Defect-Engineered Cu-Based Nanomaterials for Efficient CO₂ Reduction over Ultrawide Potential Window

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient carbon dioxide (CO2) reduction electrocatalysis is crucial for sustainable energy solutions.
• Achieving high conversion efficiency while suppressing competing hydrogen evolution reactions (HER) remains a significant challenge.

Purpose of the Study:

• To develop a novel catalyst for efficient CO2 electroreduction.
• To investigate the synergistic effects of multidimensional defects on catalytic performance.

Main Methods:

• Fabrication of highly diluted SnCu polycrystal with integrated point defects (Sn doping) and planar defects (grain boundaries).
• Electrochemical testing over an ultrawide potential window (1.3 V).
• Theoretical studies using computational methods to understand reaction mechanisms.

Main Results:

• The engineered SnCu polycrystal exhibited high Faradaic efficiencies (>95%) for CO2 electroreduction.
• The catalyst demonstrated excellent performance over an ultrawide operating potential window.
• Theoretical analysis revealed that Sn doping and grain boundaries synergistically optimize electronic properties, suppressing H2 evolution and promoting CO2 hydrogenation.

Conclusions:

• Multidimensional defect engineering in Cu substrates is an effective strategy for enhancing CO2 electroreduction.
• The developed SnCu polycrystal catalyst shows significant promise for practical CO2 utilization and conversion applications.