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Composites between Perovskite and Layered Co-Based Oxides for Modification of the Thermoelectric Efficiency

1
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2
Institut des Matériaux Jean Rouxel, University of Nantes, CNRS, IMN, F-44000 Nantes, France
3
National Synchrotron Radiation Centre Solaris, 30-392 Kraków, Poland
4
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Kraków, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Amir Pakdel and David Berthebaud
Materials 2021, 14(22), 7019; https://doi.org/10.3390/ma14227019
Received: 19 October 2021 / Revised: 6 November 2021 / Accepted: 16 November 2021 / Published: 19 November 2021
(This article belongs to the Topic Thermoelectric Energy Harvesting)
The common approach to modify the thermoelectric activity of oxides is based on the concept of selective metal substitution. Herein, we demonstrate an alternative approach based on the formation of multiphase composites, at which the individual components have distinctions in the electric and thermal conductivities. The proof-of-concept includes the formation of multiphase composites between well-defined thermoelectric Co-based oxides: Ni, Fe co-substituted perovskite, LaCo0.8Ni0.1Fe0.1O3 (LCO), and misfit layered Ca3Co4O9. The interfacial chemical and electrical properties of composites are probed with the means of SEM, PEEM/XAS, and XPS tools, as well as the magnetic susceptibility measurements. The thermoelectric power of the multiphase composites is evaluated by the dimensionless figure of merit, ZT, calculated from the independently measured electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (λ). It has been demonstrated that the magnitude’s electric and thermal conductivities depend more significantly on the composite interfaces than the Seebeck coefficient values. As a result, the highest thermoelectric activity is observed at the composite richer on the perovskite (i.e., ZT = 0.34 at 298 K). View Full-Text
Keywords: cobalt-based perovskites; misfit layered oxides; thermoelectric oxides; multiphase composites cobalt-based perovskites; misfit layered oxides; thermoelectric oxides; multiphase composites
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MDPI and ACS Style

Harizanova, S.; Faulques, E.; Corraze, B.; Payen, C.; Zając, M.; Wilgocka-Ślęzak, D.; Korecki, J.; Atanasova, G.; Stoyanova, R. Composites between Perovskite and Layered Co-Based Oxides for Modification of the Thermoelectric Efficiency. Materials 2021, 14, 7019. https://doi.org/10.3390/ma14227019

AMA Style

Harizanova S, Faulques E, Corraze B, Payen C, Zając M, Wilgocka-Ślęzak D, Korecki J, Atanasova G, Stoyanova R. Composites between Perovskite and Layered Co-Based Oxides for Modification of the Thermoelectric Efficiency. Materials. 2021; 14(22):7019. https://doi.org/10.3390/ma14227019

Chicago/Turabian Style

Harizanova, Sonya, Eric Faulques, Benoit Corraze, Christophe Payen, Marcin Zając, Dorota Wilgocka-Ślęzak, Józef Korecki, Genoveva Atanasova, and Radostina Stoyanova. 2021. "Composites between Perovskite and Layered Co-Based Oxides for Modification of the Thermoelectric Efficiency" Materials 14, no. 22: 7019. https://doi.org/10.3390/ma14227019

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