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Hawe, Philipp ; Hartwig, Carl Eric ; Roth, Christina ; Moos, Ralf:
Modular Cell Design for Operando XAS : Parameter Transfer and Cu/Ag bimetallic electrocatalyst investigation in CO₂ reduction.
2025
Veranstaltung: 76th Annual Meeting of the International Society of Electrochemistry
, 7.9.-12.9.2025
, Mainz, Germany.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Poster
)
Abstract
Operando X-ray Absorption Spectroscopy (XAS) provides crucial insights into the electronic and structural evolution of electrocatalysts under working conditions, particularly in CO₂ reduction reaction (CO₂RR). However, the challenge of maintaining consistency between different electrochemical setups often limits the direct comparison of results. In this study, we present a modular electrochemical cell design optimized for operando XAS, enabling seamless transfer of key reaction parameters - such as electrolyte/gas flow dynamics, current density and temperature influence - from larger scale established by Jännsch et al. systems to miniaturized setups suitable for synchrotron-based XAS measurements. Using the basis proposed by Hoffmann et al., further improvements in terms of faster handling and the suitability for both transmission and fluorescence measurements have been made.
Utilising this modular approach, the behaviour of various catalysts known to be capable of forming C2+ products is investigated, based on Cu inherent active sites that drive CO₂RR towards valuable hydrocarbon and oxygenate products. To this end, the electrolysis of various Cu-Ag combinations in 1M KHCO3, ranging from 4 wt.% Cu@ N-SiCN to 4 wt.% Ag @ N-SiCN substrates on a GDE with a loading of 2 mg·cm-2 active species (Ag/Cu), was studied. The 4 wt.% Cu catalyst exhibited, as anticipated, a range of products with high Faraday efficiency towards formate. However, the addition of 1 wt.% Ag to the catalyst resulted in a shift in selectivity towards the production of CO. With increasing Ag content, a shift in selectivity was observed, resulting in Ag-specific behaviour characterised by sole CO2 to CO conversion. The applied potential played a pivotal role in the products obtained, particularly in the presence of mixed catalyst phases. Specifically, it was observed that by increasing the applied potential from -1.45 V to -1.65 V vs. Ag/AgCl higher potentials, the yield of formate could be enhanced relative to that of CO.
Weitere Angaben
| Publikationsform: | Veranstaltungsbeitrag (Poster) |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverfahrenstechnik > Lehrstuhl Werkstoffverfahrenstechnik - Univ.-Prof. Dr.-Ing. Christina Roth Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos Profilfelder > Advanced Fields > Neue Materialien Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Materialzentrum - BayMAT |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 13 Nov 2025 08:50 |
| Letzte Änderung: | 13 Nov 2025 08:50 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/95206 |