Perovskite With Tunable Active-Sites Oxidation State by High-Valence W for Enhanced Oxygen Evolution Reaction

Frontiers in Chemistry

Chemistry

Jiabiao Yan¹  Mingkun Xia¹  Chenguang Zhu¹  Fanglin Du¹  Dawei Chen² 

[1] College of Material Science and Engineering, Qingdao University of Science and Technology, Qingdao, China;null;

关键词: perovskite oxides;    atom substitution;    non-precious metal catalyst;    oxygen evolution reaction;    electrostatic spinning;   

DOI  :  10.3389/fchem.2021.809111

 received in 2021-11-04, accepted in 2021-11-18,  发布年份 2022

来源: Frontiers

【 摘 要 】

Perovskite oxides have been established as a promising kind of catalyst for alkaline oxygen evolution reactions (OER), because of their regulated non-precious metal components. However, the surface lattice is amorphous during the reaction, which gradually decreases the intrinsic activity and stability of catalysts. Herein, the precisely control tungsten atoms substituted perovskite oxides (Pr0.5Ba0.5Co1-xWxO3-δ) nanowires were developed by electrostatic spinning. The activity and Tafel slope were both dependent on the W content in a volcano-like fashion, and the optimized Pr0.5Ba0.5Co0.8W0.2O3-δ exhibits both excellent activity and superior stability compared with other reported perovskite oxides. Due to the outermost vacant orbitals of W6+, the electronic structure of cobalt sites could be efficiently optimized. Meanwhile, the stronger W-O bond could also significantly improve the stability of latticed oxide atoms to impede the generation of surface amorphous layers, which shows good application value in alkaline water splitting.

【 授权许可】

Unknown   
Copyright © 2022 Yan, Xia, Zhu, Chen and Du.