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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic reduction of carbon dioxide (CO2) is crucial for sustainable chemical and fuel production.
  • Developing efficient and stable electrocatalysts for CO2 reduction reaction (CO2RR) remains a significant challenge.

Purpose of the Study:

  • To develop a simple, surfactant- and solvent-free method for fabricating Cu-Ag bimetallic gas diffusion electrodes (GDEs).
  • To investigate the enhanced CO2RR performance and stability of Cu-Ag GDEs compared to monometallic Cu.
  • To elucidate the role of Ag in improving C2 product selectivity and catalyst stability.

Main Methods:

  • Fabrication of Cu-Ag bimetallic GDEs using sputtering of Cu followed by galvanic replacement with Ag.
  • Electrochemical evaluation of CO2RR performance, including Faradaic efficiency (FE) and current density.
  • In situ X-ray absorption spectroscopy (XAS) to study the electronic structure and active species under reaction conditions.

Main Results:

  • Optimized Cu-Ag GDEs achieved high FE for C2 products (ethanol and ethylene), reaching 73% and 69% at 400 and 600 mA cm-2, respectively.
  • The Cu-Ag system demonstrated significantly improved operational stability, maintaining 49% FE for C2 products after 3 hours.
  • In situ XAS revealed that Ag stabilizes Cu+ species, promoting C-C coupling and enhancing long-term selectivity.

Conclusions:

  • The surfactant- and solvent-free fabrication of Cu-Ag GDEs offers a facile route to high-performance electrocatalysts.
  • The synergistic effect between Cu and Ag is key to enhancing CO2RR selectivity towards C2 products and improving catalyst stability.
  • This study provides valuable insights for designing advanced Cu-based catalysts for efficient CO2 conversion.