Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Solid-Liquid Interfaces II: Electrode Surfaces
O 23.4: Vortrag
Dienstag, 2. April 2019, 11:30–11:45, H5
Strain controlled electrocatalysis during Methanol oxidation on gold thin film — •Xinyan Wu1, Matthias Graf2,3, and Jörg Weißmüller1,3 — 1Institute for Materials Physics and Technology, Hamburg University of Technology, Hamburg — 2Institute for Electronic and Optical Materials, Hamburg University of Technology, Hamburg — 3Insitute for Materials Technology, Helmholtz-Zentrum Geesthacht, Geesthacht
It is well known that one method of enhancing the electrocatalytic performance is to tune the surface strain of nanomaterials, by which the adsorption enthalpies could be modified. Based on theories and experiments towards this mechanism, the underlying strain-adsorption-reactivity relationship gradually becomes acknowledged. However, quantifiable experimental observations of the impact of strain for reactivity of catalyst are still rare, which means this field lacks a quantitative experimental database.
Here we exlpore a method, Dynamic Electro-Chemo-Mechanical analysis (DECMA), in order to investigate the impact of elastic strain on the electrocatalystic methanol oxidation reaction on gold thin film surface. In this approach, a sinusoidal strain is applied on the surface of gold electrode during this whole process, and simultaneously the corresponding reaction current and potential signals caused by this known strain are collected through a lock-in technology. In this way, coupling parameters such as potential-strain and current-strain coefficients will be measured and provide effective information for each reaction step.