Interrupted Zeolitic Boron Imidazolate Framework with Open Metal Sites for Photocatalytic CO₂ Reduction

Area of Science:

• Materials Science
• Catalysis
• Green Chemistry

Background:

• Carbon dioxide (CO2) reduction is crucial for addressing the energy crisis.
• Designing efficient catalysts with enhanced activity and selectivity is key.
• Zeolitic boron imidazolate frameworks (BIFs) offer tunable structures for catalytic applications.

Purpose of the Study:

• To construct and investigate interrupted BIFs with unsaturated metal centers for photocatalytic CO2 reduction.
• To enhance catalytic performance through rational design of the framework and active sites.
• To evaluate the stability, porosity, and CO2 reduction efficiency of the developed catalyst.

Main Methods:

• Synthesis of interrupted zeolitic boron imidazolate frameworks (BIFs) with unsaturated cobalt (Co) sites.
• Modification of BIFs with terminal formate ligands (BIF-92-Co(FA)).
• Gas adsorption measurements to assess porosity and stability.
• Photocatalytic CO2 reduction experiments to determine product yield and selectivity.

Main Results:

• BIF-92-Co(FA) demonstrated excellent stability and high porosity.
• The catalyst achieved a high CO production rate of 3866.5 μmol g-1 h-1.
• High selectivity of 87.8% for carbon monoxide (CO) was observed in the photocatalytic CO2 reduction.

Conclusions:

• Interrupted BIFs with unsaturated metal sites are effective catalysts for CO2 reduction.
• The rational design of catalytic centers significantly enhances reaction performance.
• This study provides a pathway for developing advanced catalysts for sustainable chemical production.