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Lanthanum strontium manganite, or LSM, is a doped manganite perovskite whose composition supports tunable electronic structure, magnetic order, and catalytic activity. At the nanoscale, LSM nanoparticles exhibit enhanced oxygen reduction reaction (ORR) activity and can act as noble-metal-free catalysts in alkaline media, making them attractive for use in metal–air batteries and alkaline fuel cells. It is one of the most established cathode materials for high-temperature solid oxide fuel cells (SOFCs), where it is valued for long-term stability, compatibility with YSZ electrolytes, and robust electrochemical performance.