Two-dimensional graphitic carbon nitride (2D CN) shows superior photocatalytic performance due to high charge separation efficiency and the rich active sites endowed with a 2D structure. However, the 2D structure also induces the weaknesses of easier agglomeration and wider bandgap which can weaken the H2 evolution capacity. Aiming to solve these defects, we prepared a brown mesoporous carbon nitride photocatalyst through phosphorus doping (BMCN). The phosphorus doping brings an excellent visible light response, a stable mesoporous structure with rich active sites, and a more negative CB potential. The optimized BMCN-50 shows a high H2 evolution rate of 2.7 mmol g−1 h−1 which is over 5 times than that of pure 2D CN. The apparent quantum yields (AQYs) of BMCN-50 at 420 nm, 435 nm, 450 nm, and 550 nm are 4.2%, 4.0%, 3.6%, and 0.5%, respectively, which are higher than those of 2D CN (3.2%, 0.9%, 0.2%, and 0%). Besides, BMCN showed stable H2 evolution performance even after being immersed in 10% TEOA solution for three months. This work presents an easy strategy to prepare a wide spectral response carbon nitride photocatalyst with a stable mesoporous nanostructure for more efficient photocatalytic H2 evolution reaction.
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Developing efficient, highly stable, and cheap photocatalysts are the keys to the industrial application of photocatalytic techniques. For the photocatalytic reactions, how to promote the separating of photogenerated carriers and construct active sites are crucial challenges. Herein, Ni 3 C nanoparticles are loaded on 2D g‐C 3 N 4 as electron‐transferring centers. The mechanism of interface charge transfer in the photocatalytic reactions is studied. Benefited from the formed Schottky junction and the special activation effect of Ni 3 C, Ni 3 C/2D g‐C 3 N 4 owns better separation efficiency of carriers and more active sites to produce ⋅O 2 − and ⋅OH species, which can enhance the photocatalytic activity. Finally, a highest rate of 90.3% for rhodamine B (Rh B) degradation is realized by the optimal proportion of Ni 3 C/2D g‐C 3 N 4 . In addition, the increased photocurrent intensity and stronger signals of active species of Ni 3 C/2D g‐C 3 N 4 indicate the dual functions of Ni 3 C in both promoting the separation of carriers and the production of the active oxidation species.
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