Copper-based homometallic and heterometallic binuclear complexes for electrocatalytic CO₂ reduction

Area of Science:

• Electrochemistry
• Catalysis
• Inorganic Chemistry

Background:

• Electrochemical reduction of carbon dioxide (CO2) is a key technology for sustainable energy.
• Developing efficient homogeneous catalysts is crucial for CO2 conversion.
• Tuning catalyst electronic structures can optimize reaction pathways.

Purpose of the Study:

• To synthesize and evaluate copper-based binuclear complexes as homogeneous catalysts for CO2 electroreduction.
• To investigate the effect of introducing a second metal site on catalytic performance.
• To understand how electronic structure modifications influence CO2 reduction selectivity.

Main Methods:

• Synthesis of copper-based binuclear complexes.
• Electrochemical characterization of catalytic activity.
• Analysis of product selectivity using techniques like gas chromatography and NMR spectroscopy.
• Computational studies to correlate electronic structure with performance.

Main Results:

• A series of copper-based binuclear complexes were successfully synthesized.
• The Cu-Cu complex demonstrated high selectivity for formic acid production with a faradaic efficiency (FE) of 71%.
• The Cu-Co complex showed activity towards hydrocarbon production with an FE of 17%, indicating tunable selectivity.

Conclusions:

• Binuclear copper complexes are effective homogeneous catalysts for CO2 electroreduction.
• Systematic tuning of electronic structures by introducing a second metal site effectively regulates catalytic performance and selectivity.
• These findings offer a pathway for designing advanced catalysts for selective CO2 conversion into valuable products.