LAUSR

Poly heptazine imide (PHI), one of the attractive allotropes of polymeric carbon nitride, has recently received extensive attention in photocatalysis due to its extended conjugation for fast separation and transfer of the charges. However, pristine PHI bears an intrinsic optical absorption band edge at 460 nm, which largely restrains the visible light utilization. Herein, the narrow-bandgap PHI (N-PHI) with an ordered-distorted interface has been fabricated from polycondensation of the mixture of NaSCN, cyanuric chloride and LiCl. Results reveal that the enhanced optical absorption and the promoted separation and transfer of the charge carriers at the interface greatly improve the photocatalytic performance, which endows N-PHI with an apparent quantum yield (AQY=20%) for hydrogen production at 450 nm.