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Enhanced photocatalytic and photoelectrochemical activity in the ternary hybrid of CdS/TiO2/WO3 through the cascadal electron transfer

Authors
Kim, Hyoung-ilKim, JungwonKim, WooyulChoi, Wonyong
Issue Date
May-2011
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry C, v.115, no.19, pp 9797 - 9805
Pages
9
Journal Title
Journal of Physical Chemistry C
Volume
115
Number
19
Start Page
9797
End Page
9805
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159091
DOI
10.1021/jp1122823
ISSN
1932-7447
1932-7455
Abstract
The composite of different semiconductor nanoparticles may facilitate the charge separation and transfer because the difference in the band edge positions creates the potential gradient at the composite interface. For this purpose, the CdS-TiO2-WO3 ternary hybrid was successfully synthesized and characterized for the structural, optical, and morphological properties by X-ray diffraction, diffuse reflectance UV/visible absorption spectroscopy, high-resolution transmission electron micrography, and energy-dispersive X-ray analysis. The photocatalytic activity was tested by monitoring the photoreduction of polyoxometalate (POM: PMo12O 40) spectrophotometrically. The photoelectrochemical (PEC) property of the ternary hybrid electrode was also characterized by the linear sweep voltammetry, and the incident photon-to-current conversion efficiency was measured as a function of wavelength. The results of both the POM reduction and photocurrent tests indicated that the photocatalytic and PEC activities of the CdS-TiO2-WO3 ternary hybrid are much higher than those of bare CdS and any binary hybrids. The enhanced activity could be attributed to the cascadal electron transfer from CdS to TiO 2 to WO3 through the interfacial potential gradient in the ternary hybrid conduction bands. Such a cascadal electron transfer in the h
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