Heterojunction construction has been proved to be an effective way to enhance photocatalysis performance. In this work, Cl-doped carbon nitride nanofibers (Cl–CNF) with broadband light harvesting capacity were in situ grown on carbon nitride nanosheets (CNS) by a facile hydrothermal method to construct a type II heterojunction. Benefiting from the joint effect of the improved charge carriers separation efficiency and a broadened visible light absorption range, the optimal heterostructure of Cl–CNF/CNS exhibits a H₂O₂ evolution rate of 247.5 μmol g⁻¹ h⁻¹ under visible light irradiation, which is 3.4 and 3.1 times as much as those of Cl–CNF (72.2 μmol g⁻¹ h⁻¹) and CNS (80.2 μmol g⁻¹ h⁻¹), respectively. Particularly, the heterojunction nanostructure displays an apparent quantum efficiency of 23.67% at 420 nm. Photoluminescence spectra and photocurrent measurements both verified the enhanced charge carriers separation ability. Our work provides a green and environmentally friendly strategy for H₂O₂ production by elaborate nanostructure design.

中文翻译：

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在氮化碳纳米片上生长窄带隙 Cl 掺杂氮化碳纳米纤维用于高效光催化 H2O2 生成

异质结结构已被证明是提高光催化性能的有效途径。在这项工作中，通过简便的水热法在氮化碳纳米片（CNS）上原位生长具有宽带光捕获能力的Cl掺杂氮化碳纳米纤维（Cl-CNF），以构建II型​​异质结。受益于电荷载流子分离效率提高和可见光吸收范围扩大的共同作用，Cl-CNF/CNS的最佳异质结构在可见光照射下的H ₂ O ₂释放速率为247.5 μmol g ^-1 h ^-1，分别是 Cl-CNF 的 3.4 和 3.1 倍（72.2 μmol g ^-1 h ^-1) 和CNS (80.2 μmol g ^-1 h ^-1 )。特别是，异质结纳米结构在 420 nm 处显示出 23.67% 的表观量子效率。光致发光光谱和光电流测量均验证了增强的电荷载流子分离能力。我们的工作通过精细的纳米结构设计为 H ₂ O ₂的生产提供了一种绿色环保的策略。