YBaCuO-type perovskites as potential air electrodes for SOFCs. The case of YSr2Cu2FeO7+δ

The electrochemical properties of YSr2Cu2FeO7+δ with YBaCuO-type structure have been studied. The temperature dependent oxygen content of this oxide has a marked influence on its p-type conducting behavior, since topochemical oxygen release occurs on heating above 673 K while reversible oxygen uptak...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-04, Vol.9 (13), p.8554-8560
Main Authors: López-Paz, Sara A, Marín-Gamero, Rafael, Xabier Martínez de Irujo-Labalde, Sánchez-Marcos, Jorge, Perez-Coll, Domingo, Miguel Ángel Alario y Franco, García-Martín, Susana
Format: Article
Language:English
Subjects:
Air temperature
Cell size
Chemical reduction
Copper
Electrochemical analysis
Electrochemistry
Electrodes
Heat transmission
Iron
Oxygen
Oxygen consumption
Oxygen content
Oxygen reduction reactions
Oxygen uptake
Perovskites
Temperature dependence
Unit cell
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Summary:The electrochemical properties of YSr2Cu2FeO7+δ with YBaCuO-type structure have been studied. The temperature dependent oxygen content of this oxide has a marked influence on its p-type conducting behavior, since topochemical oxygen release occurs on heating above 673 K while reversible oxygen uptake takes place on cooling. Mixed valence Fe3+/Fe4+ and Cu2+/Cu3+ in combination with anion vacancies within the oxygen-sublattice suggest mixed (electronic and ionic) conductivity in this oxide. Electrochemical measurements indicate that YSr2Cu2FeO7+δ shows high oxygen reduction reaction activity at intermediate temperatures, revealing its potential applications as an air electrode in SOFCs.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta00111f