尖晶石
催化作用
氧气
钙钛矿(结构)
X射线光电子能谱
过渡金属
X射线吸收光谱法
化学
金属
格子(音乐)
化学物理
材料科学
原子单位
结晶学
化学工程
吸收光谱法
物理
冶金
工程类
有机化学
量子力学
生物化学
声学
作者
Xiyang Wang,Ziye Pan,Xuefeng Chu,Keke Huang,Yang Cong,Rui Cao,Ritimukta Sarangi,Liping Li
标识
DOI:10.1002/anie.201905543
摘要
Surface lattice oxygen in transition-metal oxides plays a vital role in catalytic processes. Mastering activation of surface lattice oxygen and identifying the activation mechanism are crucial for the development and design of advanced catalysts. A strategy is now developed to create a spinel Co3 O4 /perovskite La0.3 Sr0.7 CoO3 interface by in situ reconstruction of the surface Sr enrichment region in perovskite LSC to activate surface lattice oxygen. XAS and XPS confirm that the regulated chemical interface optimizes the hybridized orbital between Co 3d and O 2p and triggers more electrons in oxygen site of LSC transferred into lattice of Co3 O4 , leading to more inactive O2- transformed into active O2-x . Furthermore, the activated Co3 O4 /LSC exhibits the best catalytic activities for CO oxidation, oxygen evolution, and oxygen reduction. This work would provide a fundamental understanding to explain the activation mechanism of surface oxygen sites.
科研通智能强力驱动
Strongly Powered by AbleSci AI