Abstract
The critical factor affecting the activity of photocatalytic hydrogen production is always the rapid recombination of photocarriers. In this paper, we construct an efficient and stable fluorinated-TiO2/Zn0.2Cd0.8S-diethylenetriamine (F-TiO2/ZCSD) heterostructure, and a novel structure modified by ZCSD nano-flowers was grown in situ on the surface of 2D F-TiO2 nanosheets via hydrothermal method. ZCSD has suitable valence and conduction band positions. Under visible light, photo-generated electrons are transferred to the F-TiO2 plane with defects. At this time, the potential well formed at the defect binds the electrons in it, which greatly restrains the recombination of the photo-induced electrons and the holes. Therefore, the photocatalytic hydrogen evolution rate of 20%F-TiO2/ZCSD is 13.5 mmol·g−1·h−1, which is 2.4 folds greater than that of ZCSD. Furthermore, the structure of the composite has not been damaged after six cycles of the test, which indicates that the composite has excellent photostability.
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