The need for high performance of protonic ceramic fuel cells (PCFCs) has created significant interest in highly active cathode materials. Since a major charge carrier in PCFCs is proton, the use of triple conducting oxide (TCO) materials, in which oxygen ion, hole, and proton can be transported, is expected to improve the electrochemical performance of PCFCs. In this study, the applicability of PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) cathode, known as TCO material, in PCFCs is investigated. The chemical compatibility of PBSCF with BaCe0.55Zr0.3Y0.15O3–δ (BCZY3) proton-conducting electrolyte at high temperature is examined by XRD. To improve the interfacial structure between BCZY3 electrolyte and single-phase PBSCF cathode, PBSCF-BCZY3 composite layer is inserted between both layers. The optimization of sintering temperature and thickness of cathode results in the successful fabrication of PCFCs, exhibiting low ohmic resistance and high electrochemical performance.
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This work was supported by Technology Development Program to Solve Climate Changes through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT and Future Planning (2017M1A2A2044982), and the institutional research program of the Korea Institute of Science and Technology (Grant Nos. 2E30220 and 2V08440).
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Im, S., Lee, JH. & Ji, HI. PrBa0.5Sr0.5Co1.5Fe0.5O5+δ composite cathode in protonic ceramic fuel cells. J. Korean Ceram. Soc. 58, 351–358 (2021). https://doi.org/10.1007/s43207-021-00109-5