Donor-acceptor carbon nitride with electron-withdrawing chlorine group to promote exciton dissociation

Carbon nitride (C 3 N 4 ) is promising for photocatalytic hydrogen production, but photogenerated electrons and holes in C usually tend to exist as excitons due intrinsic Coulomb interactions making its activity unsatisfactory. Herein, a well-designed intramolecular -based donor-acceptor (D-A) system was constructed promote exciton dissociation. Due good chemical compatibility with melamine appropriate sublimation property, 2-amino-4,6-dichloropyrimidine unit chosen the monomer react construct D-A (CNCl x ). The evolution rate of CNCl 0.15 15.3 times higher than that bulk under visible light irradiation, apparent quantum efficiency 13.6% at 420 nm. enhanced attributed introduced electron-withdrawing ?Cl group terminal resulted samples, which can build internal electric field dissociation into free electron hole. In addition, lower work function value samples indicates help transfer surface reaction. Compared , carbon catalysts exhibit much performance by incorporating group, charge carrier transfer.