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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session: Interface-dominated phenomena - Interactions at Interfaces
MM 23.1: Vortrag
Dienstag, 17. März 2020, 11:45–12:00, IFW A
Elastic Strain Effect in Electrocatalysis during Methanol Oxidation Reaction on Gold/Platinum Thin Films — •Xinyan Wu1 and Jörg Weißmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
It is well known that one effective method of enhancing the electrocatalytic performance is to tune the surface strain of nanomaterials, by which the adsorption enthalpies could be modified. 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 explore 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 and platinum thin film surface in alkaline solutions. In this way, coupling parameters such as potential-strain & and current-strain Λ coefficients are measured and suggest that tensile strain decreases the adsorption energy thus bring a strong binding between OHads and electrode. However, this stronger binding plays different roles on Au and Pt electrodes, which revealed different strain modulation mechanism in these two systems during methanol oxidation reaction(MOR). Pt electrode responses more strongly and oppositely as Au electrode towards external tensile strain, namely a compressive stain effect is more favourable on Pt electrode.