Electrospun Porous Perovskite La_(0.6)Sr_(0.4)Co_(1-x)Fe_xO_(3-δ) Nanofibers for Efficient Oxygen Evolution Reaction

摘要

A series of porous La_(0.6)Sr_(0.4)Co_(1-x)Fe_xO_(3-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 La_(0.6)Sr_(0.4)Co_(0.6)Fe_(0.4)O_(3-δ) (LSCF6464) nanofiber catalyst (with a specific surface area of 24.2 m~2 g~(-1)) exhibits a potential (vs Ag/AgCl) of 647 mV at 10 mA cm_(disk)~(-2), 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 IrO_2 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_(disk)~(-2) for more than 3 h. In contrast, the performance of an IrO_2 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.