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O: Fachverband Oberflächenphysik

O 32: Poster: Solid-Liquid Interfaces

O 32.15: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Development of Novel Substrates for In Situ Time-resolved Infrared Spectroscopy of Catalytically Active Interfaces — •Moritz Thun^1,2, Johannes Dittloff^1,2, and Ian D. Sharp^1,2 — ¹Walter Schottky Institute, Technische Universität München, Germany — ²Physics Department, TUM School of Natural Sciences, Technische Universität München, Germany

Electrocatalytic reduction of CO₂ to carbon-based fuels can help to reduce atmospheric greenhouse gas concentrations and provide chemical storage capacities for renewable energies. Copper-based electrocatalysts uniquely offer a tunable range of diverse products. However, understanding and controlling the underlying reaction mechanisms requires in situ probes of the catalyst interface under working conditions. To this end, surface enhanced infrared reflection absorption spectroscopy (SEIRAS) can be used to detect the absorption and desorption of molecules on catalytic interfaces in real time.

Here, we demonstrate a stable substrate with SEIRAS-active surface morphology comprising evaporated Ti/Au metal film on nanostructured black silicon, as confirmed by monitoring the monolayer adsorption of 4-methoxypyridine. Next, Ti/Cu on black silicon, stabilized against surface reconstruction by a thin Nafion layer, allowed us to detect adsorbed CO during CO₂ reduction. We aim to detect additional products of the CO₂ reduction on copper by improving material design, enabling its extension to time-resolved SEIRAS measurements. Furthermore, we are exploring the replacement of Au layers with sputtered metal nitrides on black silicon to achieve versatile SEIRAS activity.

Keywords: SEIRAS; Electrocatalyst; Gold; Copper; Metal Nitride