1. The influence of A-site deficiency on the electrochemical properties of (Ba0.95La0.05)1-xFeO3-δ as an intermediate temperature solid oxide fuel cell cathode
- Author
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Simona Pepe, Jiapeng Liu, Alessio Belotti, Yuhao Wang, Emanuele Quattrocchi, Antonino Curcio, and Francesco Ciucci
- Subjects
Materials science ,Renewable Energy, Sustainability and the Environment ,Oxide ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Condensed Matter Physics ,Electrochemistry ,Oxygen ,Cathode ,law.invention ,Catalysis ,Crystal ,chemistry.chemical_compound ,Fuel Technology ,chemistry ,Chemical engineering ,law ,Solid oxide fuel cell ,Perovskite (structure) - Abstract
Developing cathodes capable of working at intermediate temperatures (IT) is key to improving solid oxide fuel cells’ (SOFC) durability, ease of operation, and manufacturing cost reduction. BaFeO3-δ (BFO)-based perovskites are ideal candidates because of their fast kinetics, which is due to the mixed conduction of oxygen vacancies and electron-holes. Thus, maximizing their oxygen vacancy and hole concentration can further enhance oxygen reduction reaction (ORR) catalysis. This work proposes to achieve this by generating A-site deficiency, which introduces negative charges into the perovskite crystal. The paper presents a computational and experimental analysis of this strategy on BFO-based cathodes, using (Ba0.95La0.05)1-xFeO3-δ as a case study. A-site deficiency increases the concentration of oxygen vacancies and holes, improving ORR catalysis. In addition, it eases oxygen surface exchange by hindering Ba segregation. As a result, A-site deficiency improves the overall electrochemical properties of BFO-based cathodes, providing a simple and effective method to enhance their performance.
- Published
- 2022
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