Reversible Hydrogenation of Graphene on Ni(111)—Synthesis of “Graphone” |
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| Authors: | Dr. Wei Zhao Julian Gebhardt Florian Späth Karin Gotterbarm Christoph Gleichweit Prof. Dr. Hans‐Peter Steinrück Prof. Dr. Andreas Görling Dr. Christian Papp |
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| Affiliation: | 1. Lehrstuhl für Physikalische Chemie II, Universit?t Erlangen‐Nürnberg, Egerlandstr. 3, 91058 Erlangen (Germany);2. Lehrstuhl für Theoretische Chemie, Universit?t Erlangen‐Nürnberg, Egerlandstr. 3, 91058 Erlangen (Germany) |
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| Abstract: | Understanding the adsorption and reaction between hydrogen and graphene is of fundamental importance for developing graphene‐based concepts for hydrogen storage and for the chemical functionalization of graphene by hydrogenation. Recently, theoretical studies of single‐sided hydrogenated graphene, so called graphone, predicted it to be a promising semiconductor for applications in graphene‐based electronics. Here, we report on the synthesis of graphone bound to a Ni(111) surface. We investigate the formation process by X‐ray photoelectron spectroscopy (XPS), temperature‐programmed desorption (TPD), and density‐functional theory calculations, showing that the hydrogenation of graphene with atomic hydrogen indeed leads to graphone, that is, a hydrogen coverage of 1 ML (4.2 wt %). The dehydrogenation of graphone reveals complex desorption processes that are attributed to coverage‐dependent changes in the activation energies for the associative desorption of hydrogen as molecular H2. |
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| Keywords: | dehydrogenation density functional calculations graphene graphone hydrogenation X‐ray photoelectron spectroscopy |
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