Abstract
Understanding the dynamic changes of catalytically active nanostructures (NSs) under reaction conditions is a pivotal challenge in catalysis research, which has been intensively studied on metal catalysts, but less on oxide NSs. Here, we synthesized two-dimensional (2D) FeO NSs and thin films on Au(111) and studied their oxidation process in O2 from ultrahigh vacuum to near-ambient-pressure (NAP) conditions, using the combination of in-situ NAP scanning tunneling microscopy and x-ray photoelectron spectroscopy. Our studies revealed atomic details on the transition process from the FeO bilayer to the FeO2 tri-layer on Au(111). Further, we found FeO2 NSs and thin layers are metastable on Au(111) and would undergo a three-dimensional phase change upon further thermal treatments. Our study has thus provided insight on the structural dynamics of 2D iron oxide under reaction conditions and enabled further understanding on the design of the oxide-metal interface.
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