CO electroreduction on single-atom copper

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Carbon dioxide (CO2) and carbon monoxide (CO) electroreduction to C2+ hydrocarbons is crucial for carbon-negative electrosynthesis.
• Understanding carbon-carbon (C-C) coupling mechanisms is vital for efficient electrocatalyst design.

Purpose of the Study:

• To investigate the CO electroreduction mechanism on single-atom copper (Cu) electrocatalysts.
• To elucidate the C-C coupling pathways and identify key intermediates.

Main Methods:

• Electrocatalytic studies using atomically dispersed Cu on a carbon nitride substrate.
• Chemisorption and computational studies.
• Analysis of reaction intermediates and product selectivity.

Main Results:

• Single-atom Cu sites coordinated with nitrogen moieties were synthesized.
• An Eley-Rideal type C-C coupling mechanism was observed, differing from the Langmuir-Hinshelwood mechanism on Cu metal.
• Isolated Cu sites selectively stabilized key intermediates, influencing product distribution.

Conclusions:

• Single-atom copper catalysts facilitate a distinct C-C coupling mechanism for CO electroreduction.
• This mechanism enhances selectivity and efficiency in producing C2+ hydrocarbons.
• The findings provide insights for designing advanced electrocatalysts for sustainable chemical synthesis.