Self‐Assembly Synthesis of Oxygen and Sulfur Co‐Doped Porous Graphitic Carbon Nitride Nanosheets for Boosting CO₂ Photoreduction

Abstract

Graphitic carbon nitride (CN) has garnered considerable attention in the field of visible‐light CO2 photoreduction, but its efficiency remains limited by the intrinsic π‐conjugated skeleton. Here, O and S were co‐doped CN (O, S/CN) by a facile “hydrolysis + calcination” approach to modulate the physicochemical and electronic structure. Distinctive from S doped CN (SCN), O, S/CN owned porous layer structure with several nanosheets and less SO42‐ groups on the surface. The amount of heteroatom‐doping was achieved by changing the hydrothermal temperature. The optimum O, S/CN‐80 achieved moderate CO production rate of 1.29 μmol g‐1h‐1, which was 3.79 times as much as SCN (0.34 μmol g‐1h‐1). The O and most S atoms were substitutionally doped and the effect of S doped state on the improved efficiency of CO generation in O, S/CN was also explored based on the theoretical calculations. This work provides an inspiration to develop efficient dual‐doped CN photocatalysts for photocatalytic CO2 reduction.