Facile synthesis of sulfur-doped polymeric carbon nitride/MoS2 face-to-face heterojunction for highly efficient photocatalytic interfacial charge separation

The notorious rapid recombination of photoinduced electron-hole limits the further application of polymeric carbon nitride (PCN) based photocatalysts. Face-to-face heterojunction composed of dissimilar 2D nanomaterials has been explored as a feasible way to facilitate the charge separation of PCN at the atomically well-defined hetero-interface. However, the conventional exfoliation-assembling process is tedious and time-consuming. Herein, a 2D/2D face-to-face heterojunction (MCN) has been constructed between sulfur (S)-doped polymeric carbon nitride nanosheets (SCN) and ultrathin molybdenum disulfide (MoS2) via a facile hydrothermal-polymerization method to overcome the recombination of photoinduced electron-hole pairs. The as-prepared MCN face-to-face heterojunction facilitated charge transport for the intimate interface contact and enhanced the separation of charge carriers, thus exhibiting high H2 evolution activity (2120 μmol h−1 g−1) without any other co-catalyst and high efficient degradation of dye. This work provides a facile protocol for synthesis of 2D/2D carbon nitride based photocatalysts towards future energy technology innovation.