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Highly Efficient Photoelectrochemical Hydrogen Generation Using ZnxBi2S3+x Sensitized Platelike WO3 Photoelectrodes
journal contribution
posted on 2015-05-27, 00:00 authored by Canjun Liu, Yahui Yang, Wenzhang Li, Jie Li, Yaomin Li, Qilin Shi, Qiyuan ChenZnxBi2S3+x sensitized platelike WO3 photoelectrodes on FTO substrates were for the first time
prepared via a sequential ionic layer adsorption reaction (SILAR)
process. The samples were characterized by scanning electron microscopy
(SEM), transmission electron microscopy (TEM), ultraviolet visible
spectrometry (UV–vis), and Raman spectra. The results show
that the ZnxBi2S3+x quantum dots (QDs) are uniformly coated on the entire
surface of WO3 plates, forming a WO3/ZnxBi2S3+x core/shell structure. The ZnxBi2S3+x/WO3 films show
a superior ability to capture visible light. High-efficiency photoelectrochemical
(PEC) hydrogen generation is demonstrated using the prepared electrodes
as photoanodes in a typical three-electrode electrochemical cell.
Compared to the Bi2S3/WO3 photoelectrodes,
the ZnxBi2S3+x/WO3 photoelectrodes exhibit good photostability
and excellent PEC activity, and the photocurrent density is up to
7.0 mA cm–2 at −0.1 V versus Ag/AgCl under
visible light illumination. Investigation of the electron transport
properties of the photoelectrodes shows that the introduction of ZnS
enhances the photoelectrons’ transport rate in the photoelectrode.
The high PEC activity demonstrates the potential of the ZnxBi2S3+x/WO3 film as an efficient photoelectrode for hydrogen generation.
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SILARhydrogen generationBi 2S photoelectrodeslayer adsorption reactionZnxBi 2S films showFTOWO 3 platesUVZnxBi 2S Sensitized Platelike WO 3 PhotoelectrodesZnxBi 2SZnxBi 2S filmTEMPEC activitySEMscanning electron microscopyplatelike WO 3 photoelectrodesZnxBi 2S quantum dotsZnxBi 2S photoelectrodes exhibitEfficient Photoelectrochemical Hydrogen Generationelectron transport propertiesQD
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