Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/159050
Title: Local nanostructures enhanced the thermoelectric performance of n-PbTe
Authors: Xiang, Bo
Liu, Jiaqin
Yan, Jian
Xia, Minggang
Zhang, Qi
Chen, Lingxue
Li, Jiayong
Tan, Xian Yi
Yan, Qingyu
Wu, Yucheng
Keywords: Engineering::Materials::Functional materials
Issue Date: 2019
Source: Xiang, B., Liu, J., Yan, J., Xia, M., Zhang, Q., Chen, L., Li, J., Tan, X. Y., Yan, Q. & Wu, Y. (2019). Local nanostructures enhanced the thermoelectric performance of n-PbTe. Journal of Materials Chemistry A, 7(31), 18458-18467. https://dx.doi.org/10.1039/C9TA06247E
Project: MOE 2018-T2-1-010 
SERC 1527200022 
Journal: Journal of Materials Chemistry A 
Abstract: Microstructure controlling and carrier concentration engineering are effective approaches to optimize thermal transport and electrical properties in thermoelectric materials. Hereby, we have developed a facile strategy to reduce the lattice thermal conductivity separately by creating locally nanostructured PbTe with controlled size in micro-sized PbTe frame. This is realized by using building blocks of PbTe nanocubes and PbTe@C:Ag nanoparticles with carbon shell as diffusion barrier to prevent grain growth during spark plasma sintering (SPS), while uncoated PbTe nanocubes grow to the micro-sized frame. The locally nano-structured PbTe/PbTe@C:Ag successfully integrates multiple defects that involve Ag based nano-precipitates, nano/micro-sized grain boundaries/interfaces, pores and other defects. They collectively scatter phonons in low-middle frequencies to reduce lattice thermal conductivity significantly in low-temperature range. In addition, Ag exhibits dynamic doping behavior due to more interstitial Ag in PbTe lattice at elevated temperature. This could further enhance the high-frequency phonons scattering and suppress bipolar effect in high-temperature range, leading to an ultralow lattice thermal conductivity of 0.39 W m-1 K-1 at 723 K. On the other hand, the micro-sized PbTe frame with Ag nanoparticles at boundaries maintains relatively high carrier mobility. Further considering the higher carrier concentration due to Ag dynamic doping at elevated temperature, a high power factor of 20.4 μW cm-1 K-2 has been achieved at 723 K. Consequently, a peak figure of merit of 1.65 was achieved at 723K in PbTe/7%PbTe@C:Ag. Our strategy shows superiority in constructing desired nano-, microstructures and tuneable carrier concentration of PbTe towards high thermoelectric performance.
URI: https://hdl.handle.net/10356/159050
ISSN: 2050-7488
DOI: 10.1039/C9TA06247E
Schools: School of Materials Science and Engineering 
Rights: © 2019 The Royal Society of Chemistry. All rights reserved. This paper was published in Journal of Materials Chemistry A and is made available with permission of The Royal Society of Chemistry.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

Files in This Item:
File Description SizeFormat 
Local nanostructures enhanced the thermoelectric performance of n-PbTe.pdf2.28 MBAdobe PDFThumbnail
View/Open

SCOPUSTM   
Citations 10

48
Updated on Apr 7, 2024

Web of ScienceTM
Citations 10

41
Updated on Oct 27, 2023

Page view(s)

155
Updated on Apr 18, 2024

Download(s) 50

120
Updated on Apr 18, 2024

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.