Electrospun Porous Perovskite La0.6Sr0.4Co1–xFexO3–δ Nanofibers for Efficient Oxygen Evolution Reaction

A series of porous La0.6Sr0.4Co1–xFexO3–δ (x = 0–1) nanofibers with diameters of 54–71 nm are synthesized by electrospinning using appropriate polymers and different processing parameters. When tested as a catalyst for oxygen evolution reaction (OER), an La0.6Sr0.4Co0.6Fe0.4O3–δ (LSCF6464) nanofiber catalyst (with a specific surface area of 24.2 m2 g−1) exhibits a potential (vs Ag/AgCl) of 647 mV at 10 mA cm−2disk, which is much smaller than that of a powder‐type commercial LSCF (786 mV) and also smaller than that of the state‐of‐the‐art IrO2 catalysts (660 mV). The LSCF6464 nanofiber catalyst further delivers an outstanding durability, with almost no observable change in potential at a current density of 10 mA cm−2disk for more than 3 h. In contrast, the performance of an IrO2 catalyst degrades continuously under the same testing conditions. The findings suggest that the LSCF nanofiber is a promising OER electrocatalyst for metal–air batteries and water electrolysis.