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Bifunctional Ionic Deep Eutectic Electrolytes for CO2 Electroreduction.

Ahmed Halilu1,2, Mohamed Kamel Hadj-Kali3, Mohd Ali Hashim1,2

  • 1Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur50603, Malaysia.

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Summary
This summary is machine-generated.

A novel ionic deep eutectic electrolyte (DEACl-DEA) enables efficient electroreduction of carbon dioxide (CO2) to CO2•− with 94% faradaic efficiency. This bifunctional electrolyte demonstrates high CO2 capture capacity and promotes sustainable CO2 electroreduction.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Green Chemistry

Background:

  • Carbon dioxide (CO2) is a low-cost monomer for carboxylation reactions.
  • Sustainable activation of CO2 via electroreduction (ECO2R) requires stable electrolyte media.
  • Ionic deep eutectic electrolytes offer potential for enhanced electrochemical processes.

Purpose of the Study:

  • To synthesize and characterize a novel diethyl ammonium chloride-diethanolamine (DEACl-DEA) ionic deep eutectic electrolyte.
  • To evaluate the performance of DEACl-DEA in the electroreduction of CO2.
  • To investigate the mechanism promoting ECO2R using bifunctional CO2 sorption.

Main Methods:

  • Synthesis and characterization of DEACl-DEA electrolyte.
  • Electrochemical evaluation of CO2 electroreduction using cyclic voltammetry and chronoamperometry.
  • Analysis of CO2 capture capacity and electrolyte stability.
  • Electrochemical impedance spectroscopy (EIS) and COSMO-RS modeling.

Main Results:

  • DEACl-DEA exhibits a deep eutectic point of -69.78 °C and a cathodic stability limit of -1.7 V vs. Ag/AgCl.
  • The DEACl-DEA (1:3) electrolyte achieved 94% faradaic efficiency for CO2 electroreduction to CO2•− at -1.5 V vs. Ag/AgCl.
  • The electrolyte demonstrated a high ambient CO2 capture capacity of 52.71 mol/L.
  • EIS and COSMO-RS analyses confirmed bifunctional CO2 sorption enhances ECO2R, evidenced by reduced electrochemical double layer capacitance (EDCL) due to CO2-electrolyte interactions.

Conclusions:

  • The synthesized DEACl-DEA (1:3) electrolyte effectively promotes sustainable CO2 electroreduction.
  • Bifunctional CO2 sorption and a high cathodic limit are crucial for efficient ECO2R electrolytes.
  • This study establishes a new criterion for designing electrolytes for CO2 electroreduction.