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Atomic‐Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co 3 O 4 /La 0.3 Sr 0.7 CoO 3
Author(s) -
Wang Xiyang,
Pan Ziye,
Chu Xuefeng,
Huang Keke,
Cong Yingge,
Cao Rui,
Sarangi Ritimukta,
Li Liping,
Li Guangshe,
Feng Shouhua
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201905543
Subject(s) - spinel , catalysis , oxygen , perovskite (structure) , x ray photoelectron spectroscopy , transition metal , x ray absorption spectroscopy , lattice (music) , metal , atomic units , materials science , chemical physics , chemistry , chemical engineering , crystallography , absorption spectroscopy , physics , metallurgy , biochemistry , organic chemistry , quantum mechanics , acoustics , engineering
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 Co 3 O 4 /perovskite La 0.3 Sr 0.7 CoO 3 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 Co 3 O 4 , leading to more inactive O 2− transformed into active O 2− x . Furthermore, the activated Co 3 O 4 /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.