Thermoelectric properties of Ni0. 05Mo3Sb5. 4Te1. 6 composites with NiSb nanocoating

Article

Nandihalli, Nandihalli, Robert, Liang, Wijethunge, Dimuthu, Zhou, Norman and Kleinke, Holger. 2018. "Thermoelectric properties of Ni0. 05Mo3Sb5. 4Te1. 6 composites with NiSb nanocoating." AIP Advances. 8. https://doi.org/10.1063/1.5038675
Article Title

Thermoelectric properties of Ni0. 05Mo3Sb5. 4Te1. 6 composites with NiSb nanocoating

ERA Journal ID200127
Article CategoryArticle
AuthorsNandihalli, Nandihalli, Robert, Liang, Wijethunge, Dimuthu, Zhou, Norman and Kleinke, Holger
Journal TitleAIP Advances
Journal Citation8
Article Number125304
Number of Pages12
Year2018
PublisherAIP Publishing
Place of PublicationUnited States
ISSN2158-3226
Digital Object Identifier (DOI)https://doi.org/10.1063/1.5038675
Web Address (URL)https://pubs.aip.org/aip/adv/article/8/12/125304/127142
Abstract

NiSb nanoparticles by 0.034, 0.074 and 0.16 volume fractions were successfully coated on bulk polycrystalline Ni0.05Mo3Sb5.4Te1.6 thermoelectric (TE) particles through a solvothermal route without deteriorating the bulk Ni0.05Mo3Sb5.4Te1.6 material. The samples were consolidated through hot pressing and their thermoelectric (TE) properties were characterized. At 400 K, 500 K, and 600 K, 0.074 NiSb sample exhibited 22%, 16% and 11.3% increases in the power factor (P.F.) compared to bulk material. The main contributing factor to this enhanced power factor is the elevated electrical conductivity. For the same sample, the reciprocal relationship between Seebeck coefficient and electrical conductivity is decoupled. Sample 0.16 NiSb exhibited the highest electrical conductivity among the three samples. The thermal conductivity of the 0.16 sample was less temperature sensitive compared to other samples. HRTEM and SEM tools were applied to comprehend microstructural features and their relationship to TE transport properties. Pore effect on the thermal and electrical conductivity was elucidated. This study shows that grain-boundary manipulation via this wet chemistry technique is indeed an economically viable method to fabricate and optimize the transport properties of bulk TE materials.

KeywordsChemical synthesis; Interfaces; Thermoelectric effects; Nanoparticle; Wet chemistry; Composite materials ; Transport properties; Phonons; Electrical conductivity; Thermal conductivity
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401607. Metals and alloy materials
Byline AffiliationsUniversity of Waterloo, Canada
University of Moratuwa, Sri Lanka
School of Engineering
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