High efficient nanostructured PbSe0. 5Te0. 5 exhibiting broad figure-of-merit plateau

Article


Nandihalli, Nandihalli, Wijethunge, Dimuthu, Kim, Kyomin, Kim, Jiyong and Gayner, Chhatrasal. 2019. "High efficient nanostructured PbSe0. 5Te0. 5 exhibiting broad figure-of-merit plateau." Journal of Alloys and Compounds. 785, pp. 862-870. https://doi.org/10.1016/j.jallcom.2019.01.105
Article Title

High efficient nanostructured PbSe0. 5Te0. 5 exhibiting broad figure-of-merit plateau

ERA Journal ID1448
Article CategoryArticle
AuthorsNandihalli, Nandihalli, Wijethunge, Dimuthu, Kim, Kyomin, Kim, Jiyong and Gayner, Chhatrasal
Journal TitleJournal of Alloys and Compounds
Journal Citation785, pp. 862-870
Number of Pages9
Year2019
PublisherElsevier
Place of PublicationNetherlands
ISSN0925-8388
1873-4669
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jallcom.2019.01.105
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0925838819301136
Abstract

To have a very good energy conversion efficiency, thermoelectric (TE) material should exhibit higher figure-of-merit (ZT) for broad range of temperatures. In that direction, n-type PbTe0.5Se0.5 material with enhanced and temperature insensitive figure-of-merit was developed through nanostructured approach. A temperature insensitive ZT of 0.7 was observed from 400 K to 600 K. The enhanced and stable ZT over a wide temperature range was ascribed to the presence of various types of nanostructures that facilitated scattering of mid and long wavelength phonons, keeping the thermal conductivity low in addition to scattering low energy charge carriers elevating the Seebeck coefficient (−380 μVK−1 at 600 K). Most thermoelectric n-type materials such as PbQ (Q = Te, Se) materials exhibits very low ZT at room temperature which hampers the overall conversation efficiency. However, the developed material exhibits highest ZT at room temperature among PbQ (Q = Te,Se) materials that enables this material to be used in wearable thermoelectric applications. In this study, newly introduced technique was adopted to calculate TE conversion efficiency, which addresses overestimations of conventional efficiency calculations. The developed material showed power generation efficiency higher than many state-of-the-art TE n-type materials in 300 K–600 K range making it a competitive material for waste heat recovery applications.

KeywordsWaste heat recovery; Lead selenides; TE power generation efficiency; Nanoprecipitates; Sustainable energy; Engineering figure-of-merit
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401607. Metals and alloy materials
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