Microporous Covalent Organic Frameworks

Strong pore confinement

A two-dimensional covalent organic framework as sulfur host that addresses polysulfide shuttling and sluggish kinetics via confined microporous channels and accessible catalytic nitrogen sites.

Ruilin, Mai · Gao, Xiangwen · Liang, Zheng · Fu, Chaopeng

Advanced Materials 2026

Specifications

Reversible capacity

{'zh': '1120', 'en': '1120'} mAh g⁻¹

Capacity retention

{'zh': '93.5', 'en': '93.5'} %

Advantages

Smaller pores confine better

Smaller micropores exert stronger capillary forces on polysulfides, restricting their dissolution and shuttle, thus improving Coulombic efficiency and cycling stability.

Catalytic sites speed conversion

Accessible catalytic nitrogen sites promote the multistep conversion kinetics of the sulfur cathode during cycling, reducing polarization and improving capacity utilization.

Applications

• Al-S battery cathodes：Using COF as sulfur host to suppress shuttle and accelerate conversion for better cycling.
• COF synthesis：Tuning micropore size via ligand length to synthesize COFs with controlled pores.
• Sulfur hosts for energy storage：Offering confined micropores and catalytic sites to host sulfur for energy storage.
• Polysulfide confinement：Using capillary forces in small pores to confine polysulfides and reduce shuttle.