Improved High Temperature Thermoelectric Properties in Misfit Ca3Co4O9 by Thermal Annealing

Primer Autor
Chatterjee, Arindom
Co-autores
El Sachat, Alexandros
Banik, Ananya
Biswas, Kanishka
Castro-Alvarez, Alejandro
Sotomayor Torres, Clivia M. M.
Santiso, Jose
Chavez-Angel, Emigdio
Título
Improved High Temperature Thermoelectric Properties in Misfit Ca3Co4O9 by Thermal Annealing
Editorial
MDPI
Revista
ENERGIES
Lenguaje
en
Resumen
Ca3Co4O9, a p-type thermoelectric material based on transition-metal oxides, has garnered significant interest due to its potential in thermoelectric applications. Its unique misfit-layered crystal structure contributes to low thermal conductivity and a high Seebeck coefficient, leading to a thermoelectric figure of merit (zT) of & GE,1 at 1000 K. Conventionally, it has been believed that thermopower reaches its upper limit above 200 K. However, our thermopower measurements on polycrystalline Ca3Co4O9 samples have revealed an unexpected increase in thermopower above 380 K. In this study, we investigate the effects of high oxygen pressure annealing on Ca3Co4O9 and provide an explanation based on the mixed oxide states of cobalt and carrier hopping. Our results demonstrate that annealing induces modifications in the defect chemistry of Ca3Co4O9, leading to a decrease in electron hopping probability and the emergence of a thermal activation-like behavior in thermopower. These findings carry significant implications for the design and optimization of thermoelectric materials based on misfit cobaltates, opening new avenues for enhanced thermoelectric performance.
Fecha Publicación
2023
Tipo de Recurso
artículo original
doi
10.3390/en16135162
Formato Recurso
PDF
Palabras Claves
Ca3Co4O9
thermoelectricity
heike's limit
cobaltates
Ubicación del archivo
http://dx.doi.org/10.3390/en16135162
Categoría OCDE
Energía y combustibles
Materias
Ca3Co4O9
termoelectricidad
límite de Heike
cobaltatos
Identificador del recurso (Mandatado-único)
artículo original
Versión del recurso (Recomendado-único)
versión publicada
License
CC BY 4.0
Condición de la licencia (Recomendado-repetible)
CC BY 4.0
Derechos de acceso
acceso abierto
Access Rights
acceso abierto
Id de Web of Science
WOS:001030903300001
Tipo de ruta
verde# dorado
Categoría WOS
Energía y combustibles
Referencia del Financiador (Mandatado si es aplicable-repetible)
MINECO MAT2016-77100-C2-1-P
CNRS-CSIC PICS 261091
UE H2020-MSCA-RISE-2014 645658
AGAUR 2017SGR
MINECO SEV-2017-0706
EU H2020 101029727
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