Atomic-Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co3O4/La0.3Sr0.7CoO3

Wang, Xiyang; Pan, Ziye; Chu, Xuefeng; Huang, Keke; Cong, Yingge; Cao, Rui; Sarangi, Ritimukta; Li, Liping; Li, Guangshe; Feng, Shouhua

doi:10.1002/anie.201905543

Title: Atomic-Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co₃O₄/La_0.3Sr_0.7CoO₃

Journal Article · Sat Jun 22 00:00:00 EDT 2019 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201905543· OSTI ID:1546793

^[1]; Pan, Ziye ^[1]; Chu, Xuefeng ^[1]; Huang, Keke ^[1]; Cong, Yingge ^[1]; Cao, Rui ^[2]; Sarangi, Ritimukta ^[2]; Li, Liping ^[1]; Li, Guangshe ^[1];

^[1]

Jilin Univ., Changchun (China)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

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 La_0.3Sr_0.7CoO₃ 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 O^2- transformed into active O^2-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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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC02-76SF00515; 21427802; 21671076; 21621001; 21831003; 3102018bzc007; 10183201816

OSTI ID:: 1546793

Journal Information:: Angewandte Chemie (International Edition), Vol. 58, Issue 34; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 94 works

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Enhanced catalytic activity of nanostructured, A-site deficient (La _0.7 Sr _0.3 ) _0.95 (Co _0.2 Fe _0.8 )O _3−δ for SOFC cathodes Celikbilek, Ozden; Thieu, Cam-Anh; Agnese, Fabio Journal of Materials Chemistry A, Vol. 7, Issue 43 https://doi.org/10.1039/c9ta07697b	journal	January 2019

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
electron transfer
electronic structure
perovskite
spinels
surface lattice oxygen

Title: Atomic-Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co3O4/La0.3Sr0.7CoO3

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Title: Atomic-Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co₃O₄/La_0.3Sr_0.7CoO₃