SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Poster: Solid-Liquid Interfaces

O 69.6: Poster

Mittwoch, 29. März 2023, 18:00–20:00, P2/EG

CO2 Electroreduction Reactions at Gold and Copper Electrodes in Ionic Liquids — •Björn Ratschmeier, Gina Ross, and Björn Braunschweig — University Münster, Institute of Physical Chemistry, Münster, Germany

Room-temperature ionic liquids (RTIL) can play a major role in CO2 reduction reactions in mitigation of existing problems of aqueous electrolytes, such as high overpotentials and product selectivity. In this context, we have studied the influence of Au(111), Cu(111) single crystals, as well as Cu enriched Au(111) electrodes prepared by Cu underpotential deposition with Cu coverages of 1/3, 2/3 and 3/3, in 1-butyl-3-methylimidazolium trifluorosulfonylimide [BMIM][NTf2] for CO2RR. For Au and Cu enriched Au electrodes we observed high selectivity for H2 and CO formation, with onset potentials at around -1.0 V vs SHE and a H2/CO syngas ratio between 0.2-0.4, whereas for Cu only H2 and traces of CO were detected until 1.5 V. By increasing the degrees of coverage of Cu on Au, we were able to modulate the syngas ratio to an optimum ratio of about 1.8 for a monolayer of Cu on Au(111), which approaches the ideal ratio of 2 for Fischer-Tropsch synthesis of hydrocarbons.