CO₂ Electrolysis via Surface-Engineering Electrografted Pyridines on Silver Catalysts

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2) is crucial for producing value-added chemicals.
• Transition-metal and molecular catalysts on solid supports are promising for CO2 electroreduction.

Purpose of the Study:

• To develop a combined silver (Ag) and pyridine catalyst for enhanced CO2 electroreduction.
• To investigate the cocatalytic effect of integrating Ag and pyridine structures.

Main Methods:

• One-pot and irreversible electrografting of Ag and pyridine on a conductive support.
• Electrochemical characterization to assess CO2 reduction performance.
• Tuning pyridine carbon chain length to optimize catalytic activity.

Main Results:

• Tailoring pyridine chain length shifted the onset potential by 200 mV compared to bare Ag.
• Achieved a 10-fold activity enhancement at -0.7 V vs RHE with higher partial current densities for CO.
• Demonstrated a cocatalytic effect through the integration of Ag and pyridine structures.

Conclusions:

• The combined Ag-pyridine catalyst exhibits enhanced CO2 electroreduction performance.
• The integration of different catalytic structures leads to a significant cocatalytic effect.
• The approach shows potential for adaptation with various transition metals and molecular cocatalysts in flow cells.