ZnO-Au-SnO 2 Z-scheme photoanodes for remarkable photoelectrochemical water splitting

Jing Mei Li, Hao Yun Cheng, Yi Hsuan Chiu, Yung-Jung Hsu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

For the first time a ZnO nanorod-based Z-scheme heterostructure system was proposed and realized for efficient photoelectrochemical water splitting. The samples were prepared by depositing a thin layer of SnO 2 on the Au surface of Au particle-decorated ZnO nanorods. For ZnO-Au-SnO 2 nanorods, the embedded Au can mediate interfacial charge transfer by promoting electron transfer from the conduction band of SnO 2 to the valence band of ZnO. This vectorial charge transfer resulted in the situation that the photoexcited electrons accumulated at ZnO while the photogenerated holes concentrated at SnO 2 , giving ZnO-Au-SnO 2 substantially high redox powers. Time-resolved photoluminescence spectra suggested that the interfacial charge transfer across the ZnO/Au/SnO 2 interface was significantly improved as a result of the Z-scheme charge transfer mechanism. With the substantially high redox powers and significantly improved interfacial charge transfer, ZnO-Au-SnO 2 nanorods performed much better as a photoanode in photoelectrochemical water splitting than pristine ZnO, plasmonic Au-decorated ZnO and type-II SnO 2 -coated ZnO nanorods did. The present study has provided a viable approach to exploit Z-scheme photoanodes in the design of efficient artificial photosynthesis systems for solar energy conversion.

Original languageEnglish
Pages (from-to)15720-15729
Number of pages10
JournalNanoscale
Volume8
Issue number34
DOIs
StatePublished - 14 Sep 2016

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