Unprecedented Perovskite Oxyfluoride Membranes with High‐Efficiency Oxygen Ion Transport Paths for Low‐Temperature Oxygen Permeation

Unprecedented perovskite oxyfluoride membranes, a new generation of mixed ionic-electronic conducting (MIEC) membranes, feature extraordinary performance for low-temperature oxygen permeation, which transcend the performance of state-of-the-art MIEC membranes and fulfil commercial requirements. These results provide important progress for MIEC membranes and will potentially open the door to exploring high-performance MIEC compounds.