at Google ScholarTitle data
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
Event: 76th Annual Meeting of the International Society of Electrochemistry
, 7.9.-12.9.2025
, Mainz, Germany.
(Conference item: Conference
,
Poster
)
Abstract in another language
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.
Further data
| Item Type: | Conference item (Poster) |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr.-Ing. Christina Roth Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos Profile Fields > Advanced Fields > Advanced Materials Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Date Deposited: | 13 Nov 2025 08:50 |
| Last Modified: | 13 Nov 2025 08:50 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/95206 |