In this study, we prepared carbon self-doped carbon nitride nanosheets through a glucose synergic co-condensation method. In the carbon self-doped structure, the N atoms in the triazine rings were substituted by C atoms, resulting in enhanced visible-light photocatalytic hydrogen production, which is three-times higher than that of bulk carbon nitride. The enhanced photocatalytic hydrogen production was attributed to the higher charge-carrier transfer rate and widened light absorption range of the carbon nitride nanosheets after carbon self-doping. Thus, this work highlights the importance of carbon self-doping for improving the photocatalytic performance. Meanwhile, it provides a feasible method for the preparation of carbon self-doped carbon nitride without destroying the 2D conjugated backbone structures.Keywords:carbon nitride nanosheets;carbon self-doping;photocatalytic hydrogen production;charge transfer rate
Graphical Carbon self-doped g-C 3 N 4 nanosheets were synthesized in a simple way by a one-step calcination of a ternary supramolecular network of cyanuric acid, ethylene glycol (EG), and melamine. Carbon doping resulted in a distorted framework and induced the activation of n–π* electronic transitions of the C-g-C 3 N 4 nanosheets. The obtained C-g-C 3 N 4 displayed high activity for photocatalytic H 2 evolution owing to the extended light harvesting and faster separation of photogenerated electrons and holes. This paper reports a facile one-pot synthesis strategy to prepare carbon self-doped g-C 3 N 4 (C-g-C 3 N 4 ) nanosheets by using supramolecular networks consisting of cyanuric acid, ethylene glycol (EG), and melamine (CEM) bonded through hydrogen bonding as the thermal polycondensation precursor, in which EG serves as a solvent for cyanuric acid and melamine, and as a source of the doped carbon simultaneously. The threedimensional structure of CEM resulted in the distortion of C-g-C 3 N 4 , which is capable of motivating the n–π* electronic transition involving the N lone pairs to give an additional absorption region from 450 to 600 nm. The hydrogen evolution rate of C-g-C 3 N 4 reaches 73.09 μmol h −1 , which is about 15 times of that over the g-C 3 N 4 obtained from direct thermal polycondensation of melamine owing to its extended light harvesting and faster separation of photogenerated electrons and holes.
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