Significantly Improving the Durability of Single-Chamber Solid Oxide Fuel Cells: A Highly Active CO ₂ -Resistant Perovskite Cathode

The single-chamber solid oxide fuel cell (SC-SOFC) represents an attractive alternative to batteries for micropower applications given its simplified stack design, easy gas management, lower operation temperature, and quicker start-up. Its stable operation over long duration relies on the availability of CO ₂ -resistant cathode materials with high oxygen reduction reaction (ORR) activity. Here, we reported a novel perovskite oxide cathode SrSc _0.075 Ta _0.025 Fe _0.9 O _3-δ (SSTF75), which provides CO ₂ resistance and high ORR activity. A peak power density of 1430 mW cm ^-2 was achieved with the SSTF75/Sm _0.2 Ce _0.8 O _1.9 cathode at 650 °C with a methane and oxygen gas mixture (1:1 v/v ratio). It retained stable voltage performance at 600 °C for an over 90 h duration when discharged at a current density of 1000 mA cm ^-2 . This work not only represents an advancing step in the SC-SOFC field but also authenticates an effective codoping strategy for the design of a CO ₂ -resistant cathode for low-temperature applications.