Preparation of hybrid WO3–TiO2 nanotube photoelectrodes using anodization and wet impregnation: Improved water-splitting hydrogen generation performance

Hybrid tungsten trioxide-titanium dioxide (WO3–TiO2) nanotube photoelectrodes were prepared using simple anodization and wet impregnation. These hybrid nanotube photoelectrodes significantly enhanced their photoelectrochemical (PEC) water-splitting performances compared with pure TiO2 nanotube photo...

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Published inInternational journal of hydrogen energy Vol. 38; no. 5; pp. 2156 - 2166
Main Authors Lai, Chin Wei, Sreekantan, Srimala
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 19.02.2013
Elsevier
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Abstract Hybrid tungsten trioxide-titanium dioxide (WO3–TiO2) nanotube photoelectrodes were prepared using simple anodization and wet impregnation. These hybrid nanotube photoelectrodes significantly enhanced their photoelectrochemical (PEC) water-splitting performances compared with pure TiO2 nanotube photoelectrodes. This study aims to determine the optimum soaking time in ammonium paratungstate used as the tungsten precursor for incorporating WO3 species into TiO2 nanotube photoelectrodes. A low content of WO3 species successfully diffused into the TiO2 lattice and formed W–O–Ti bonds, which significantly promoted effective charge separation by trapping photo-induced electrons from TiO2. Thus, the photocurrent density, photoconversion efficiency, STH efficiency, and H2 generation of the resultant hybrid nanotubes were increased. However, excess WO3 species in the TiO2 nanotubes resulted in poor PEC water-splitting performance. This behavior was attributed to the large agglomerates of WO3 species were covered on the surface nanotubes that formed undesirable layers. Consequently, these undesirable layers would act as recombination sites for photo-induced electrons and holes. ► Hybrid WO3–TiO2 nanotubes were successfully synthesized. ► Formation of W–O–Ti bonding within the lattice of hybrid WO3–TiO2 nanotubes. ► W–O–Ti bonding can act as charge carrier separator under visible illumination. ► Photocurrent density was increased about 1.5 times than that of TiO2 nanotubes.
AbstractList Hybrid tungsten trioxide-titanium dioxide (WO3–TiO2) nanotube photoelectrodes were prepared using simple anodization and wet impregnation. These hybrid nanotube photoelectrodes significantly enhanced their photoelectrochemical (PEC) water-splitting performances compared with pure TiO2 nanotube photoelectrodes. This study aims to determine the optimum soaking time in ammonium paratungstate used as the tungsten precursor for incorporating WO3 species into TiO2 nanotube photoelectrodes. A low content of WO3 species successfully diffused into the TiO2 lattice and formed W–O–Ti bonds, which significantly promoted effective charge separation by trapping photo-induced electrons from TiO2. Thus, the photocurrent density, photoconversion efficiency, STH efficiency, and H2 generation of the resultant hybrid nanotubes were increased. However, excess WO3 species in the TiO2 nanotubes resulted in poor PEC water-splitting performance. This behavior was attributed to the large agglomerates of WO3 species were covered on the surface nanotubes that formed undesirable layers. Consequently, these undesirable layers would act as recombination sites for photo-induced electrons and holes. ► Hybrid WO3–TiO2 nanotubes were successfully synthesized. ► Formation of W–O–Ti bonding within the lattice of hybrid WO3–TiO2 nanotubes. ► W–O–Ti bonding can act as charge carrier separator under visible illumination. ► Photocurrent density was increased about 1.5 times than that of TiO2 nanotubes.
Author Sreekantan, Srimala
Lai, Chin Wei
Author_xml – sequence: 1
  givenname: Chin Wei
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  givenname: Srimala
  surname: Sreekantan
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  email: srimala@eng.usm.my, stevenlai5275@yahoo.com.hk
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Issue 5
Keywords Hybrid WO3–TiO2 nanotubes
Hydrogen
Anodization
Photoelectrochemical
Wet impregnation
Water
Performance evaluation
Photoelectrochemistry
Titanium IV Oxides
Water splitting
Nanotube
Characterization
Impregnation
Tungsten oxide
nanotubes
Hybrid WO
Anodizing
Preparation
Tungsten VI Oxides
Photoelectrolysis
TiO
Titanium oxide
Photoelectrode
Hydrogen production
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Snippet Hybrid tungsten trioxide-titanium dioxide (WO3–TiO2) nanotube photoelectrodes were prepared using simple anodization and wet impregnation. These hybrid...
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elsevier
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StartPage 2156
SubjectTerms Alternative fuels. Production and utilization
Anodization
Applied sciences
Chemistry
Electrochemistry
Energy
Exact sciences and technology
Fuels
General and physical chemistry
Hybrid WO3–TiO2 nanotubes
Hydrogen
Photoelectrochemical
Photoelectrochemistry. Electrochemiluminescence
Wet impregnation
Title Preparation of hybrid WO3–TiO2 nanotube photoelectrodes using anodization and wet impregnation: Improved water-splitting hydrogen generation performance
URI https://dx.doi.org/10.1016/j.ijhydene.2012.12.025
Volume 38
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