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Issue 40, 2019, Issue in Progress

Enhanced thermoelectric properties of Bi2S3 polycrystals through an electroless nickel plating process

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Abstract

Bi2S3 is an eco-friendly alternative compound for thermoelectric devices. However, the low electrical conductivity of the pristine Bi2S3 hinders the improvement of its ZT value, which further restricts its application in the field of thermoelectricity. In this work, we report the first attempt to optimize the thermoelectric properties of Bi2S3 by electroless nickel plating. A nickel plated Bi2S3 powder sample was synthesized by electroless nickel plating on the precursor Bi2S3 powder prepared by mechanical alloying. Then, the powder was sintered to a bulk material by spark plasma sintering. The relationships between the composition, microstructure and thermoelectric properties of the bulk samples were investigated. The XRD results showed a AgBi3S5 second phase which was formed by the reaction of Ag residues with the Bi2S3 substrate during the sintering process. The nickel element and AgBi3S5 second phase introduced in the nickel plating process directly affect the electronic conductivity and Seebeck coefficient of the nickel plating sample, resulting in the relatively high power factor of 244 μW m−1 K−2 at 628 K. What's more, the thermal conductivity of the sample was also reduced moderately, obtaining a low value of 0.40 μW m−1 K−1 at 628 K. Therefore, a maximum ZT value of 0.38 was obtained at 628 K for the nickel plated sample, which is three times higher than that (0.12 at 628 K) of pristine Bi2S3 materials.

Graphical abstract: Enhanced thermoelectric properties of Bi2S3 polycrystals through an electroless nickel plating process

Article information


Submitted
21 Jun 2019
Accepted
19 Jul 2019
First published
25 Jul 2019

This article is Open Access

RSC Adv., 2019,9, 23029-23035
Article type
Paper

Enhanced thermoelectric properties of Bi2S3 polycrystals through an electroless nickel plating process

Y. Chang, Q. Yang, J. Guo, J. Feng and Z. Ge, RSC Adv., 2019, 9, 23029 DOI: 10.1039/C9RA04653D

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