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Zhu B, Huang W, Lin H, Feng H, Palotás K, Lv J, Ren Y, Ouyang R, Yang F. Vacancy Ordering in Ultrathin Copper Oxide Films on Cu(111). J Am Chem Soc 2024; 146:15887-15896. [PMID: 38825776 DOI: 10.1021/jacs.4c02424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Oxide thin films grown on metal surfaces have wide applications in catalysis and beyond owing to their unique surface structures compared to their bulk counterparts. Despite extensive studies, the atomic structures of copper surface oxides on Cu(111), commonly referred to as "44" and "29", have remained elusive. In this work, we demonstrated an approach for the structural determination of oxide surfaces using element-specific scanning tunneling microscopy (STM) imaging enhanced by functionalized tips. This approach enabled us to resolve the atomic structures of "44" and "29" surface oxides, which were further corroborated by noncontact atomic force microscopy (nc-AFM) measurements and Monte Carlo (MC) simulations. The stoichiometry of the "44" and "29" frameworks was identified as Cu23O16 and Cu16O11, respectively. Contrary to the conventional hypothesis, we observed ordered Cu vacancies within the "44" structure manifesting as peanut-shaped cavities in the hexagonal lattice. Similarly, a combination of Cu and O vacancies within the "29" structure leads to bean-shaped cavities within the pentagonal lattice. Our study has thus resolved the decades-long controversy on the atomic structures of "44" and "29" surface oxides, advancing our understanding of copper oxidation processes and introducing a robust framework for the analysis of complex oxide surfaces.
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Affiliation(s)
- Bowen Zhu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Wugen Huang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Haiping Lin
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
| | - Hao Feng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | | | - Jiayu Lv
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yihui Ren
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Runhai Ouyang
- Materials Genome Institute, Shanghai University, Shanghai 200444, China
| | - Fan Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Therrien AJ, Groden K, Hensley AJ, Schilling AC, Hannagan RT, Marcinkowski MD, Pronschinske A, Lucci FR, Sykes ECH, McEwen JS. Water activation by single Pt atoms supported on a Cu2O thin film. J Catal 2018. [DOI: 10.1016/j.jcat.2018.04.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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