Chlorine-anion doping induced multi-factor optimization in perovskties for boosting intrinsic oxygen evolution

The oxygen evolution reaction (OER) plays a crucial role in many electrochemical energy technologies, and creating multiple beneficial factors for OER catalysis is desirable for achieving high catalytic efficiency. Here, we highlight a new halogen-chlorine (Cl)-anion doping strategy to boost the OER activity of perovskite oxides. As a proof-of-concept, proper Cl doping at the oxygen site of LaFeO3 (LFO) perovskite can induce multiple favorable characteristics for catalyzing the OER, including rich oxygen vacancies, increased electrical conductivity and enhanced Fe-O covalency. Benefiting from these factors, the LaFeO2.9-delta Cl0.1 (LFOCl) perovskite displays significant intrinsic activity enhancement by a factor of around three relative to its parent LFO. This work uncovers the effect of Cl-anion doping in perovskites on promoting OER performance and paves a new way to design highly efficient electrocatalysts. (c) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

Automated summary

This study demonstrates a new halogen-chlorine (Cl)-anion doping strategy to enhance the oxygen evolution reaction (OER) activity of perovskite oxides by inducing favorable characteristics such as rich oxygen vacancies, increased electrical conductivity, and enhanced Fe-O covalency. The doped LaFeO2.9-delta Cl0.1 perovskite exhibits significant intrinsic activity enhancement compared to its parent material, providing a new approach to designing highly efficient electrocatalysts.