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Updated: Sep 20, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Molecular Inhibition for Selective CO2 Conversion.

Charles E Creissen1, José Guillermo Rivera de la Cruz1, Dilan Karapinar1

  • 1Laboratoire de Chimie des Processus Biologiques, CNRS UMR 8229, Collège de France, 75231, Paris, France.

Angewandte Chemie (International Ed. in English)
|June 9, 2022
PubMed
Summary

Researchers developed a new method to control the products of electrochemical carbon dioxide (CO2) reduction using surface-immobilised molecules. This approach enhances selectivity for desired chemicals and fuels, offering a sustainable pathway for CO2 conversion.

Keywords:
Carbon DioxideElectrocatalysisHeterogeneous CatalysisInhibitionMolecular Modification

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Electrochemical carbon dioxide (CO2) reduction is a promising sustainable method for producing valuable chemicals and fuels.
  • Achieving high selectivity in CO2 reduction using heterogeneous copper (Cu) catalysts is difficult due to limited control over product distribution.
  • Conventional modifications of catalyst materials provide insufficient control over reaction selectivity.

Purpose of the Study:

  • To demonstrate that surface-immobilised molecular species can act as inhibitors to control product selectivity in electrochemical CO2 reduction.
  • To provide a rational approach for modifying heterogeneous catalysts for enhanced selectivity.
  • To investigate the mechanism by which molecular inhibitors influence CO2 reduction pathways.

Main Methods:

  • Experimental investigation of surface-immobilised thiol-functionalised pyridine on copper (Cu) catalysts.
  • Computational analysis using density functional theory (DFT) to study reaction intermediates and pathways.
  • Characterisation of catalyst performance and product distribution under electrochemical conditions.

Main Results:

  • Surface-immobilised pyridine derivatives were shown to selectively inhibit specific carbon product formation.
  • Anchoring of a thiol-functionalised pyridine on Cu destabilised a key reaction intermediate, energetically blocking the carbon monoxide (CO) producing pathway.
  • This inhibition mechanism significantly favoured the production of formate over CO.
  • The nitrogen atom within the pyridine molecule was identified as essential for the observed inhibition effect.

Conclusions:

  • Surface-immobilised molecules can serve as effective inhibitors, offering rational control over product selectivity in heterogeneous catalysis.
  • This molecular inhibition strategy provides a novel approach to tailor catalyst performance for specific CO2 reduction products.
  • The findings open new avenues for designing advanced catalysts for sustainable chemical synthesis via CO2 electroreduction.