Publication date: 10th April 2024
Protonic ceramic electrochemical cells (PCECs) are garnering considerable attention for their ability to efficiently and reversibly convert chemical fuels into electricity at temperatures below 600°C. However, the oxygen electrode's slow reaction kinetics lead to inadequate reaction activity and reduced cell stability. Therefore, developing a highly active oxygen electrode is crucial for achieving high-performance PCECs. Introducing high-valence cations (such as V5+, Nb5+, and Ta5+) into the SrCoO3-𝛿 lattice has recently been identified as a potential strategy to enhance electrocatalytic activity and stability. Nonetheless, Sr-based oxygen electrodes face durability issues due to Sr segregation during PCEC operation. As an alternative, BaCoO3-𝛿 based materials are attracting attention as Sr-free oxygen electrodes, benefiting from the Ba cation's low electronegativity, large ionic radius, and cost-effectiveness. Inspired by previous studies, we designed Ta-doped BaCoO3-𝛿 perovskite oxides, which exhibit exceptional activity and durability for bifunctional oxygen electrodes. This work demonstrates the effectiveness of Ta doping in the BaCoO3-𝛿 lattice, which promotes the formation of a cubic perovskite structure and enhances electrocatalytic activity, leading to high-performance PCECs.
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