SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Nanostructures at Surfaces (joint session O/CPP)
CPP 16.10: Talk
Monday, March 27, 2023, 17:15–17:30, GER 39
Tuning Nanoporous Au Film Formation via High Voltage Electrolysis — •Evelyn Artmann1, Lukas Forschner1, Konstantin M. Schüttler2, Mohammad Al-Shakran1, Timo Jacob1, and Albert K. Engstfeld1 — 1Institute of Electrochemistry, University of Ulm, Germany — 2Institute of Surface Chemistry and Catalysis, University of Ulm, Germany
Nanoporous Au (NPG) films have different properties compared to the bulk material, which opens up new areas of application, such as (electro)catalysis. Usually, NPG films are prepared by dealloying. One disadvantage of this method is that residues of the precursor alloy guest metal can remain in the resulting NPG film, which can have a decisive influence on the electrocatalytic activity of the NPG film.
In this work we report on the preparation of NPG films by high voltage electrolysis (Chem. Phys. Chem., 22 (2021) 2429). In this process, a Au oxide film is first formed on the Au substrate by applying a high positive voltage (between 100 and 540 V), which can subsequently be reduced to NPG. The Au oxide as well as NPG films were characterized by electrochemical methods, as well as (cross-section) SEM and XPS measurements.
Possibilities to selectively modify the resulting NPG films by tuning experimental parameters such as the applied voltage, and electrolyte temperature during HV electrolysis, or the electrolysis time, were systematically investigated. The influence of the reduction method (electrochemical or by H2O2) on the final film structure is discussed.