New two dimensional porous graphitic carbon nitride nanosheets for highly efficient photocatalytic hydrogen evolution under visible light irradiation
Aiming at tedious preparation procedures for 2D porous graphitic carbon nitride (2DPCN) nanosheets, a one step thermal polymerization method based on a supramolecular precursor has been developed. As prepared 2DPCNs exhibit enlarged specific surface areas with rich reaction sites, better crystallinity, stronger visible light harvesting capability, aligned energy levels and faster charge transfer. A superior photocatalytic hydrogen evolution rate of 220 mmol h 1 under visible light (l 420 nm) irradiation, has been achieved. In the meantime, an apparent quantum yield of 1.3% at 490 nm is also obtained, indicating that 2DPCN possesses green light activity. Our one step thermal polymerization method based on a supramolecular precursor provides a new way to develop C3N4 photocatalysts with different morphologies and better photoelectric properties.