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Title: On the promotion of catalytic reactions by surface acoustic waves
Author: von Boehn, Bernhard
Foerster, Michael
von Boehn, Moritz
Prat, Jordi
Macià Bros, Ferran
Casals, Blai
Waqas Khaliq, Muhammad
Hernández Mínguez, Alberto
Aballe, L.
Imbihl, Ronald
Keywords: Ones acústiques de superfície
Acoustic surface waves
Issue Date: 30-Jul-2020
Publisher: Wiley-VCH
Abstract: Surface acoustic waves (SAW) allow to manipulate surfaces with potential applications in catalysis,sensor and nanotechnology.SAWswere shown to cause astrong increase in catalytic activity and selectivity in many oxidation and decomposition reactions on metallic and oxidic catalysts. However,the promotion mechanism has not been unambiguously identified. Using stroboscopic X-ray photoelectron spectro-microscopy, we were able to evidence asub-nano-second work function change during propagation of 500 MHz SAWs on a9nm thick platinum film. We quantify the work function change to 455 meV.Such asmall variation rules out that electronic effects due to elastic deformation (strain) play amajor role in the SAW-induced promotion of catalysis.In asecond set of experiments,SAW-induced intermixing of afive monolayers thick Rh film on top of polycrystalline platinum was demonstrated to be due to enhanced thermal diffusion caused by an increase of the surface temperature by about 75 K when SAWs were excited. Reversible surface structural changes are suggested to be amajor cause for catalytic promotion.
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It is part of: Angewandte Chemie-International Edition, 2020, vol. 59, num. 45, p. 20224-20229
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ISSN: 1433-7851
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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