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	Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric performance
	Zhou, Xiaoyuan1,3; Wang, Guiwen1,2; Guo, Lijie1; Chi, Hang3; Wang, Guoyu2,3; Zhang, Qifeng4; Chen, Changqiang3; Thompson, Travis6; Sakamoto, Jeff6; Dravid, Vinayak P.5
	2014
摘要	The influence of hierarchical TiO2 inclusions on electrical and thermal transport properties has been investigated in the Ba-filled skutterudite compound Ba0.3Co4Sb12 synthesized by ball milling followed by hot pressing. The hierarchical TiO2, with the morphology of nanocrystallite aggregates, was prepared using a carbon sphere-templated method. It was found that TiO2 inclusions strongly enhance the Seebeck coefficient while they weakly degrade the electric conductivity. In addition, TiO2 inclusions reduce significantly the lattice thermal conductivity through all-scale length phonon scattering due to the hierarchically-structured TiO2 particles. ZT values up to 1.2 were obtained for Ba0.3Co4Sb12 with an optimal amount and dispersion of TiO2 inclusions. These observations demonstrate an exciting scientific opportunity to raise the figure-of-merit of filled skutterudites via hierarchical dispersion.
DOI	10.1039/c4ta05285d
发表期刊	JOURNAL OF MATERIALS CHEMISTRY A
ISSN	2050-7488
卷号	2期号:48页码:20629-20635
通讯作者	Zhou, XY (reprint author), Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000345531200028
语种	英语