电催化剂
氧气
化学
析氧
过电位
X射线吸收精细结构
无机化学
化学工程
电化学
电极
有机化学
物理化学
光谱学
工程类
量子力学
物理
作者
Xiàn Yáng,Jun Cheng,Hao Li,Yang Xu,Weifeng Tu,Junhu Zhou
标识
DOI:10.1016/j.cej.2023.142745
摘要
The development of low-cost, efficient and robust non-precious metal electrocatalysts for acidic oxygen evolution (OER) is a major challenge. A novel self-supported N-doped hierarchical Co3O4 (3D Co3O4/NC-250) electrocatalyst with abundant oxygen vacancies was prepared by a facile carbonization-oxidation process. XAFS and EPR results clarified that N doping regulated electronic state of central Co atom to generate abundant oxygen vacancies, which activated lattice oxygen in the water oxidation process. The key intermediate O*O was observed via in-situ ATR-FTIR, providing direct evidence for LOM mechanism on active oxygen vacancy sites. DFT calculations showed that LOM mechanism on oxygen vacancy sites was conducive to reduce adsorption free energy of oxygen-containing intermediates in limiting steps of acidic OER process. The as-prepared 3D Co3O4/NC-250 electrocatalyst exhibited ultra-high OER performance with a low overpotential of 225 mV at 10 mA cm−2 in acidic media. This study provided a new insight to rational design of efficient transition metal-based electrocatalysts for acidic OER.
科研通智能强力驱动
Strongly Powered by AbleSci AI