Scandium and phosphorus co-doped perovskite oxides as high-performance electrocatalysts for the oxygen reduction reaction in an alkaline solution. (15th February 2020)

• Record Type: Journal Article
• Authors: Xu, Meigui; Sun, Hainan; Wang, Wei; Shen, Yujuan; Zhou, Wei; Wang, Jun; Chen, Zhi-Gang; Shao, Zongping
• Is Part Of: Journal of materials science & technology. Volume 39(2020)
• Page Start: 22
• Page End: 27
• Publication Date: 2020-02-15
• Subjects: Oxygen reduction reaction -- Perovskite oxide -- Co-doping -- Electrocatalyst -- Synergetic effect; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2019.09.007
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: 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 (La0.8 Sr0.2 Mn0.95 Sc0.025 P0.025 O3- 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 La0.8 Sr0.2 MnO3- 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.