Quasi-Three-Dimensional Cyclotriphosphazene-Based Covalent Organic Framework Nanosheet for Efficient Oxygen Reduction.

Abstract in brief

• The study discusses the creation of unique quasi-three-dimensional cyclotriphosphazene-based covalent organic frameworks (Q3CTPCOFs) and their nanosheets, which serve as efficient, metal-free electrocatalysts for oxygen reduction reactions (ORR).
• The bilayer stacking structure of these frameworks enhances the exposure of active carbon sites and facilitates mass diffusion, resulting in high catalytic activity, with nanosheets showing a high half-wave potential of 0.72V vs RHE in alkaline solution.
• These nanosheets not only demonstrate excellent ORR performance but also show potential as cathodes in zinc-air batteries, achieving a power density of 156 mW/cm², highlighting their promise for clean energy applications.]