Abstract
A sample of palladium nanoparticles with an average size of ~5 nm on the surface of highly oriented pyrolytic graphite (HOPG) was prepared by vacuum deposition. With the use of X-ray photoelectron spectroscopy (XPS), it was found that the interaction of the resulting Pd/HOPG sample with nitrogen dioxide at room temperature and a pressure of 10–6 mbar led to the oxidation of graphite. In this case, palladium particles retained their metallic state. A comparison with the behavior of a palladium sample supported onto HOPG activated by ion etching under similar conditions showed that structural defects on the graphite surface did not play a decisive role in the oxidation of graphene layers. A comparison with the results obtained upon the interaction of NO2 with Pt nanoparticles supported on the HOPG surface was made.
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ACKNOWLEDGMENTS
The studies are conducted using the equipment of the Center of collective use “National Center of Catalyst Research”.
Funding
This work was carried out at the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences within the framework of a state contract (project no. AAAA-A17-117041710078-1).
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Translated by V. Makhlyarchuk
Abbreviations and notation: HOPG, highly oriented pyrolytic graphite; XPS, X-ray photoelectron spectroscopy; STM, scanning tunneling microscopy; Eb, binding energy.
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Smirnov, M.Y., Kalinkin, A.V., Sorokin, A.M. et al. Room Temperature Interaction of NO2 with Palladium Nanoparticles Supported on a Nonactivated Surface of Highly Oriented Pyrolytic Graphite (HOPG). Kinet Catal 61, 907–911 (2020). https://doi.org/10.1134/S0023158420060142
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DOI: https://doi.org/10.1134/S0023158420060142