafti, MohsenKhachatourian, Adrine MalekNoroozi, MohammadSaleemi, MohsinToprak, Muhammet S.
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