Journal
CHEMPLUSCHEM
Volume 81, Issue 11, Pages 1202-1208Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201600351
Keywords
2D La2Ti2O7; heterojunctions; photocatalysis; quantum dots; quantum effect
Categories
Funding
- Applied Basic Research Programs of Yunnan Science and Technology Department [201601YB00002]
- Program of Introducing Talents of Kunming University [YJL16003]
- NSFC [21603111]
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A heterojunction of a perovskite-type La2Ti2O7 (LTO)/CdS quantum dot (QD) nanocomposite was prepared by the chemical bath deposition method. The solar-light-driven H-2 generation results show that this CdS QDs/LTO heterojunction exhibits great improvement in the photocatalytic H-2 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.
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