Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 65: Solid-Liquid Interfaces: Reactions and Electrochemistry III

O 65.1: Talk

Wednesday, March 19, 2025, 15:00–15:15, H6

Potential Pulsed CO2 Reduction Reaction on Polycrystalline Copper Electrodes Studied with Operando Plasmonic Interface Analysis — •Hagen Übele, Katharina Krischer, and Moritz Josef Feil — Chemische Physik fern des Gleichgewichts Technische Universität München, München, Deutschland

This contribution highlights the use of polished polycrystalline Cu electrodes for the CO2 reduction reaction. By applying time-periodic potential pulses, long-term stability and enhanced selectivity towards hydrocarbon products like methane, ethylene, and ethanol are achieved. These methods rival the performance of nano-structured oxide-derived catalysts or Cu single crystal electrodes while improving electrode longevity.

Operando monitoring is conducted using a plasmonic interface analysis technique with a time resolution of 100 ms. This enables real-time tracking of the Cu oxidation state and the nano-morphology of the electrode surface during potential pulses. The study demonstrates that optimized pulsing protocols can significantly extend the stability of Cu electrodes without the need for pre-manufactured nanostructures.

Keywords: Electrochemistry; CO2 Reduction; Plasmonics