Jump to main content
Jump to site search


Modeling gas-diffusion electrodes for CO2 reduction

Author affiliations

Abstract

CO2 reduction conducted in electrochemical cells with planar electrodes immersed in an aqueous electrolyte is severely limited by mass transport across the hydrodynamic boundary layer. This limitation can be minimized by use of vapor-fed, gas-diffusion electrodes (GDEs), enabling current densities that are almost two orders of magnitude greater at the same applied cathode overpotential than what is achievable with planar electrodes in an aqueous electrolyte. The addition of porous cathode layers, however, introduces a number of parameters that need to be tuned in order to optimize the performance of the GDE cell. In this work, we develop a multiphysics model for gas diffusion electrodes for CO2 reduction and used it to investigate the interplay between species transport and electrochemical reaction kinetics. The model demonstrates how the local environment near the catalyst layer, which is a function of the operating conditions, affects cell performance. We also examine the effects of catalyst layer hydrophobicity, loading, porosity, and electrolyte flowrate to help guide experimental design of vapor-fed CO2 reduction cells.

Graphical abstract: Modeling gas-diffusion electrodes for CO2 reduction

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Feb 2018, accepted on 04 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP01319E
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
  •   Request permissions

    Modeling gas-diffusion electrodes for CO2 reduction

    L. Weng, A. T. Bell and A. Z. Weber, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP01319E

Search articles by author

Spotlight

Advertisements