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Research Article

Crystal-plane-dependent redox reaction on Cu surfaces

Yangsheng Li1,2, Hao Chen1,2, Weijia Wang3, Wugen Huang1,2, Yanxiao Ning1, Qingfei Liu1,2, Yi Cui4, Yong Han3, Zhi Liu3,5, Fan Yang1,3( ), Xinhe Bao1
State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
University of Chinese Academy of Sciences, Beijing 100049, China
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
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Abstract

The dynamic redox process of surface oxide layers on metal surfaces is of great significance for understanding the active phase in catalytic reactions. We studied the formation of surface oxide layers on Cu(111) and Cu(110) in O2, as well as the subsequent reduction by CO using in situ scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). By monitoring and comparing the oxidation process of Cu(111) and Cu(110) surfaces, we found a crystal-plane-dependent reaction mechanism, which also applies to the reduction of surface oxide layers on Cu surfaces. We found XPS Cu spectra cannot be used to identify the various surface oxide layer on Cu surfaces, suggesting their presence in catalytic reactions might have been overlooked. The combination of STM and XPS studies are thus advantageous in identifying surface oxide structures and pinpointing the active phases in the redox process, which paves the way for engineering the catalyst and reaction environment for optimized catalytic performances.

Keywords

in situ STMNAP-XPSsurface oxideCu(111)Cu(110)

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Nano Research
Volume 13 Issue 6,
June 2020
Pages 1677-1685
DOI: 10.1007/s12274-020-2791-z
Cite this article:
Li Y, Chen H, Wang W, et al. Crystal-plane-dependent redox reaction on Cu surfaces. Nano Research, 2020, 13(6): 1677-1685. https://doi.org/10.1007/s12274-020-2791-z
Topics:
Catalysis CopperCrystalsOxidationRedox reactionsScanning tunneling microscopyX-ray photoelectron spectroscopy

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Received: 24 January 2020
Revised: 25 March 2020
Accepted: 04 April 2020
Published: 19 May 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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