Perovskite materials have recently attracted extensive attention since tailoring their chemical compositions has led to remarkable activity toward oxygen reduction reaction. However, the desired electrocatalytic activity is limited by the morphological effect, and lack of methods to achieve large surface area. Herein we report an effective strategy to synthesize three-dimensional ordered macroporous (3DOM) perovskite oxides, where La0.75Sr0.25MnO3 (3DOM LSMO) displays excellent ORR activity and durability with considerable specific surface area (43.1 m2 g-1). The electrochemical results exhibit that the electron transferred numbers (n) is close to 4 and the H2O2 yield (% H2O2) is as low as 10% for 3DOM LSMO, which mainly attributes to comprehensive effect of the reduced Mn valence state, the increased specific surface, and the exposed high activity crystal planes. First-principles study confirms that the lowest overpotential obtained by LSMO is in good agreement with the experimental results. Our work demonstrates perovskite oxides with larger surface area could be advanced oxygen catalysts with wide applications.
Bibliographical noteFunding Information:
This work is supported from the Earth Engineering Center and center for Advanced Materials for Energy and Environment at Columbia University and the School of Chemical Engineering, Northwest University . Support from the National Natural Science Foundation of China ( 11872302 ), Xi'an Science and Technology Plan Project, China (2019218214GXRC018CG019-GXYD18.8), Natural Science Project of Shaanxi Provincial Department of Education ( 20JK0927 ).
© 2022 Elsevier B.V.
- A/B-site doping
- First principles
- Large surface area
- Oxygen reduction reaction
- Three-dimensional ordered structure