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Summary

This study scaled up gas-phase carbon dioxide (CO2) electroreduction to formate using a 100 cm2 electrolyzer with a serpentine flow field. The optimized design achieved high formate concentration and production rates, demonstrating technical feasibility for industrial applications.

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CO2 electroreductionformateprototype designsscaling upzero‐gap gas diffusion electrodes

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Sustainable Energy

Background:

  • Scaling up gas-phase CO2 electroreduction to formate is critical for industrial viability but lacks extensive research.
  • Optimized flow field design is essential for efficient CO2 distribution and mass transfer in electrolyzers.

Purpose of the Study:

  • To design and validate a 100 cm2 gas-phase CO2 electroreduction electrolyzer prototype.
  • To investigate the impact of flow field geometry and operating parameters on CO2-to-formate conversion.
  • To assess the technical feasibility of scaling up CO2 electrolysis for formate production.

Main Methods:

  • Developed a 100 cm2 electrolyzer prototype with a zero-gap configuration and serpentine flow field for uniform CO2 distribution.
  • Conducted experimental tests varying current density and water content in the CO2 feed.
  • Compared performance with a 10 cm2 lab-scale reactor to evaluate scale-up benefits.

Main Results:

  • Optimal performance achieved at 200 mA cm-2 current density and 15 g h-1 water content.
  • Yielded a formate concentration of 760 g L-1, 67% Faradaic efficiency, and a production rate of 7 mmol m-2 s-1.
  • Demonstrated improved CO2 conversion and production rate compared to lab-scale, validating the scale-up approach, despite slightly reduced energy efficiency.

Conclusions:

  • The 100 cm2 electrolyzer prototype with a serpentine flow field proves the technical feasibility of scaling gas-phase CO2-to-formate electrolysis.
  • Optimized flow field design significantly enhances CO2 transport and minimizes mass transfer limitations.
  • Further advancements in electrolyzer design and energy management are necessary for industrial implementation.