Affiliation:
1. Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional Materials Smart Sensing Interdisciplinary Science Center Haihe Laboratory of Sustainable Chemical Transformations School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300350 P. R. China
Abstract
AbstractRare earth (RE)‐based perovskites are considered as promising platform for oxygen evolution reaction (OER) due to their low cost and tunable structures. However, the systematic synthesis of perovskite catalysts with satisfactory performance has rarely been reported. Herein, a general synthetic protocol for RE‐substituted LaCoO3 (RE‐LCO) perovskites is demonstrated. Particularly, after loaded with RuO2, the as‐prepared RuO2:0.2Ce‐LCO hybrid structures exhibit OER performance with a low overpotential of 135 mV at 10 mA cm−2 in 1.0 m KOH, together with remarkable long‐term operation, representing one of the most efficient and robust Ru‐based catalysts. Comprehensive experimental results indicate that the enhanced OER mechanism is attributed to the Ce‐substitution, which alters the geometric configuration of CoO6 octahedra and generates more oxygen vacancies. Furthermore, the robust interaction between Ce‐LCO and RuO2 stabilizes the valence state of Ru site. Theoretical calculations corroborate that Co 3d orbitals overlap with Ce 4f orbitals near the Fermi level, greatly improving the electron transfer between Co and Ce atoms.
Funder
National Natural Science Foundation of China