Highly enhanced thermoelectric properties of nanostructured Bi2S3 bulk materials via carrier modification and multi-scale phonon scattering

Wu, Yi1; Lou, Qing2; Qiu, Yang2; Guo, Jun1; Mei, Zhi-Yuan1; Xu, Xiao2; Feng, Jing1; He, Jiaqing2; Ge, Zhen-Hua1

2019-06

10.1039/c9qi00213h

Inorganic Chemistry Frontiers   影响因子和分区

2052-1553

Bismuth sulfide (Bi2S3) with an earth-abundant elemental composition has attracted wide attention as a promising n-type thermoelectric material in recent years. However, the thermoelectric performance of Bi2S3 is limited by its low electrical conductivity. It is therefore vital to choose an effective dopant for enhancing the electrical transport properties of Bi2S3. In this work, by using the solid-state reaction and the spark plasma sintering technique, Bi2S3 bulk materials doped with x mol% LaCl3 (x = 0, 1.0, 2.0, 3.0) were successfully fabricated. The conductivity of Bi2S3 samples doped with 2 mol% LaCl3 (about 153 S cm(-1)) was one order of magnitude higher than that of the pristine Bi2S3 sample, resulting in a high power factor of 483 mu W m(-1) K-2 at 625 K. The lattice thermal conductivity of the doped samples decreased due to more grain boundaries, point defects and nano-precipitates. Consequently, a peak thermoelectric figure-of-merit (ZT) of 0.50 at 625 K was obtained for the Bi2S3 sample with 2 mol% LaCl3 doping, which was over four times higher compared to that of pristine Bi2S3 (about 0.11 at 625 K). The results suggest that the dopant LaCl3 is effective for modifying carrier concentration and reducing lattice thermal conductivity.

SCI ; EI

英语

其他

Science, Technology, and Innovation Commission of Shenzhen Municipality[KQCX2015033110182370] ; Science, Technology, and Innovation Commission of Shenzhen Municipality[JCYJ20150831142508365]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000472193200004

ROYAL SOC CHEMISTRY

20192507060651

Carrier concentration ; Chlorine compounds ; Crystal lattices ; Grain boundaries ; Lanthanum compounds ; Layered semiconductors ; Materials handling equipment ; Point defects ; Solid state reactions ; Spark plasma sintering ; Sulfur compounds ; Thermal conductivity ; Thermoelectric equipment ; Thermoelectricity

Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Materials Handling Equipment:691.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Chemical Reactions:802.2 ; Crystal Lattice:933.1.1

Web of Science

1.Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Wu, Yi,Lou, Qing,Qiu, Yang,et al. Highly enhanced thermoelectric properties of nanostructured Bi2S3 bulk materials via carrier modification and multi-scale phonon scattering[J]. Inorganic Chemistry Frontiers,2019,6(6):1374-1381.

Wu, Yi.,Lou, Qing.,Qiu, Yang.,Guo, Jun.,Mei, Zhi-Yuan.,...&Ge, Zhen-Hua.(2019).Highly enhanced thermoelectric properties of nanostructured Bi2S3 bulk materials via carrier modification and multi-scale phonon scattering.Inorganic Chemistry Frontiers,6(6),1374-1381.

Wu, Yi,et al."Highly enhanced thermoelectric properties of nanostructured Bi2S3 bulk materials via carrier modification and multi-scale phonon scattering".Inorganic Chemistry Frontiers 6.6(2019):1374-1381.