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Squeezing Gas Diffusion Electrodes in Zero-Gap CO2 Electrolyzers─Enough Is Enough.

Viktor Józó1, Soma B Halasi1, Dániel Sebők2,3

  • 1Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Square 1, H-6720 Szeged, Hungary.

ACS Applied Materials & Interfaces
|July 8, 2026
PubMed
Summary
This summary is machine-generated.

Optimizing cathode compression is key for industrial carbon dioxide electroreduction. Finding the right compression range ensures long-term performance and efficiency for this promising CO2 to CO technology.

Keywords:
CCUCO productionGDEcarbon dioxideelectrolyzer engineering

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Electrochemical reduction of carbon dioxide to carbon monoxide (CO2RR) is nearing industrial application.
  • Scaling up CO2RR technology requires understanding component behavior and challenges at larger sizes.

Purpose of the Study:

  • To investigate the impact of cathode gas diffusion electrode compression ratio on CO2RR performance.
  • To analyze how different carbon-based cathode supports respond to varying compression.

Main Methods:

  • Electrochemical impedance spectroscopy was used to analyze performance changes.
  • Microtomography measurements provided insights into structural alterations.
  • Cathodes were compressed to less than 40% of their original thickness.

Main Results:

  • Optimal compression range is dependent on the specific gas diffusion layer properties.
  • A broad optimal compression range (60-85% original thickness) was identified for the ELAT1400W gas diffusion layer.
  • Performance was confirmed over 100-hour experiments.

Conclusions:

  • Cathode compression is a critical parameter for optimizing CO2RR systems.
  • Tailoring compression to gas diffusion layer characteristics is essential for efficient and durable CO2 electrolysis.
  • The findings provide guidance for scaling up CO2RR technology.