SrNb_0.1Co_0.7Fe_0.2O_3-δ perovskite as a next-generation electrocatalyst for oxygen evolution in alkaline solution

The perovskite SrNb_0.1Co_0.7Fe_0.2O_3-δ (SNCF) is a promising OER electrocatalyst for the oxygen evolution reaction (OER), with remarkable activity and stability in alkaline solutions. This catalyst exhibits a higher intrinsic OER activity, a smaller Tafel slope and better stability than the state-of-the-art precious-metal IrO₂ catalyst and the well-known BSCF perovskite. The mass activity and stability are further improved by ball milling. Several factors including the optimized e_g orbital filling, good ionic and charge transfer abilities, as well as high OH^- adsorption and O₂ desorption capabilities possibly contribute to the excellent OER activity.