Light‐driven hydrogen evolution assisted by covalent organic frameworks

Nuria Romero, Roger Bofill*, Laia Francàs, Jordi García‐antón, Xavier Sala

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number754
Number of pages17
JournalCatalysts
Volume11
Issue number6
DOIs
Publication statusPublished - 21 Jun 2021

Keywords

  • Apparent quantum efficiency
  • Bandgap
  • Charge separation
  • Covalent organic framework
  • Covalent triazine framework
  • Co‐catalyst
  • Hydrogen evolution
  • Metal nanoparticle
  • Photocatalysis
  • Pt‐doped COF

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