Tailoring the Reversible Phase Transition of Perovskite Nanofiber Electrodes for High-Performance and Durable Reversible Solid Oxide Cells

La 0.3 Sr 0.6 Ti 0.1 Co 0.2 Fe 0.7 O 3− δ (LSTCF) nanofibers showed high structural reversibility. LSTCF fibers and CoFe nanoparticles were reconstructed through a reversible phase transition process. The LSTCF fiber electrode demonstrated excellent activity and stability for power and fuel co-generation.