Ruddlesden-Popper Perovskite Materials for Solid Oxide Fuel Cell Cathode: A Review

Abstract

This review paper summarizes the recent findings on Ruddlesden-Popper (RP) phase materials for solid oxide fuel cell (SOFC) cathodes. These materials, known for their unique layered structure, show excellent performance in intermediate-temperature SOFCs due to their outstanding catalytic activity for the oxygen reduction reaction (ORR) and relatively high durability. RP perovskites are notable for their fast oxygen surface exchange rates and stability under operating conditions, making them suitable for both oxide ion and proton-conducting SOFCs. The paper examines the relationship between their crystal structure, physical properties, and the transport mechanisms of oxygen ions. Key strategies to enhance the properties of RP perovskites in SOFCs are discussed, including doping to optimize conductivity and thermal expansion coefficients, and creating composite cathodes to improve stability and performance. The paper also briefly covers the long-term stability of these materials with some examples. Finally, the review highlights the need for further research on the ORR kinetics of RP perovskites, especially in proton-conducting SOFCs, to fully realize their potential for efficient and durable energy conversion technologies.