Fig. 1: Natural and artificial photosynthesis.
From: Covalent organic framework photocatalysts for green and efficient photochemical transformations

a Plants convert H2O and CO2 into O2 and carbohydrates via natural photosynthesis. Inset: Capillary effect for water transport. b Hexavalent COFs with precisely tuned skeletons and trigonal supermicropores for artificial photosynthesis. c Schematic of hexavalent supermicroporous COFs for artificial photosynthesis through water oxidation at knot and oxygen reduction at linker. d Schematics of charge transport/accumulation in π columns and water/oxygen delivery through 1D channels, enabling photosynthesis of H2O2 with water and oxygen.