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

ABSTRACT: Developing efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is still a big challenge. Here, perovskite La_0.4Sr_0.6Ni_0.5Fe_0.5O₃ 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 (LaNiO₃, LaFeO₃, and LaNi_0.5Fe_0.5O₃) catalysts, La_0.4Sr_0.6Ni_0.5Fe_0.5O₃ exhibits superior OER performance, smaller tafel slope and lower overpotential. The high electrochemical performance of La_0.4Sr_0.6Ni_0.5Fe_0.5O₃ is attributed to its optimized e _g 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.

SUBMITTER: Guo Q 

PROVIDER: S-EPMC6491708 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature