Abstract
To make full use of the advantages of solid oxide cells (SOCs) under actual operating conditions, hetero-structured La0.6Sr0.4CoO3-δ/LaSrCoO4±δ (LSC113/214) thin film electrodes are prepared and investigated by a novel high temperature micro-probe electrochemical test platform for SOCs. The results show that the surface exchange coefficient (kq) of LSC113/214 thin films is 3–10 times higher than that of single phase LSC113 in 773–1123 K. ToF-SIMS and XPS characterizations show that LSC113/214 hetero-interface leads to Sr enrichment at interfacial region and stabilizes it against detrimental Sr segregation. This hetero-interface further induces increased number of active oxygen vacancies and leads to accelerated oxygen exchange kinetics by raising O 2p center closer to Fermi level. This work provides significantly enhanced ORR/OER activity of hetero-structured LSC113/214 oxygen electrode at operation conditions and brings substantial technical benefits for the SOC systems.
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