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	Optimization of Ag Nanoparticles on Thermoelectric Performance of Ba-Filled Skutterudite
	Peng, Kunling1; Guo, Lijie1; Wang, Guoyu2; Su, Xianli3; Zhou, Xiaoyuan1,4; Tang, Xingfeng3; Uher, Ctirad4
	2017-03-01
摘要	The influence of different amounts of Ag nanoparticles (0, 0.5, 1, 2, 5, and 10 wt%) on electrical and thermal transport properties has been investigated in the Ba-filled skutterudite compounds, Ba0.5Co4Sb12, which was synthesized by ball milling followed by hot pressing in this work. It was found that Ag nanoparticles drastically enhance the electric conductivity as well as the Seebeck coefficient. In addition, Ag nanoparticles reduce the lattice thermal conductivity through scattering a wider range of frequencies phonons, although the total thermal conductivity was not reduced because of the significantly enhanced electrical conductivity. Moreover, it is observed that Ag nanoparticles can uniformly disperse between the grain boundaries and on the surfaces of grains when the amount of Ag is less than 2 wt%. Ag3Sb impurity is produced when a greater concentration of Ag nanoparticles is used. Therefore, the optimal amount of Ag nanoparticles is 2 wt% in Ba0.5Co4Sb12, where the ZT = S-2 sigma T/kappa value reaches 1.4. These observations demonstrate an exciting scientific opportunity to raise the figure-of-merit of filled skutterudites.
关键词	Filled Skutterudite Ag Nanoparticles Phonon Scattering Thermoelectric Properties Nanostructure
DOI	10.1166/sam.2017.2406
发表期刊	SCIENCE OF ADVANCED MATERIALS
ISSN	1947-2935
卷号	9期号:3-4页码:682-687
通讯作者	Zhou, XY (reprint author), Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China. ; Zhou, XY ; Uher, C (reprint author), Univ Michigan, Dept Phys, 450 Church St, Ann Arbor, MI 48109 USA.
收录类别	SCI
WOS记录号	WOS:000397862500066
语种	英语