Cobalt-containing covalent organic frameworks for visible light-driven hydrogen evolution

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 192-197
• 页数: 6页
• 语种: 英文

摘要

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 ofa 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]C12 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.