Geometric Catalyst Utilization in Zero-Gap CO2 Electrolyzers

Siddhartha Subramanian; Kailun Yang; Mengran Li; Mark Sassenburg; Maryam Abdinejad; Erdem Irtem; Joost Middelkoop; Thomas Burdyny

doi:10.1021/acsenergylett.2c02194

Geometric Catalyst Utilization in Zero-Gap CO₂ Electrolyzers

ACS Energy Lett. 2022 Nov 28;8(1):222-229. doi: 10.1021/acsenergylett.2c02194. eCollection 2023 Jan 13.

Authors

Siddhartha Subramanian¹, Kailun Yang¹, Mengran Li¹, Mark Sassenburg¹, Maryam Abdinejad¹, Erdem Irtem¹, Joost Middelkoop¹, Thomas Burdyny¹

Affiliation

¹ Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.

Abstract

The electrochemical reduction of CO₂ (CO₂RR) on silver catalysts has been demonstrated under elevated current density, longer reaction times, and intermittent operation. Maintaining performance requires that CO₂ can access the entire geometric catalyst area, thus maximizing catalyst utilization. Here we probe the time-dependent factors impacting geometric catalyst utilization for CO₂RR in a zero-gap membrane electrode assembly. We use three flow fields (serpentine, parallel, and interdigitated) as tools to disambiguate cell behavior. Cathode pressure drop is found to play the most critical role in maintaining catalyst utilization at all time scales by encouraging in-plane CO₂ transport throughout the gas-diffusion layer (GDL) and around salt and water blockages. The serpentine flow channel with the highest pressure drop is then the most failure-resistant, achieving a CO partial current density of 205 mA/cm² at 2.76 V. These findings are confirmed through selectivity measurements over time, double-layer capacitance measurements to estimate GDL flooding, and transport modeling of the spatial CO₂ concentration.