Abstract
Covalent organic frameworks (COFs) have become effective platforms for solar energy conversion and utilization. The rational design of the COF topology provides an effective strategy to expand the π-conjugation system and improve the photocatalytic activity. Herein, we have prepared two sub-stoichiometric pyrene-based 2D-COFs with the bex topology, HITMS-COF-10 and HITMS-COF-11, with high crystallinity and specific surface area. The HITMS-COF-11 exhibits an outstanding photocatalytic hydrogen evolution reaction (HER) rate of 25000 μmol g−1 h−1 in water under visible illumination (λ > 420 nm), demonstrating that the bex topological COFs could be one of the state-of-the-art photocatalyst candidates for hydrogen evolution and the importance of tuning the topological diversity at molecular levels for solar energy conversion and utilization.
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