Integrating configuration, doping and heterojunction into the g-C3N4-based photocatalyst for water splitting

Construction of a highly efficient g-C3N4-based photocatalyst for hydrogen generation is promising but still challenging. In this work, the 1T-phase MoS2 nanosheets are prepared by using supercritical carbon dioxide, which are utilized to build 2D-2D g-C3N4/MoS2 heterojunction for solar H2 generation. In addition, MoS2 is also severed as the precursor of heteroatom to dope into 2D g-C3N4 nanosheets for forming monatomic Mo-doped g-C3N4-based photocatalyst. The obtained single atomic Mo-doped 2D/2D g-C3N4/MoS2 heterojunction exhibits a boosted H2 production of 2222.6 mu mol g-1 h-1 with the apparent quantum yield of 9.08%, far exceeding the primitive one. Theoretical calculations and experimental results demonstrate that Mo-PCN/PMS composite possess a Mo-N3 configuration, and the synergy of three promoted strategies, including stripping, doping, and heterojunction plays vital roles in boosting the catalytic activity. This study implies that the integrated g-C3N4- based composite has great potential application in the field of photocatalytic hydrogen evolution.