SrNb0.1Co0.7Fe0.2O3−δ Perovskite as a Next‐Generation Electrocatalyst for Oxygen Evolution in Alkaline Solution

Abstract The perovskite SrNb 0.1 Co 0.7 Fe 0.2 O 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 IrO 2 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 O 2 desorption capabilities possibly contribute to the excellent OER activity.