Scandium and phosphorus co-doped perovskite oxides as high-performance electrocatalysts for the oxygen reduction reaction in an alkaline solution

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（4）
• 页码范围: 22-27
• 页数: 6页
• 语种: 英文

摘要

The requirement for a sustainable and renewable energy has inspired substantial interests in designing and developing earth-abundant and high-effectiveness electrocatalysts/electrodes for fuel cells and metal-air batteries,in which oxygen reduction reaction (ORR) plays a crucial role.Perovskite oxides have acquired rapid attention as ORR electrocatalysts to replace noble-metal-based catalysts owing to their intrinsic electrocatalytic activity,compositional and structural flexibility.Herein,we report a new Sc and P co-doped perovskite oxide (La0.8Sr0.2Mn0.95Sc0.025P0.025O3-δ,LSMSP) as an active and robust electrocatalyst for the ORR in an alkaline solution.LSMSP electrocatalyst shows superior ORR activity and stability than those of pristine La0.8Sr0.2MnO3-δ (LSM),Sc-doped LSM and P-doped LSM due to the optimized average valence of Mn ions,the large surface area,the smaller particle size and the synergetic effect introduced by the co-doping.Moreover,compared to the benchmark Pt/C electrocatalyst,LSMSP electrocatalyst displays comparable ORR activity and superior durability.These above results suggest that the co-doping strategy of Sc and P into perovskites is a useful method to design high-performance electrocatalysts for the ORR,which can be used in other electrocatalysis-based applications.