Sr, Fe Co-doped Perovskite Oxides With High Performance for Oxygen Evolution Reaction

Developing efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is still a big challenge. Here, perovskite La Sr Ni Fe O nanoparticles were rationally designed and synthesized by the sol-gel method with an average size around 25 nm, and it has a remarkable intrinsically activity and stability in 1 M KOH solution. Compared with other perovskite (LaNiO , LaFeO , and LaNi Fe O ) catalysts, La Sr Ni Fe O exhibits superior OER performance, smaller tafel slope and lower overpotential. The high electrochemical performance of La Sr Ni Fe O is attributed to its optimized filling (~1.2), as well as the excellent conductivity. This study demonstrates co-doping process is an effective way for increasing the intrinsic catalytic activity of the perovskite.