Herein, boron-doped g-C₃N₄ (BCN) is first modified with perylene diimide (PDI) nanosheets driven by the π−π interactions, and subsequently decorated with nanosized Ag through the photodeposition method. The optimal PDI/BCN-Ag photocatalyst achieves a H₂O₂ production rate of 143 μmol g⁻¹ h⁻¹ without any sacrificial agents under visible light irradiation, which is about13-fold improvement compared with pristine g-C₃N₄. The boosted photoactivity is mainly ascribe to the enhanced charge separation due to the cascade S-scheme charge transfer between the coupled PDI and BCN, and the promoted oxygen activation from the introduced nanosized Ag by means of the time-resolved surface photovoltage responses and fluorescence spectra, kelvin probe measurement analyses, O₂ temperature-programmed desorption and electron paramagnetic resonance spectroscopy. Notably, there is a dual channel for H₂O₂ production on PDI/BCN-Ag. The two-electron oxygen reduction dominated by the produced •O₂⁻ radicals occurs on the Ag nanoparticles, whereas the two-electron water oxidation occurs on the PDI.

在此，硼掺杂的 gC ₃ N ₄ (BCN) 首先用由 π-π 相互作用驱动的苝二酰亚胺 (PDI) 纳米片进行修饰，随后通过光沉积方法用纳米级 Ag 进行修饰。优化的PDI/BCN-Ag光催化剂在可见光照射下无需任何牺牲剂即可实现143 μmol g ^{− 1} h ^{− 1}的H ₂ O ₂产率，与原始gC ₃ N _{4相比提高约13倍}. 增强的光活性主要归因于耦合的 PDI 和 BCN 之间的级联 S 型电荷转移导致电荷分离增强，以及通过时间分辨表面光电压响应和荧光光谱从引入的纳米级 Ag 促进氧活化，开尔文探针测量分析，O ₂程序升温解吸和电子顺磁共振光谱。值得注意的是，在 PDI/BCN-Ag 上有一个用于 H ₂ O _{2生产的双通道。由产生的•O 2} ^-自由基主导的双电子氧还原发生在Ag 纳米颗粒上，而双电子水氧化发生在PDI 上。