Switching the photocatalytic activity of g-C₃N₄ by homogenous surface chemical modification with nitrogen residues and vacancies

A facile two-step homogenous approach is established to produce and control the nitrogen vacancies on g-C₃N₄ photocatalysts. The g-C₃N₄ undergoes a solvothermal N₂H₄·H₂O reduction inactivation and subsequent thermal reduction process to reactivate and achieve an enhanced photocatalytic activity toward hydrogen evolution.