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题名: High Performance Thermoelectrics from Earth-Abundant Materials: Enhanced Figure of Merit in PbS by Second Phase Nanostructures
作者: Li Dong Zhao
Shih Han Lo
Jiaqing He
Hao Li
Kanishka Biswas
John Androulakis
Chun I. Wu
Timothy P. Hogan
Duck Young Chung
Vinayak P. Dravid
Mercouri G. Kanatzidis
贡献者: 國立臺灣海洋大學:機械與機電工程學系
日期: 2011-11
上传时间: 2018-09-28T08:28:21Z
出版者: Journal of the American Chemical Society
摘要: Abstract: Lead sulfide, a compound consisting of elements with high natural abundance, can be converted into an excellent thermoelectric material. We report extensive doping studies, which show that the power factor maximum for pure n-type PbS can be raised substantially to ∼12 μW cm–1 K–2 at >723 K using 1.0 mol % PbCl2 as the electron donor dopant. We also report that the lattice thermal conductivity of PbS can be greatly reduced by adding selected metal sulfide phases. The thermal conductivity at 723 K can be reduced by ∼50%, 52%, 30%, and 42% through introduction of up to 5.0 mol % Bi2S3, Sb2S3, SrS, and CaS, respectively. These phases form as nanoscale precipitates in the PbS matrix, as confirmed by transmission electron microscopy (TEM), and the experimental results show that they cause huge phonon scattering. As a consequence of this nanostructuring, ZT values as high as 0.8 and 0.78 at 723 K can be obtained for nominal bulk PbS material. When processed with spark plasma sintering, PbS samples with 1.0 mol % Bi2S3 dispersion phase and doped with 1.0 mol % PbCl2 show even lower levels of lattice thermal conductivity and further enhanced ZT values of 1.1 at 923 K. The promising thermoelectric properties promote PbS as a robust alternative to PbTe and other thermoelectric materials.
關聯: 133(50) pp.20476–20487
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50300
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