Nanostructurally Engineering Covalent Organic Frameworks for Boosting CO₂ Photoreduction

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Covalent organic frameworks (COFs) offer tunable properties for various applications.
• Developing efficient photocatalysts for CO2 reduction is crucial for sustainable energy.

Purpose of the Study:

• To synthesize novel ordered mesoporous hollow spherical COFs (OMHS-COFs).
• To investigate their application as photocatalysts for CO2-to-CO reduction.

Main Methods:

• One-step self-templated synthesis strategy.
• Characterization of nanomorphology and pore structure.
• Photocatalytic CO2 reduction experiments.
• In/ex situ analysis and DFT calculations.

Main Results:

• Successfully synthesized OMHS-COFs with ultra-large mesopores (4.6 nm).
• OMHS-COF-Co achieved a CO production rate of 15,874 µmol g⁻¹ h⁻¹ with 92.4% selectivity.
• Demonstrated excellent cycling stability.

Conclusions:

• The unique ordered mesoporous hollow spherical structure and isolated Co active sites in OMHS-COF-Co enhance CO2 activation and electron transfer.
• These findings highlight the potential of OMHS-COFs for efficient CO2 photoreduction.