AUTHOR=Guo Qiang , Li Xiang , Wei Haifei , Liu Yi , Li Lanlan , Yang Xiaojing , Zhang Xinghua , Liu Hui , Lu Zunming 

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

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00224

DOI=10.3389/fchem.2019.00224

ISSN=2296-2646

ABSTRACT=<p>Developing efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is still a big challenge. Here, perovskite La<sub>0.4</sub>Sr<sub>0.6</sub>Ni<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> 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<sub>3</sub>, LaFeO<sub>3</sub>, and LaNi<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub>) catalysts, La<sub>0.4</sub>Sr<sub>0.6</sub>Ni<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> exhibits superior OER performance, smaller tafel slope and lower overpotential. The high electrochemical performance of La<sub>0.4</sub>Sr<sub>0.6</sub>Ni<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> is attributed to its optimized <italic>e</italic><sub><italic>g</italic></sub> 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.</p>