Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts
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, s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advanced Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/advs.201901970 |
| _version_ | 1819209063609663488 |
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| author | Kai Yu Lan‐Lan Lou Shuangxi Liu Wuzong Zhou |
| author_facet | Kai Yu Lan‐Lan Lou Shuangxi Liu Wuzong Zhou |
| author_sort | Kai Yu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-23T05:49:20Z |
| format | Article |
| id | doaj.art-7183edcbf0444c15b15ffed20fc2fa12 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-12-23T05:49:20Z |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-7183edcbf0444c15b15ffed20fc2fa122022-12-21T17:58:00ZengWileyAdvanced Science2198-38442020-01-0172n/an/a10.1002/advs.201901970Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide CatalystsKai Yu0Lan‐Lan Lou1Shuangxi Liu2Wuzong Zhou3MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Technology for Complex Trans‐Media Pollution College of Environmental Science and Engineering Nankai University Tianjin 300350 ChinaSchool of Materials Science and Engineering & National Institute of Advanced Materials Nankai University Tianjin 300350 ChinaSchool of Materials Science and Engineering & National Institute of Advanced Materials Nankai University Tianjin 300350 ChinaSchool of Chemistry University of St Andrews St Andrews KY16 9ST UKAbstract 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.https://doi.org/10.1002/advs.201901970asymmetric oxygen vacanciesinterfacial catalystsmixed oxidesredox active sitessingle‐atom catalysts |
| spellingShingle | Kai Yu Lan‐Lan Lou Shuangxi Liu Wuzong Zhou Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts Advanced Science asymmetric oxygen vacancies interfacial catalysts mixed oxides redox active sites single‐atom catalysts |
| title | Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts |
| title_full | Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts |
| title_fullStr | Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts |
| title_full_unstemmed | Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts |
| title_short | Asymmetric Oxygen Vacancies: the Intrinsic Redox Active Sites in Metal Oxide Catalysts |
| title_sort | asymmetric oxygen vacancies the intrinsic redox active sites in metal oxide catalysts |
| topic | asymmetric oxygen vacancies interfacial catalysts mixed oxides redox active sites single‐atom catalysts |
| url | https://doi.org/10.1002/advs.201901970 |
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