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Issue 6, 2016
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Electronegative guests in CoSb3

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Introducing guests into a host framework to form a so called inclusion compound can be used to design materials with new and fascinating functionalities. The vast majority of inclusion compounds have electropositive guests with neutral or negatively charged frameworks. Here, we show a series of electronegative guest filled skutterudites with inverse polarity. The strong covalent guest–host interactions observed for the electronegative group VIA guests, i.e., S and Se, feature a unique localized “cluster vibration” which significantly influences the lattice dynamics, together with the point-defect scattering caused by element substitutions, resulting in very low lattice thermal conductivity values. The findings of electronegative guests provide a new perspective for guest-filling in skutterudites, and the covalent filler/lattice interactions lead to an unusual lattice dynamics phenomenon which can be used for designing high-efficiency thermoelectric materials and novel functional inclusion compounds with open structures.

Graphical abstract: Electronegative guests in CoSb3

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The article was received on 01 Feb 2016, accepted on 19 Apr 2016 and first published on 19 Apr 2016

Article type: Paper
DOI: 10.1039/C6EE00322B
Citation: Energy Environ. Sci., 2016,9, 2090-2098
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    Electronegative guests in CoSb3

    B. Duan, J. Yang, J. R. Salvador, Y. He, B. Zhao, S. Wang, P. Wei, F. S. Ohuchi, W. Zhang, R. P. Hermann, O. Gourdon, S. X. Mao, Y. Cheng, C. Wang, J. Liu, P. Zhai, X. Tang, Q. Zhang and J. Yang, Energy Environ. Sci., 2016, 9, 2090
    DOI: 10.1039/C6EE00322B

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