Graphitic carbon nitride (g-C₃N₄) has emerged as a promising photocatalyst, but poor charge separation and low surface area limit its activity. Here, we report a hydrothermal method to generate hydrogen bonded supramolecular complex via water-based homogeneous supramolecular assembly, which is a promising precursor to fabricate porous and oxygen-doped g-C₃N₄. The hydrothermal treatment provides a homogeneous environment for hydrolysis of melamine to produce cyanuric acid and reaction of cyanuric acid with remained melamine to create the in-plane ordering and hydrogen bonded supramolecular complex. The complex can template uniform nanoporous structure and also provide an opportunity for O-doping in the g-C₃N₄ network upon calcination in air. The resulted g-C₃N₄(GCN-4) possesses high surface area, well-defined 3D morphology and oxygen-dopant in the lattice. Subsequently, the visible light absorption, charge separation, and wettability are considerably enhanced. This catalyst exhibits higher hydrogen evolution rate by 11.3 times than the bulk g-C₃N₄ under visible light irradiation, with apparent quantum efficiency of 10.3% at 420 nm.

中文翻译：

---

通过水基均相超分子组装的氧掺杂纳米多孔碳氮化物用于光催化氢的释放

石墨碳氮化物（gC ₃ N ₄）已成为一种有前途的光催化剂，但电荷分离差和表面积低限制了其活性。在这里，我们报告水热法通过水基均相超分子组装产生氢键合的超分子复合物，这是一种有前途的前驱体，可制备多孔和掺杂氧的gC ₃ N ₄。水热处理为三聚氰胺的水解产生氰尿酸提供了均匀的环境，并使氰尿酸与残留的三聚氰胺反应生成面内有序和氢键合的超分子配合物。该复合物可以模板化均匀的纳米孔结构，并且还提供了在gC中进行O掺杂的机会在空气中煅烧形成₃ N ₄网络。所得的gC ₃ N ₄（GCN-4）具有较高的表面积，清晰的3D形态和晶格中的氧掺杂剂。随后，可见光吸收，电荷分离和润湿性大大提高。在可见光照射下，该催化剂的氢析出速率比体相gC ₃ N _4的氢释放速率高11.3倍，在420 nm处的表观量子效率为10.3％。