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Decoupling Charge Carrier Electroreduction and Enzymatic CO2 Conversion to Formate Using a Dual-Cell Flow Reactor

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This study introduces an enzymatic catalyst for selective CO2 conversion to formate, achieving 25 mM production and over 50% Coulombic efficiency. The dual-cell system enhances stability and yield for sustainable fuel applications.

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Area of Science:

  • Electrochemistry
  • Biocatalysis
  • Sustainable Chemistry

Background:

  • Formic acid (FA) is a valuable fuel derived from CO2, crucial for fuel cells and hydrogen storage.
  • Traditional metal catalysts for CO2 conversion to FA face challenges with side reactions and long-term product recovery.
  • Enzymatic catalysis offers a promising alternative for selective and efficient CO2 conversion.

Purpose of the Study:

  • To develop and optimize an enzymatic catalytic system for the selective electrochemical conversion of carbon dioxide (CO2) to formate.
  • To enhance the stability and production yield of formate using a dual-cell flow reactor system.
  • To investigate the impact of system design configurations on long-term performance and efficiency.

Main Methods:

  • Utilized a dual-cell flow reactor system with electrochemical reduction of a charge mediator to activate an enzymatic catalyst.
  • Employed a pH control pump to maintain optimal catalyst activity and a packed bed reactor for improved charge carrier-catalyst contact.
  • Monitored formate production, Coulombic efficiency, and catalyst stability over extended operational periods (approximately 168 hours).

Main Results:

  • Achieved a formate production of 25 mM with over 50% Coulombic efficiency.
  • The dual-cell system demonstrated improved formate yield compared to batch systems and minimized enzyme degradation.
  • Optimized configurations with pH control and packed bed reactors maintained high production and efficiency over long-term operation.

Conclusions:

  • The enzymatic dual-cell system effectively converts CO2 to formate, showcasing potential for sustainable fuel production.
  • The study highlights the complex interplay of parameters in optimizing electrochemical CO2 conversion systems.
  • Further improvements to this configuration hold promise for various electrochemical CO2 utilization applications.