Influence of multi-walled carbon nanotubes on the thermoelectric properties of La-filled CoSb3 skutterudite composites

JOURNAL OF ALLOYS AND COMPOUNDS

卷:695

Article

Che, Ping¹  Wang, Beibei¹  Sun, Changyan¹  Han, Yongsheng²  Li, Wenjun¹ 

[1] Univ Sci & Technol Beijing, Sch Chem & Biol Engn, Dept Chem, Beijing Key Lab Sci & Applicat Funct Mol & Crysta, Beijing 100083, Peoples R China

[2] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China

关键词: CoSb3;    Composites;    Skutterudite;    Thermoelectric properties;    Multi-walled carbon nanotubes;    Lanthanum filled;   

DOI  :  10.1016/j.jallcom.2016.11.024

来源: Elsevier

【 摘 要 】

Ideal thermoelectric materials are featured with high electrical and low thermal conduction. Oxide nanoparticles are usually added to these materials to increase their thermoelectric properties. The conductive particles are seldom employed since they have a complex effect on thermoelectric properties. Here we select the multi-walled carbon nanotubes (MWCNTs) as additives to synthesize a composite of La-filled CoSb3 skutterudite via a solvothermal method. The electrical conductivities and Seebeck coefficients of the obtained composites are tested by using a four-probe technique. The thermal conductivities are measured by a thermal diffusivity system using Pyroceram as a reference sample. The thermoelectric properties of the La-filled CoSb3/MWCNTs composites are investigated in the temperature range of 300-800 K. The influence of the MWCNTs on the electrical conductivity, the Seebeck coefficient and the thermal conductivity of the La-filled CoSb3/MWCNTs composites are discussed. The maximum figure of merit of the composites at 780 K is improved by 37%. (C) 2016 Elsevier B.V. All rights reserved.

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