A-Site Engineering of the High-Entropy Perovskite PrLaBaSrCaFeO Cathode for Intermediate-Temperature SOFCs.

Mixed-oxygen ionic and electronic conduction is crucial for the cathode materials of solid oxide fuel cells, ensuring high efficiency and low-temperature operation. However, the electronic and oxygen ionic conductivity of traditional Fe-based layered perovskite cathode materials is low, resulting in insufficient oxygen reduction reactivity. Herein, a type of high-entropy perovskite oxide consisting of five equimolar metals, PrLaBaSrCaFeO (PLBSCF), a high-performance cobalt-free cathode derived from the PrBaFeO (PBF), is proposed.