期刊
CATALYSTS
卷 11, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/catal11060754
关键词
covalent organic framework; covalent triazine framework; photocatalysis; hydrogen evolution; metal nanoparticle; co-catalyst; Pt-doped COF; bandgap; charge separation; apparent quantum efficiency
资金
- Spanish Ministry of Science, Innovation and Universities [PID2019-104171RB-I00]
- Ramon y Cajal Program [RYC2018-025394-I]
- Royal Society of Chemistry [R20-8077]
Covalent organic frameworks (COFs) are crystalline porous organic polymers with tunable properties like bandgap and porosity. Recent studies have shown promising applications of COFs as photoactive platforms for the hydrogen evolution reaction (HER), but improvements in dispersibility in water and photocatalytic efficiency are needed.
Covalent organic frameworks (COFs) are crystalline porous organic polymers built from covalent organic blocks that can be photochemically active when incorporating organic semiconducting units, such as triazine rings or diacetylene bridges. The bandgap, charge separation capacity, porosity, wettability, and chemical stability of COFs can be tuned by properly choosing their constitutive building blocks, by extension of conjugation, by adjustment of the size and crystallinity of the pores, and by synthetic post-functionalization. This review focuses on the recent uses of COFs as photoactive platforms for the hydrogen evolution reaction (HER), in which usually metal nanoparticles (NPs) or metallic compounds (generally Pt-based) act as co-catalysts. The most promising COF-based photocatalytic HER systems will be discussed, and special emphasis will be placed on rationalizing their structure and light-harvesting properties in relation to their catalytic activity and stability under turnover conditions. Finally, the aspects that need to be improved in the coming years will be discussed, such as the degree of dispersibility in water, the global photocatalytic efficiency, and the robustness and stability of the hybrid systems, putting emphasis on both the COF and the metal co-catalyst.
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