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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.7K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.7K

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Updated: Jun 29, 2025

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Ligand-modified nanoparticle surfaces influence CO electroreduction selectivity.

Erfan Shirzadi1, Qiu Jin2, Ali Shayesteh Zeraati3

  • 1Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada.

Nature Communications
|April 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a thiol-modified surface ligand strategy to enhance electrochemical carbon monoxide (CO) to acetate conversion. This method improves selectivity and kinetics for producing valuable multi-carbon products from CO electroreduction.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Catalysis

Background:

  • Electrochemical reduction of carbon dioxide (CO2) and carbon monoxide (CO) to multi-carbon products is crucial for sustainable chemistry.
  • Improving the kinetics and selectivity of these reactions remains a significant scientific challenge.
  • Copper (Cu) based catalysts are promising for CO electroreduction but require optimization for specific product pathways.

Purpose of the Study:

  • To develop a novel surface ligand strategy for enhancing the electrochemical conversion of CO to acetate.
  • To elucidate the mechanism by which surface ligands influence the CO electroreduction pathway.
  • To achieve high selectivity and efficiency in CO-to-acetate electroreduction using modified copper catalysts.

Main Methods:

  • Synthesis and characterization of thiol-modified copper (Cu) catalysts.
  • Electrochemical experiments including cyclic voltammetry and chronoamperometry to assess catalytic performance.
  • In-situ Raman spectroscopy to probe surface species and reaction intermediates.
  • Density Functional Theory (DFT) calculations to investigate reaction mechanisms and energetics.

Main Results:

  • A thiol-modified surface ligand strategy was successfully developed, promoting selective electrochemical CO-to-acetate conversion.
  • Nucleophilic interaction between sulfur lone pairs and reaction intermediates was identified as a key factor in enhancing the acetate pathway.
  • Optimized thiol-capped Cu catalysts achieved a 70% Faradaic efficiency for acetate production with 100 mV lower onset potentials compared to reference catalysts.
  • In-situ Raman spectroscopy confirmed surface ligand-intermediate interactions, showing characteristic vibrational frequency shifts.

Conclusions:

  • Thiol-modified surface ligands effectively enhance the kinetics and selectivity of CO electroreduction to acetate.
  • The proposed mechanism involving nucleophilic sulfur interaction and stabilization of key intermediates explains the improved performance.
  • This strategy offers a promising route for developing efficient electrocatalysts for valuable multi-carbon chemical production.