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Silver-enhanced copper catalysts improve electrochemical conversion of carbon monoxide (CO) to alcohols, including n-propanol. Pulsed electrolysis and catalyst design enable high selectivity and efficiency for sustainable chemical production.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Electrochemical reduction of carbon monoxide (CO) is a key pathway for producing valuable alcohols.
  • Developing efficient and selective catalysts is crucial for advancing CO conversion technologies.

Purpose of the Study:

  • To enhance the selectivity and efficiency of CO electroreduction to alcohols, particularly n-propanol.
  • To investigate the role of silver incorporation and pulsed electrolysis in catalyst performance.

Main Methods:

  • Incorporation of silver (Ag) onto oxide-derived copper catalysts.
  • Pulsed-mode electrolysis for CO reduction.
  • Integration of the catalyst into a continuous-flow electrolyzer.

Main Results:

  • Achieved 75.7% selectivity for alcohols, with 48.8% towards n-propanol, using Ag-enhanced copper under pulsed electrolysis.
  • Demonstrated a Faradaic efficiency of 66.7% for multicarbon alcohols (40.4% n-propanol) over 116 hours in a flow electrolyzer.
  • Identified tunable hydroxide surface adsorption and optimized hydrogen binding as key factors for selectivity enhancement.

Conclusions:

  • Silver incorporation and pulsed electrolysis synergistically enhance CO electroreduction selectivity.
  • The developed catalyst system shows promise for efficient and stable production of n-propanol and other alcohols.
  • This work advances electrochemical conversion technologies for sustainable alcohol synthesis.