Fabrication and testing of ceramic thermoelectric multi-leg module for high-temperature energy conversion

Amirkhizi, P. ; Hedayati, M. ; Madre, M.A. (Universidad de Zaragoza) ; Dura, O.J. ; Torres, M.A. (Universidad de Zaragoza) ; Sotelo, A. (Universidad de Zaragoza) ; Kovalevsky, A.V. ; Rasekh, Sh. (Universidad de Zaragoza)

Resumen: This study investigates the fabrication and performance of ceramic-based thermoelectric modules for high-temperature energy conversion, based on Ca2.93Sr0.07Co4O9 and Ca0.91Y0.03La0.03Yb0.03MnO3 p- and n-type materials. The p-type materials were prepared through attrition milling and classical sintering, while ball milling and hot uniaxial pressing were used for the n-type legs. The power factor reached 0.62 mW/(K2m) for the p-type and 0.33 mW/(K2m) for the n-type materials at 800 °C, being comparable to some of the best-reported values in literature. The lower thermal conductivity of n-type material (1.24 W/K/m) compared to the p-type material (1.56 W/K/m) resulted in similar ZT values for n-type (0.29) and p-type (0.43). The thermal expansion behaviour of the materials was also evaluated, demonstrating good thermal compatibility between the p- and n-type legs. The module's performance was tested at hot-side temperatures up to 900 °C, yielding a power density of 34 W/m2. Moreover, the module demonstrated an energy conversion efficiency of 0.8 % (actual) and 6 % (theoretical), thereby underscoring the practical potential of these materials. Additionally, the module exhibited excellent long-term thermal stability, maintaining its performance after 2000 h of exposure at 900 °C and after undergoing 100 thermal cycles, demonstrating its suitability for high-temperature energy recovery applications.

Idioma: Inglés

DOI: 10.1016/j.jallcom.2025.178628

Año: 2025

Publicado en: JOURNAL OF ALLOYS AND COMPOUNDS 1013 (2025), 178628 [9 pp.]
ISSN: 0925-8388

Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/DGA/T54-23R

Tipo y forma: Article (Published version)

Área (Departamento): Área Expresión Gráfica en Ing. (Dpto. Ingeniería Diseño Fabri.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)