Atomic‐Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co3O4/La0.3Sr0.7CoO3. (18th July 2019)

• Record Type: Journal Article
• Authors: Wang, Xiyang; Pan, Ziye; Chu, Xuefeng; Huang, Keke; Cong, Yingge; Cao, Rui; Sarangi, Ritimukta; Li, Liping; Li, Guangshe; Feng, Shouhua
• Is Part Of: Angewandte Chemie. Volume 131:Number 34(2019)
• Page Start: 11846
• Page End: 11851
• Publication Date: 2019-07-18
• Subjects: Elektronentransfer -- Elektronische Struktur -- Perowskite -- Spinelle -- Oberflächensauerstoff; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201905543
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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 O 2− transformed into active O 2− 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. Abstract : Aktivierung von Oberflächensauerstoff : Eine in situ generierte Co3 O4 /La0.3 Sr0.7 CoO3 ‐Grenzfläche bewirkt, dass mehr Elektronen in der Sauerstoffposition eines Perowskit‐LSC in das Co3 O4 ‐Gitter übertragen werden. Damit werden mehr inaktive O 2− ‐ in aktive O 2− x ‐Spezies überführt, was die Aktivierungsenergiebarrieren bei Reaktionen anionischer Oberflächen‐Sauerstoffspezies effizient herabsetzt.