Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.38: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Investigation of the Hydrogenation of Graphene on Ni(111) via Temperature Programmed X-Ray Photoemission Spectroscopy and Temperature Programmed Desorption — •Florian Späth, Wei Zhao, Karin Gotterbarm, Christoph Gleichweit, Hans-Peter Steinrück, and Christian Papp — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

The fundamental understanding of the reaction of hydrogen with graphene is of paramount importance for hydrogen-based energy storage and for tailoring the properties of graphene through chemical modification, and thus for future applications in hydrogen storage and semiconductor industries. Low defect graphene is prepared on Ni(111) by chemical vapor deposition; subsequent exposure to atomic hydrogen yields hydrogenated graphene. The hydrogenation process is thoroughly investigated with X-Ray Photoelectron Spectroscopy to gain insight in the chemical modification. The dehydrogenation process is investigated with Temperature Programmed X-Ray Photoemission Spectroscopy and Temperature Programmed Desorption. We gain detailed mechanistic insights and observe a two-step dehydrogenation independently with both methods. Furthermore, we determined the hydrogen saturation coverage, which corresponds to a full single-side hydrogenated layer. Additionally, we present a model for both the hydrogenation and dehydrogenation, and deduce a strong dependency of the hydrogen storage capacity on the substrate. A comparison to quasi free-standing graphene will be discussed.