Investigating electrode flooding in a flowing electrolyte, gas‐fed carbon dioxide electrolyzer

McLain E. Leonard, Lauren E. Clarke, Antoni Forner-Cuenca, Steven M. Brown, Fikile R. Brushett (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

26 Citaten (Scopus)
1 Downloads (Pure)

Samenvatting

Managing the gas–liquid interface within gas-diffusion electrodes (GDEs) is key to maintaining high product selectivities in carbon dioxide electroreduction. By screening silver-catalyzed GDEs over a range of applied current densities, an inverse correlation was observed between carbon monoxide selectivity and the electrochemical double-layer capacitance, a proxy for wetted electrode area. Plotting current-dependent performance as a function of cumulative charge led to data collapse onto a single sigmoidal curve indicating that the passage of faradaic current accelerates flooding. It was hypothesized that high cathode alkalinity, driven by both initial electrolyte conditions and cathode half-reactions, promotes carbonate formation and precipitation which, in turn, facilitates electrolyte permeation. This mechanism was reinforced by the observations that post-test GDEs retain less hydrophobicity than pristine materials and that water-rinsing and drying electrodes temporarily recovers peak selectivity. This knowledge offers an opportunity to design electrodes with greater carbonation tolerance to improve device longevity.

Originele taal-2Engels
Pagina's (van-tot)400-411
Aantal pagina's12
TijdschriftChemSusChem
Volume13
Nummer van het tijdschrift2
Vroegere onlinedatum17 nov 2019
DOI's
StatusGepubliceerd - 19 jan 2020

Vingerafdruk Duik in de onderzoeksthema's van 'Investigating electrode flooding in a flowing electrolyte, gas‐fed carbon dioxide electrolyzer'. Samen vormen ze een unieke vingerafdruk.

Citeer dit