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Asymmetric oxygen vacancies: the intrinsic redox active sites in metal oxide catalysts

Research output: Contribution to journalArticle

Author(s)

Kai Yu, Lan-Lan Lou, Shuangxi Liu, Wuzong Zhou

School/Research organisations

Abstract

To identify the intrinsic active sites in oxides or oxide supported catalysts is a research frontier in the fields of heterogeneous catalysis and material science. In particular, the role of oxygen vacancies on the redox properties of oxide catalysts is still not fully understood. Herein, some relevant research dealing with M1–O–M2 or M1–□–M2 linkages as active sites in mixed oxides, in oxide supported single‐atom catalysts, and at metal/oxide interfaces of oxide supported nanometal catalysts for various reaction systems is reviewed. It is found that the catalytic activity of these oxides not only depends on the amounts of oxygen vacancies and metastable cations but also shows a significant influence from the local environment of the active sites, in particular, the symmetry of the oxygen vacancies. Based on the recent progress in the relevant fields, an “asymmetric oxygen vacancy site” is introduced, which indicates an oxygen vacancy with an asymmetric coordination of cations, making oxygen “easy come, easy go,” i.e., more reactive in redox reactions. The establishment of this new mechanism would shed light on the future investigation of the intrinsic active sites in oxide and oxide supported catalysts.
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Details

Original languageEnglish
Article number1901970
Number of pages8
JournalAdvanced Science
VolumeEarly View
Early online date5 Dec 2019
DOIs
Publication statusE-pub ahead of print - 5 Dec 2019

    Research areas

  • Asymmetric oxygen vacancies, Redox active sites, Mixed oxides, Single-atom catalysts, Interfacial catalysts

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