The development of bifunctional photocatalysts for enhancing hydrogen (H₂) and hydrogen peroxide (H₂O₂) production from water is essential in addressing environmental and energy issues. However, the practical implementation of photocatalytic technology is still constrained by the inadequate separation of photo-generated charge carriers. Herein, potassium (K) atoms are introduced into the interlayers of graphitic carbon nitride (g-C₃N₄) with a hollow hexagonal structure (K-TCN) and are coordinated with N atoms in adjacent layers. The presence of K–N coordination serves as a layer bridge, facilitating the separation of charge carriers. The hollow hexagonal structure reduces the distance over which photogenerated electrons migrate to the surface, thereby enhancing the reaction kinetics. Consequently, the optimized K-TCN exhibits a dramatically improved photocatalytic H₂ (941.6 μmol g⁻¹h⁻¹ with platinum (Pt) as the cocatalyst) and H₂O₂ (347.6 μmol g⁻¹h⁻¹) generation as compared to hollow g-C₃N₄ (TCN) and bulk g-C₃N₄ nanosheet (CN) without K–N bridge under visible light irradiation. The unique design holds promising potential for developing highly efficient bifunctional photocatalysts towards producing renewable fuels and value-added chemicals.

开发双功能光催化剂以提高从水中生产氢气（H ₂）和过氧化氢（H ₂ O ₂）对于解决环境和能源问题至关重要。然而，光催化技术的实际应用仍然受到光生载流子分离不充分的限制。这里，钾(K)原子被引入到具有中空六方结构(K-TCN)的石墨碳氮化物(gC ₃ N ₄ )的层间，并与相邻层中的N原子配位。K-N 配位的存在充当层桥，促进电荷载流子的分离。空心六边形结构减少了光生电子迁移到表面的距离，从而增强了反应动力学。因此，与相比，优化的K-TCN表现出显着改善的光催化H ₂ (941.6 μmol g ^-1 h ^-1，以铂(Pt)作为助催化剂)和H ₂ O ₂ (347.6 μmol g ^-1 h ^-1 )生成。在可见光照射下，形成没有K-N桥的空心gC ₃ N ₄ (TCN)和块状gC ₃ N _{4纳米片(CN)。}这种独特的设计在开发高效双功能光催化剂以生产可再生燃料和增值化学品方面具有广阔的前景。