Coupling narrow-band semiconductors with TiO₂ photocatalysts is a promising avenue for simultaneously broadening their light absorption and accelerating charge separation, thus improving the solar-driven hydrogen generation. In this work, we devise a unique TiO₂@CuInS₂ heterojunction photocatalyst through embedding CuInS₂ nanoparticles into mesoporous TiO₂ nanofibers. The obtained TiO₂@CuInS₂ nanojunction possessed intimate interfacial contact, which efficiently promoted the charge separation, thus resulting in enhanced photocatalytic hydrogen production activity both under visible light and AM1.5 irradiation. After optimizing the component ratio of CuInS₂, the corresponding TiO₂@CuInS₂ sample delivered a significantly boosted photocatalytic H₂ production activity without any co-catalytic noble metals, up to 3 times as high as that of pure TiO₂ under AM1.5 irradiation. This study may provide new insights for designing and constructing highly efficient photocatalysts for solar hydrogen production.

中文翻译：

---

嵌入介孔TiO2纳米纤维中的CuInS2纳米颗粒可促进光催化制氢

窄带半导体与TiO ₂光催化剂的耦合是一种有前途的途径，可以同时扩大其光吸收范围并加速电荷分离，从而改善太阳能驱动氢的产生。在这项工作中，我们通过将CuInS ₂纳米粒子嵌入到介孔TiO ₂纳米纤维中，设计出一种独特的TiO ₂ @CuInS ₂异质结光催化剂。所得的TiO ₂ @CuInS ₂纳米结具有紧密的界面接触，有效地促进了电荷分离，从而在可见光和AM1.5辐照下均提高了光催化制氢活性。优化CuInS的成分比后_{如图2所示}，相应的TiO ₂ @CuInS ₂样品在没有任何助催化贵金属的情况下，显着提高了光催化H _2的生产活性，是AM1.5辐照下纯TiO _2的三倍。这项研究可能为设计和构建用于生产太阳能氢的高效光催化剂提供新的见解。