Enhancing the thermoelectric power factor of nanostructured ZnCo2O4by Bi substitution

A. S. Alagar Nedunchezhian, D. Sidharth, R. Rajkumar, N. Yalini Devi, K. Maeda, M. Arivanandhan, K. Fujiwara, G. Anbalagan, R. Jayavel

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5 Citations (Scopus)


BixZnCo2-xO4(0 =x= 0.2) nanoparticles with differentxvalues have been prepared by the sol-gel method; the structural, morphological, thermal and thermoelectric properties of the prepared nanomaterials are investigated. XRD analysis confirms that Bi is completely dissolved in the ZnCo2O4lattice till thexvalues of =0.1 and the secondary phase of Bi2O3is formed at higherxvalue (x> 0.1). The synthesized nanomaterials are densified and the thermoelectric properties are studied as a function of temperature. The electrical resistivity of the BixZnCo2-xO4decreased withxvalue and it fell to 4 × 10-2O m for the sample withxvalue = 0.1. The Seebeck coefficient value increased with the increase of Bi substitution till thexvalue of 0.1 and decreased for the sample with higher Bi content (x= 0.2) as the resistivity of the sample increased due to secondary phase formation. With the optimum Seebeck coefficient and electrical resistivity, Bi0.1ZnCo1.9O4shows the high-power factor (a2s550 K) of 2.3 µW K-2m-1and figure of merit of 9.5 × 10-4at 668 K respectively, compared with other samples. The experimental results reveal that Bi substitution at the Co site is a promising approach to improve the thermoelectric properties of ZnCo2O4.

Original languageEnglish
Pages (from-to)18769-18775
Number of pages7
JournalRSC Advances
Issue number32
Publication statusPublished - 2020 May 18


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