Light-Driven Hydrogen Evolution Assisted by Covalent Organic Frameworks

Catalysts

Jordi García-Antón¹  Laia Francàs¹  Xavier Sala¹  Nuria Romero¹  Roger Bofill¹ 

[1] Department of Chemistry, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;

关键词: covalent organic framework;    covalent triazine framework;    photocatalysis;    hydrogen evolution;    metal nanoparticle;    co-catalyst;   

DOI  :  10.3390/catal11060754

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown