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Issue 48, 2014
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Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric performance

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Abstract

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.

Graphical abstract: Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric performance

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Publication details

The article was received on 05 Oct 2014, accepted on 29 Oct 2014 and first published on 29 Oct 2014


Article type: Paper
DOI: 10.1039/C4TA05285D
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2014,2, 20629-20635
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    Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric performance

    X. Zhou, G. Wang, L. Guo, H. Chi, G. Wang, Q. Zhang, C. Chen, T. Thompson, J. Sakamoto, V. P. Dravid, G. Cao and C. Uher, J. Mater. Chem. A, 2014, 2, 20629
    DOI: 10.1039/C4TA05285D

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