Enhancing thermoelectric performance of Solution-Processed polycrystalline SnSe with PbSe nanocrystals
Liu, Yu (Institute of Science and Technology Austria)
Lee, Seungho (Institute of Science and Technology Austria)
Fiedler, Christine (Institute of Science and Technology Austria)
Spadaro, Maria Chiara (Institut Català de Nanociència i Nanotecnologia)
Chang, Cheng (Beihang University. School of Materials Science and Engineering)
Li, Mingquan (Hefei University of Technology)
Hong, Min (University of Southern Queensland)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Ibáñez, Maria (Institute of Science and Technology Austria)

Fecha:	2024
Resumen:	There is a growing interest in cost-effective polycrystalline SnSe-based thermoelectric (TE) materials, which are able to replace the high performance but mechanically fragile and costly single-crystalline SnSe. In this study, we present a low-temperature solution-based approach to produce SnSe-PbSe nanocomposites with outstanding TE performance. Our method involves combining surfactant-free SnSe particles with oleate-capped PbSe nanocrystals in specific ratios, followed by thermal annealing and consolidation using spark plasma sintering. These nanocomposites are characterized by distinct compositional and structural properties that significantly impact their transport properties. In particular, the addition of oleate-capped PbSe nanocrystals results in: i) a reduction in the electrostatically adsorbed Na at the surface of the SnSe particles; ii) a reduction of Sn vacancies due to alloying with Pb; iii) an increase in grain boundary density; and iv) the formation of PbSnSe secondary phases. Notably, the SnSe-2. 5 %PbSe nanocomposites demonstrate a 30 % decrease in thermal conductivity compared to that of the SnSe matrix. This reduction contributes to a maximum figure of merit (zT) of 1. 75 at 788 K with a high average zT value of ca. 1. 2 in the medium temperature range of 573-773 K. These values represent one of the highest reported in polycrystalline SnSe materials, showcasing the potential of our fabricated SnSe-PbSe nanocomposites for cost-effective TE applications.
Ayudas:	Agencia Estatal de Investigación PID2020-116093RB-C43 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agencia Estatal de Investigación CEX2021-001214-S
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Tin selenide ; Nanocomposites ; Solution processing ; Thermoelectricity ; Thermal conductivity
Publicado en:	Chemical Engineering Journal, Vol. 490 (June 2024) , art. 151405, ISSN 1385-8947

DOI: 10.1016/j.cej.2024.151405

9 p, 1.1 MB

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