Enhanced Solar Hydrogen Generation by a Heterojunction of Perovskite-type La₂ Ti₂ O₇ Nanosheets Doped with CdS...

A heterojunction of a perovskite-type La₂ Ti₂ O₇ (LTO)/CdS quantum dot (QD) nanocomposite was prepared by the chemical bath deposition method. The solar-light-driven H₂ generation results show that this CdS QDs/LTO heterojunction exhibits great improvement in the photocatalytic H₂ production and its photoelectrochemical properties in comparison with pure CdS QDs and LTO nanosheets. A possible enhanced mechanism of photoinduced interfacial charge transfer between CdS and LTO is proposed for the heterojunction. The shift of the CdS conduction band (CB) edge can enlarge the CB potential difference between CdS QDs and LTO, enhancing transferred driven force of the interfacial electrons and finally improving the two components' separation activity of photogenerated carriers. This study provides a promising method for constructing an efficient photoinduced interfacial charge transfer over LTO and CdS QD heterojunctions for photocatalytic hydrogen production.