Design and Architecture of P-O Co-Doped Porous g-C3N4 by Supramolecular Self-Assembly for Enhanced Hydrogen Evolution

A novel phosphorus and oxygen co-doped graphitic carbon nitride (sheetP-O-CNSSA) photocatalyst was successfully synthesized applied for H2 evolution under visible light. In the synthesis process of sheetP-O-CNSSA, supramolecular complex developed by self-assembly copolymerization reaction among melamine, cyanuric acid (CA) trithiocyanuric (TCA) to act as g-C3N4 precursors, while (NH4)2HPO4 P O precursors element doping. The chemical structures, morphologies, optical properties sheetP-O-CNSSA were characterized a series measurements, i.e., XRD, FT-IR, SEM, TEM, UV-vis DRS, PL. results suggested that introduction elements could enhance separation migration efficiency photogenerated electrons holes in energy band g-C3N4. photocatalytic tests over Erythrosin B (EB) sensitized indicated hydrogen greatly enhanced compared with other catalysts non-sensitized light irradiation. Finally, possible dye-sensitized photocatalysis mechanism also proposed on basis as-obtained results.