Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 3: Layer Properties: Electronic, Optical and Mechanical Properties
DS 3.9: Vortrag
Montag, 1. April 2019, 11:45–12:00, H39
Visualization of Engineered Catalytic Hydrogen Evolution Sites on Molybdenum Dichalcogenides under Reaction Conditions — •Beatrice Sala2, Elmar Mitterreiter1,2, Yunchang Liang3, Matthias Golibrzuch2, David McLaughlin3, Christoph Csoklich3, Alexander Holleitner1,2, Ursula Wurstbauer1,2, and Aliaksandr S. Bandarenka1,3,4 — 1Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany — 2Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany — 3Physik-Department ECS, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — 4Catalysis Research Center TUM, Ernst-Otto-Fischer-Straße 1, 85748 Garching, Germany
2D transition metal dichalcogenides are abundant and cost effective (co-)catalysts with tunable physical properties. In this respect, these materials are suitable for reactions related to energy provision, for instance hydrogen evolution reaction (HER). It is vital to understand which surface sites are highly active to improve the catalytic behavior of those materials. Here, we visualize catalytically active sites at the surface of molybdenum disulfide (MoS_2) with lateral resolution on the nanometer scale by means of electrochemical STM. The edges of single MoS_2 flakes show high catalytic activity, whereas their surfaces are inactive. Furthermore, we demonstrate that the inert basal plane of these materials can be activated towards the HER with the focused beam of a helium ion microscope. Thus, we show the possibility to generate active sites with a spatial resolution below a few nanometer.