Enhancing Electrocatalytic Activity of Perovskite Oxides by Tuning Cation Deficiency for Oxygen Reduction and Evolution Reactions
MetadataShow full item record
Development of cost-effective and efficient electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of prime importance to emerging renewable energy technologies. Here, we report a simple and effective strategy for enhancing ORR and OER electrocatalytic activity in alkaline solution by introducing A-site cation deficiency in LaFeO3 perovskite; the enhancement effect is more pronounced for the OER than the ORR. Among the A-site cation deficient perovskites studied, La0.95FeO3-δ (L0.95F) demonstrates the highest ORR and OER activity and, hence, the best bifunctionality. The dramatic enhancement is attributed to the creation of surface oxygen vacancies and a small amount of Fe4+ species. This work highlights the importance of tuning cation deficiency in perovskites as an effective strategy for enhancing ORR and OER activity for applications in various oxygen-based energy storage and conversion processes.
Showing items related by title, author, creator and subject.
Su, Chao ; Wang, Wei ; Shao, Zongping (2021)Conspectus Clean energy conversion technologies can power progress for achieving a sustainable future, while functional materials lie at the core of these technologies. In particular, highly efficient electrocatalysts ...
New Undisputed Evidence and Strategy for Enhanced Lattice-Oxygen Participation of Perovskite Electrocatalyst through Cation Deficiency ManipulationXu, Xiaomin ; Pan, Y.; Zhong, Yijun ; Shi, C.; Guan, D.; Ge, L.; Hu, Z.; Chin, Y.Y.; Lin, H.J.; Chen, C.T.; Wang, H.; Jiang, San Ping; Shao, Zongping (2022)Oxygen evolution reaction (OER) is a key half-reaction in many electrochemical transformations, and efficient electrocatalysts are critical to improve its kinetics which is typically sluggish due to its multielectron-transfer ...
High-Performance Perovskite Composite Electrocatalysts Enabled by Controllable Interface EngineeringXu, Xiaomin ; Pan, Y.; Ge, L.; Chen, Y.; Mao, X.; Guan, D.; Li, M.; Zhong, Yijun ; Hu, Z.; Peterson, V.K.; Saunders, M.; Chen, C.T.; Zhang, H.; Ran, R.; Du, A.; Wang, H.; Jiang, S.P.; Zhou, W.; Shao, Zongping (2021)Single-phase perovskite oxides that contain nonprecious metals have long been pursued as candidates for catalyzing the oxygen evolution reaction, but their catalytic activity cannot meet the requirements for practical ...