SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 94: Poster Session VII: Poster to Mini-Symposium: Electrified solid-liquid interfaces II
O 94.5: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Characterization of excitonic behaviour of MoS2 on gold electrode by final state resonant sum frequency spectroscopy — •tao yang, erik pollmann, marika schleberger, yujin tong, and richard kramer campen — University of Duisburg-Essen, Faculty of Physics, 47057 Duisburg, Germany
Two dimensional (2D) materials are promising candidate electrocatalysts for the hydrogen evolution reaction (HER) because of their large surface area and tunable electronic properties. Particularly MoS2, a transition metal dichalcogenide, has been intensively studied in this context showing comparable efficiency for the HER as Pt. While continuous breakthroughs in HER activity of MoS2 have been achieved, less attention has been devoted to the mechanistic investigation, e.g., charge transfer between a metal electrode and the MoS2. Here we use final state resonant sum frequency spectroscopy to study the optical response of MoS2 exfoliated on a gold electrode in aqueous solution as a function of applied bias. The results show the evolution of the A and B excitons with electron doping. Together with Raman and electrochemical characterization, the current study provides important insights into understanding the relationship between electronic structure, atomic configuration and electron transfer at metal/MoS2/aqueous electrolyte interface.