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Synthesis, processing, and thermoelectric properties of bulk nanostructured bismuth telluride (Bi(2)Te(3))
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5380-975X
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5678-5298
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
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2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 2, 725-730 p.Article in journal (Refereed) Published
Abstract [en]

Bismuth telluride (Bi(2)Te(3)) is the best-known commercially used thermoelectric material in the bulk form for cooling and power generation applications at ambient temperature. However, its dimensionless figure-of-merit-ZT around 1 limits the large-scale industrial applications. Recent studies indicate that nanostructuring can enhance ZT while keeping the material form of bulk by employing an advanced synthetic process accompanied with novel consolidation techniques. Here, we report on bulk nanostructured (NS) undoped Bi(2)Te(3) prepared via a promising chemical synthetic route. Spark plasma sintering has been employed for compaction and sintering of Bi(2)Te(3) nanopowders, resulting in very high densification (>97%) while preserving the nanostructure. The average grain size of the final compacts was obtained as 90 +/- 5 nm as calculated from electron micrographs. Evaluation of transport properties showed enhanced Seebeck coefficient (-120 mu V K(-1)) and electrical conductivity compared to the literature state-of-the-art (30% enhanced power factor), especially in the low temperature range. An improved ZT for NS bulk undoped Bi(2)Te(3) is achieved with a peak value of similar to 1.1 at 340 K.

Place, publisher, year, edition, pages
2012. Vol. 22, no 2, 725-730 p.
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-75521DOI: 10.1039/c1jm13880dISI: 000299020000062ScopusID: 2-s2.0-83455224189OAI: diva2:491057
QC 20120206Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2014-09-18Bibliographically approved
In thesis
1. Nano-EngineeredThermoelectric Materials for Waste Heat Recovery
Open this publication in new window or tab >>Nano-EngineeredThermoelectric Materials for Waste Heat Recovery
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Energy crisis and thermal management related issues have been highlighted in the modern century due to escalating demands for energy consumption and global warming from fossil fuels. Sustainable and alternative energy sources are an ever growing global concern. Thermoelectric (TE) materials have gained significant interest, due to effective solid-state energy conversion from waste heat to useful electrical energy and vice versa.   Clean, noise-free, and environment-friendly operation of TE devices has triggered great attention in viable technologies including automotive, military equipment, aerospace, and industries to scavenge waste heat into power. To date, conventional TE materials have shown limited energy conversion efficiency, i.e. TE Figure of Merit (ZT). However, the concept of nanostructuring and development of novel TE materials have opened excellent avenues to improve significantly the ZT values. Nano-engineered bulk TE materials allow effective phonon scattering at the high density of grain boundaries, which offer a way of lowering the thermal conductivity. 

Large-scale synthesis of TE nanomaterials is a challenge for the TE industry because of expensive fabrication processes involved. This thesis reports several nano-engineering approaches for fabricating large quantities of bulk nanostructured TE materials. We have developed bottom-up chemical synthesis routes, as well as top-down mechanical alloying methodologies, to produce highly pure, homogenous and highly crystalline TE nanomaterials. State of the art chalcogenide, iron antimonide, and silicide based TE materials have been investigated in this thesis. Chalcogenide are the best candidates for TE devices operating at temperature range up to 450 K.  Iron antimonide (FeSb2) have shown attractive performance below room temperature. Earth abundant and environment friendly, silicide based materials have better ZT performance in the range of 600-900 K.  Spark plasma sintering (SPS) was utilized to preserve the nanostructuring and to achieve the highest compaction density. Comprehensive physiochemical characterizations were performed on as-prepared and SPS compacted samples. Detailed TE evaluation of the fabricated materials showed significant improvement in ZT for all categories of TE materials.

Place, publisher, year, edition, pages
Stockholm 2014: KTH Royal Institute of Technology, 2014. xi, 52 p.
TRITA-ICT/MAP AVH, ISSN 1653-7610 ; 2014:12
National Category
Materials Chemistry
urn:nbn:se:kth:diva-151363 (URN)978-91-7595-210-9 (ISBN)
Public defence
2014-10-03, SAl B, Electrum 229, Isafajordsgatan 22, Kista, 14:00 (English)
Swedish Energy Agency, 36656-1EU, FP7, Seventh Framework Programme, 263167Swedish Foundation for Strategic Research , EM11-0002EU, FP7, Seventh Framework Programme, 228882

QC 20140918

Available from: 2014-09-18 Created: 2014-09-18 Last updated: 2014-09-18Bibliographically approved

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