Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Focus Session: Catalysis at Liquid Interfaces
O 45.2: Vortrag
Mittwoch, 7. September 2022, 15:30–15:45, H4
Gallium droplets on nanostructured surfaces as matrix material for supported liquid metal solutions — •André Hofer, Nicola Taccardi, Peter Wasserscheid, and Julien Bachmann — FAU Erlangen, Germany
A large variety of organic compounds are produced industrially using a dehydrogenation reaction which removes H2 from a molecule and hence converts it into a more reactive and valuable product. Usually, such a reaction is endothermic and needs to be catalysed or performed at elevated temperatures. Our approach for improving the availability of the catalyst is the utilization of supported catalytically active liquid metal solutions (SCALMS). Here, the catalytically active material is dissolved in a dynamic liquid matrix, protecting it from undesired deactivation. Ga is used in our approach as the matrix material due to its outstanding properties. So far, SCALMS catalysis has been performed with very limited control of particle sizes. Here, we present a model system to determine the fundamental kinetic parameters of SCALMS reactions. We fabricate highly ordered, nanostructured substrates by electrochemical anodization of Al, generating indentations in a hexagonal arrangement with a tunable diameter. These substrates are coated with acidic or alkaline metal oxides by ALD to affect the surface tension and wetting behaviour of the Ga droplets. Subsequently, a Ga complex is spin-coated from organic solution on the surfaces and the elementary Ga droplets are obtained upon thermal treatment. Parameters relevant to SCALMS application of the surface fabricated are investigated systematically as they depend on the preparative parameters.