期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 34, 页码 11720-11725出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201905543
关键词
electron transfer; electronic structure; perovskite; spinels; surface lattice oxygen
资金
- National Natural Science Foundation of China [21427802, 21671076, 21621001, 21831003]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT)
- Fundamental Research Funds for the Central Universities [3102018bzc007]
- Interdisciplinary Research Grant for PhDs of Jilin University [10183201816]
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 Co3O4 /perovskite La0.3Sr0.7CoO3 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 Co3O4 , leading to more inactive O2- transformed into active O2-x. Furthermore, the activated Co3O4/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.
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