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Constructing Ag/Cu2O Interface for Efficient Neutral CO2 Electroreduction to C2H4.

Zongnan Wei1,2, Wenwen Wang2, Tao Shao2

  • 1Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.

Angewandte Chemie (International Ed. in English)
|October 29, 2024
PubMed
Summary

This study developed an optimized silver-copper oxide (Ag-Cu2O) catalyst for neutral carbon dioxide (CO2) electroreduction. The catalyst achieves high selectivity for ethylene (C2H4) production at industrial current densities, offering a promising route for CO2 utilization.

Keywords:
*CO coverageC2H4 productionElectrochemical CO2 reductionInterfacial catalystNeutral electrolyte

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Neutral CO2 electroreduction to multi-carbons (C2+) is a key strategy for CO2 mitigation and energy conversion.
  • Achieving high selectivity for specific products like ethylene (C2H4) at industrial current densities remains a significant challenge due to sluggish C-C coupling kinetics.

Purpose of the Study:

  • To develop an optimized interfacial catalyst for efficient and selective neutral CO2 electroreduction.
  • To investigate the role of bimetallic interfaces in enhancing C-C coupling and product selectivity.

Main Methods:

  • Fabrication and optimization of a silver-copper oxide (Ag-Cu2O) interfacial catalyst.
  • Electrochemical performance evaluation in a flow cell at industrial-relevant current densities.
  • In situ Raman spectroscopy and theoretical calculations to elucidate reaction mechanisms.

Main Results:

  • The optimized Ag-Cu2O catalyst achieved a C2+ Faradaic efficiency (FE) of 73.6% at 650 mA cm-2.
  • Remarkably high FE for ethylene (FE_C2H4) of 66.0% was obtained at a partial current density of 429.1 mA cm-2.
  • In situ Raman and theoretical calculations revealed enhanced CO formation and C-C coupling at the Ag/Cu2O interface.

Conclusions:

  • The Ag-Cu2O interfacial catalyst demonstrates unprecedented performance for neutral CO2 electroreduction to C2H4.
  • The bimetallic interface plays a crucial role in promoting CO adsorption and facilitating C-C coupling.
  • This work provides fundamental insights into designing advanced catalysts for efficient CO2 conversion.