In situ construction of A-site high-entropy perovskites with interfacial CeO2 for a high-performance IT-SOFC air-electrode

Abstract

Developing an intermediate-temperature solid oxide fuel cell (IT-SOFC) is one of the most promising ways of achieving carbon neutrality, but its air-electrode is restricted by the conflict between the sluggish catalytic activity and durability. Herein, an A-site high-entropy perovskite composite La_0.2Ba_0.2Sr_0.2Ca_0.2Ce_0.2−xCoO_3−δ–xCeO₂ (LBSCCC–CeO₂) air-electrode material is fabricated via a one-step self-constructing strategy, which shows excellent oxygen reduction activity and stability due to the high-entropy structure and the synergy effect between LBSCCC and interfacial CeO₂. This work provides a new way of fabricating high-performance air-electrodes in IT-SOFCs.