Electrocatalytic CO₂ Reduction and H₂ Evolution by a Copper (II) Complex with Redox-Active Ligand

Area of Science:

• Catalysis
• Renewable Energy
• Green Chemistry

Background:

• Electrocatalytic CO2 reduction and H2 evolution are key for renewable energy and environmental remediation.
• Ligand design significantly influences catalytic activity and efficiency.

Purpose of the Study:

• To develop and investigate a novel copper (II) complex for efficient electrocatalytic CO2 reduction and H2 evolution.
• To elucidate the role of redox-active ligands in enhancing catalytic performance.

Main Methods:

• Synthesis and X-ray crystallography of the copper (II) complex [Cu(L)2NO3]NO3.
• Electrocatalytic performance evaluation for CO2 reduction and H2 evolution.
• Density Functional Theory (DFT) calculations to understand the catalytic mechanism.

Main Results:

• The copper (II) complex exhibits homogeneous catalysis for CO2 to CO conversion and H2 evolution.
• A labile nitrate ligand provides an open coordination site, facilitating substrate binding.
• Cooperative effects between the Cu(II) ion and the redox-active ligand enhance catalytic activity.
• Proton sources (H2O and TsOH·H2O) significantly boost electrocatalytic efficiency for CO2 reduction and H2 evolution, respectively.

Conclusions:

• The developed copper (II) complex with a redox-active ligand is a highly effective catalyst for CO2 reduction and H2 evolution.
• The ligand's redox activity and the labile nitrate ligand play crucial roles in the catalytic process.
• This study provides insights into designing efficient electrocatalysts for sustainable energy applications.