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O: Fachverband Oberflächenphysik
O 91: 2D materials beyond graphene: TMDCs, silicene and relatives III
O 91.10: Talk
Thursday, March 15, 2018, 12:45–13:00, MA 043
Photocatalytic properties of MoS2 membranes — •Matthias Golibrzuch1, Elmar Mitterreiter1,2, Eric Parzinger1,2, Max Stelzer3, Franz Kreupl3, Joel Ager III4,5, Alexander Holleitner1,2, and Ursula Wurstbauer1,2 — 1Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany — 2Am Coulombwall 4a — 3Department of Hybrid Electronic Systems, Technische Universität München, 80333 München, Germany — 4Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory — 5Deptartment of Materials Science and Engineering, University of California, Berkeley, CA 94720
MoS2 is a fascinating two-dimensional van der Waals material with outstanding electronic, optical and catalytic properties. Its high optical absorption up to 15% in the visible range for monolayers together with catalytic activity and photocatalytic stability makes single-layer MoS2 a very promising material for sunlight driven photocatalytic applications such as photocatalytic hydrogen evolution (HER).
We demonstrate the photocatalytic activity regarding HER of exfoliated single- and few-layer MoS2 immersed in an acid electrolyte by cyclic voltammetry. We observe an increased catalytic activity of MoS2 with decreasing number of layers. In particular, monolayers exhibit high current densities, low onset potentials and high turnover frequencies. Edge sites and defects show higher activities than the basal plane. We furthermore demonstrate that HER activity is increased by illumination in the visible range.