Repositorio UFRO · Omeka S

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