Many studies have been devoted to enhancing photocatalytic activity of hydrogen generation by water splitting in recent years. Herein, a well-defined 3D flowerlike mesoporous photocatalyst (kermesinus BiOI, K-BiOI) was successfully prepared through UV-Vis-Light driving method. The X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and surface photovoltage (SPV) tests confirmed that the oxygen vacancies (OVs) were introduced onto the surface of BiOI, which resulted that the color of BiOI changed from normal orange to kermesinus. The successful introduction of OVs led to the absorption range of K-BiOI stretched. Although the OVs are introduced on the surface, the main body of the material is still BiOI. Furthermore, K-BiOI exhibited a remarkably improved hydrogen production rate of 6.51 mmol g^-1 h^-1 under UV-Vis-light irradiation, which was 21-fold higher than that of BiOI under UV light irradiation. The OVs on the K-BiOI surface could form a defect state lying near the conduction band minimum of the photocatalyst and act as an electron scavenger delaying the photogenerated carrier recombination during the photoreaction process. The present work provides a new approach to introduce OVs on the surface of BiOI, which can provide a new strategy of catalyst preparation for the efficient H₂ production.

近年来，许多研究致力于通过水分解来增强氢产生的光催化活性。在此，通过UV-Vis-Light驱动方法成功地制备了定义明确的3D花状介孔光催化剂（Kermesinus BiOI，K-BiOI）。X射线光电子能谱（XPS），电子顺磁共振（EPR）和表面光电压（SPV）测试证实，氧空位（OVs）被引入BiOI的表面，导致BiOI的颜色从正常的橙色变为到kermesinus。OV的成功引入导致K-BiOI的吸收范围扩大。尽管将OVs引入表面，但材料的主体仍为BiOI。此外，K-BiOI的氢气产生速率显着提高，为6.51 mmol g ^-1紫外可见光照射下的h ^-1值比紫外光照射下BiOI的h ^-1高21倍。K-BiOI表面上的OV可能形成缺陷态，位于光催化剂的导带最小值附近，并充当电子清除剂，从而延迟了光反应过程中光生载流子的复合。目前的工作提供了一种在BiOI的表面上引入OV的新方法，这可以为高效生产H ₂提供催化剂制备的新策略。