KIT | KIT-Bibliothek | Impressum | Datenschutz

Dynamic vs. Stationary Analysis of Electrochemical Carbon Dioxide Reduction: Profound Differences in Local States

Dorner, Inga ORCID iD icon 1; Röse, Philipp ORCID iD icon 1; Krewer, Ulrike ORCID iD icon 1
1 Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1), Karlsruher Institut für Technologie (KIT)

Abstract:

Electrochemical CO$_2$ reduction is crucial for mitigating emissions by converting them into valuable chemicals. Stationary methods suffer from drawbacks like gas bubble distortion and long measurement times. However, dynamic cyclovoltammetry in rotating disc electrode setups is employed to infer performance. This study uncovers limitations when applying this approach to CO$_2$ reduction in aqueous electrolyte. Here, we present a model-based analysis considering electrochemical reactions, species and charge transport, and chemical carbonation. Experimental and simulated potential cycles demonstrate scan rate dependence, significantly deviating from stationary curves at low rotation rates (50 rpm). Such low rotation rates mimic real diffusion layer thicknesses in practical cell systems, thus a transport impact can be expected also on cell level. This behavior arises from slow transport and carbonation, causing time-dependent CO$_2$ depletion and electrolyte buffering. Dynamic investigation reveals strong species transport effects. Furthermore, dynamic operation enhances Faradaic efficiency due to a shift in the carbonate reaction system, favoring electrochemical CO$_2$ consumption over chemical CO$_2$ consumption. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000164791
Veröffentlicht am 28.11.2023
Originalveröffentlichung
DOI: 10.1002/celc.202300387
Scopus
Zitationen: 3
Web of Science
Zitationen: 1
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 2196-0216
KITopen-ID: 1000164791
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in ChemElectroChem
Verlag John Wiley and Sons
Band 10
Heft 24
Seiten Art.-Nr.: e202300387
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 15.11.2023
Schlagwörter carbonation reaction, cyclic voltammetry, dynamic kinetic modelling, electrochemical CO2 reduction, silver
Nachgewiesen in Web of Science
Dimensions
Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 13 – Maßnahmen zum Klimaschutz
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page