Abstract
Covalent organic frameworks (COFs) have recently emerged as a new class of photocatalysts. However, integrated design is crucial to maximizing the performance of COF-incorporating photocatalytic systems. Herein, we compare two strategies of installing earth-abundant metal-based catalytic centers into the matrice of a 2D COF named NUS-55. Compared to NUS-55(Co) prepared from the post-synthetic metalation of coordination sites within the COF, the molecular co-catalyst impregnated NUS-55/[Co(bpy)3]Cl2 achieves a seven-fold improvement in visible light-driven H2 evolution rate to 2,480 µmol g−1 h−1, with an apparent quantum efficiency (AQE) of 1.55% at 450 nm. Our results show that the rational design of molecular anchoring sites in COFs for the introduction of catalytic metal sites can be a viable strategy for the development of highly efficient photocatalysts with enhanced stability and photocatalytic activities.
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Acknowledgements
This work was supported by the National Research Foundation of Singapore (NRF2018-NRF-ANR007 POCEMON), the Ministry of Education-Singapore (MOE AcRF Tier 1 R-279-000-540-114, Tier 2 MOE2018-T2-2-148), the Agency for Science, Technology and Research (IRG A1783c0015, IAF-PP A1789a0024), and the Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-Aged Teachers and Presidents.
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Wang, J., Zhang, J., Peh, S.B. et al. Cobalt-containing covalent organic frameworks for visible light-driven hydrogen evolution. Sci. China Chem. 63, 192–197 (2020). https://doi.org/10.1007/s11426-019-9658-1
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DOI: https://doi.org/10.1007/s11426-019-9658-1