YBaCuO-type perovskites as potential air electrodes for SOFCs. The case of YSr2Cu2FeO7+δ
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2021
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RSC Publishing
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López-Paz, Sara A., et al. «YBaCuO-Type Perovskites as Potential Air Electrodes for SOFCs. The Case of YSr 2 Cu 2 FeO 7+δ». Journal of Materials Chemistry A, vol. 9, n.o 13, 2021, pp. 8554-60. https://doi.org/10.1039/D1TA00111F.
Abstract
The electrochemical properties of YSr2Cu2FeO7+d 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+d shows high oxygen reduction reaction activity at intermediate temperatures, revealing its potential applications as an air electrode in SOFCs.