Analytical modelling of CO2 reduction in gas-diffusion electrode catalyst layers

J. W. Blake*, J. T. Padding, J. W. Haverkort

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
71 Downloads (Pure)

Abstract

The electrochemical reduction of CO2 on planar electrodes is limited by its prohibitively low diffusivity and solubility in water. Gas-diffusion electrodes (GDEs) can be used to reduce these limitations, and facilitate current densities orders of magnitude higher than the limiting current densities of planar electrodes. These improvements are accompanied by increased variation in the local environment within the cathode, with significant effect on Faradaic efficiency. By developing a simple and freely available analytical model of a cathodic catalyst layer configured for the production of CO, we investigate the relationships between electrode reaction kinetics, cell operation conditions, catholyte composition and cell performance. Analytical methods allow us to cover parameter ranges that are intractable for numerical and experimental studies. We validate our findings against experimental and numerical results and provide a derivation and implementation of the analytical model.

Original languageEnglish
Article number138987
Number of pages8
JournalElectrochimica Acta
Volume393
DOIs
Publication statusPublished - 2021

Keywords

  • CO reduction
  • Electrolysis
  • Local pH

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