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Title: Redox Properties of Cu2O(100) and (111) Surfaces

Journal Article · · Journal of Physical Chemistry. C

Intense research efforts are directed towards Cu and Cu2O based catalysts as they are viewed as potential replacements for noble metal catalysts. However, applications are complicated by deactivation, e.g. through complete oxidation to CuO. Despite the importance of the redox processes for Cu2O catalysts a molecular level understanding of the deactivation process is still lacking. Therefore we study the initial stages of oxidization of well-defined Cu2O bulk single crystals of (100) and (111) termination by means of synchrotron radiation X-ray photoemission spectroscopy (XPS) and scanning tunneling microscopy (STM). Exposure of the (100) surface to 1 mbar O2 at 25 °C result in formation of a 1.0 monolayers (ML) CuO surface oxide. The surface is also covered by 0.7 ML OH groups from unavoidable trace moisture in reaction gas. In contrast, neither hydroxylation nor oxidation was observed on the (111) surface under similar exposure conditions. On (111) the formation of CuO did only commence after annealing to ~400 °C in 1 mbar O2, highlighting the different character of the two surfaces. Annealing of the (100) surface, under ultrahigh vacuum conditions, to temperatures up to ~225 °C resulted in removal of the OH groups (0.46 ML decrease) at a rate similar to a detected increase in CuO coverage (0.45 ML increase), suggesting the reaction path 2OHadsorbed + Cu2Osolid → H2Ogas + 2CuOsolid. STM was used to correlate the observed changes in surface chemistry with surface morphology, confirming the surface hydroxylation and CuO formation. The STM analysis showed dramatic changes in surface morphology demonstrating a high mobility of the active species under reaction conditions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1492774
Report Number(s):
BNL-210924-2019-JAAM
Journal Information:
Journal of Physical Chemistry. C, Vol. 122, Issue 50; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (2)

Morphological and Kinetic Insights into Cu 2 O–CuO Oxidation journal September 2019
Preparation and photoelectric properties of praseodymium-doped cuprous oxide thin films journal January 2020

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