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Nanoporous PbSe–SiO(2) Thermoelectric Composites

Nanoporous architecture has long been predicted theoretically for its proficiency in suppressing thermal conduction, but less concerned as a practical approach for better thermoelectric materials hitherto probably due to its technical challenges. This article demonstrates a study on nanoporous PbSe–...

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Autores principales: Wu, Chao‐Feng, Wei, Tian‐Ran, Sun, Fu‐Hua, Li, Jing‐Feng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5700627/
https://www.ncbi.nlm.nih.gov/pubmed/29201615
http://dx.doi.org/10.1002/advs.201700199
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author Wu, Chao‐Feng
Wei, Tian‐Ran
Sun, Fu‐Hua
Li, Jing‐Feng
author_facet Wu, Chao‐Feng
Wei, Tian‐Ran
Sun, Fu‐Hua
Li, Jing‐Feng
author_sort Wu, Chao‐Feng
collection PubMed
description Nanoporous architecture has long been predicted theoretically for its proficiency in suppressing thermal conduction, but less concerned as a practical approach for better thermoelectric materials hitherto probably due to its technical challenges. This article demonstrates a study on nanoporous PbSe–SiO(2) composites fabricated by a facile method of mechanical alloying assisted by subsequent wet‐milling and then spark plasma sintering. Owing to the formation of random nanopores and additional interface scattering, the lattice thermal conductivity is limited to a value as low as 0.56 W m(−1) K(−1) at above 600 K, almost the same low level achieved by introducing nanoscale precipitates. Besides, the room‐temperature electrical transport is found to be dominated by the grain‐boundary potential barrier scattering, whose effect fades away with increasing temperatures. Consequently, a maximum ZT of 1.15 at 823 K is achieved in the PbSe + 0.7 vol% SiO(2) composition with >20% increase in average ZT, indicating the great potential of nanoporous structuring toward high thermoelectric conversion efficiency.
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spelling pubmed-57006272017-11-30 Nanoporous PbSe–SiO(2) Thermoelectric Composites Wu, Chao‐Feng Wei, Tian‐Ran Sun, Fu‐Hua Li, Jing‐Feng Adv Sci (Weinh) Full Papers Nanoporous architecture has long been predicted theoretically for its proficiency in suppressing thermal conduction, but less concerned as a practical approach for better thermoelectric materials hitherto probably due to its technical challenges. This article demonstrates a study on nanoporous PbSe–SiO(2) composites fabricated by a facile method of mechanical alloying assisted by subsequent wet‐milling and then spark plasma sintering. Owing to the formation of random nanopores and additional interface scattering, the lattice thermal conductivity is limited to a value as low as 0.56 W m(−1) K(−1) at above 600 K, almost the same low level achieved by introducing nanoscale precipitates. Besides, the room‐temperature electrical transport is found to be dominated by the grain‐boundary potential barrier scattering, whose effect fades away with increasing temperatures. Consequently, a maximum ZT of 1.15 at 823 K is achieved in the PbSe + 0.7 vol% SiO(2) composition with >20% increase in average ZT, indicating the great potential of nanoporous structuring toward high thermoelectric conversion efficiency. John Wiley and Sons Inc. 2017-08-11 /pmc/articles/PMC5700627/ /pubmed/29201615 http://dx.doi.org/10.1002/advs.201700199 Text en © 2017 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Wu, Chao‐Feng
Wei, Tian‐Ran
Sun, Fu‐Hua
Li, Jing‐Feng
Nanoporous PbSe–SiO(2) Thermoelectric Composites
title Nanoporous PbSe–SiO(2) Thermoelectric Composites
title_full Nanoporous PbSe–SiO(2) Thermoelectric Composites
title_fullStr Nanoporous PbSe–SiO(2) Thermoelectric Composites
title_full_unstemmed Nanoporous PbSe–SiO(2) Thermoelectric Composites
title_short Nanoporous PbSe–SiO(2) Thermoelectric Composites
title_sort nanoporous pbse–sio(2) thermoelectric composites
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5700627/
https://www.ncbi.nlm.nih.gov/pubmed/29201615
http://dx.doi.org/10.1002/advs.201700199
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