Photoelectrochemical and photocatalytic activity of tungsten doped TiO2 nanotube layers in the near visible region
Identifieur interne : 006831 ( Main/Exploration ); précédent : 006830; suivant : 006832Photoelectrochemical and photocatalytic activity of tungsten doped TiO2 nanotube layers in the near visible region
Auteurs : C. Das [Allemagne] ; I. Paramasivam [Allemagne] ; N. Liu [Allemagne] ; P. Schmuki [Allemagne]Source :
- Electrochimica acta [ 0013-4686 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Photoélectrochimie, Photocatalyse, Tungstène VI Oxyde, Matériau dopé, Titane IV Oxyde, Nanotube, Anodisation, Titane alliage, Tungstène alliage, Alliage binaire, Rayonnement visible, Courant photoélectrique, Microscopie électronique balayage, Photolyse, Rhodamine, Cinétique, Structure surface, Morphologie, Colorant basique, Colorant xanthénique.
English descriptors
- KwdEn :
- Anodizing, Basic dye, Binary alloy, Doped materials, Kinetics, Morphology, Nanotube, Photocatalysis, Photoelectric current, Photoelectrochemistry, Photolysis, Rhodamine, Scanning electron microscopy, Surface structure, Titanium IV Oxides, Titanium alloy, Tungsten VI Oxides, Tungsten alloy, Visible radiation, Xanthene dye.
Abstract
In the present work we study the effect of WO3 doping on the photo-electrochemical behavior of self-organized TiO2 nanotube layers. Mixed oxide nanotubes were grown by anodization of Ti-W alloys containing 0.2 and 9% W, with a thicknesses of the oxide nanotube layers adjusted to about 1.1-1.2 μm. We show that by WO3 doping, the near visible photoresponse and photocatalytic performance can drastically be enhanced. While a content of 9 at% WO3 in photoresponse experiments is most beneficial, in long term experiments a higher efficiency is observed for the 0.2 at% W content. This is due to a gradual leaching of W03 (dissolution into the electrolyte) for the higher WO3 content. This demonstrates that under optimized WO3 doping conditions a lasting visible light activation of TiO2 nanotubes can be achieved.
Affiliations:
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Le document en format XML
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<term>Morphology</term>
<term>Nanotube</term>
<term>Photocatalysis</term>
<term>Photoelectric current</term>
<term>Photoelectrochemistry</term>
<term>Photolysis</term>
<term>Rhodamine</term>
<term>Scanning electron microscopy</term>
<term>Surface structure</term>
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<term>Titanium alloy</term>
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<term>Visible radiation</term>
<term>Xanthene dye</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Photoélectrochimie</term>
<term>Photocatalyse</term>
<term>Tungstène VI Oxyde</term>
<term>Matériau dopé</term>
<term>Titane IV Oxyde</term>
<term>Nanotube</term>
<term>Anodisation</term>
<term>Titane alliage</term>
<term>Tungstène alliage</term>
<term>Alliage binaire</term>
<term>Rayonnement visible</term>
<term>Courant photoélectrique</term>
<term>Microscopie électronique balayage</term>
<term>Photolyse</term>
<term>Rhodamine</term>
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<front><div type="abstract" xml:lang="en">In the present work we study the effect of WO<sub>3</sub>
doping on the photo-electrochemical behavior of self-organized TiO<sub>2</sub>
nanotube layers. Mixed oxide nanotubes were grown by anodization of Ti-W alloys containing 0.2 and 9% W, with a thicknesses of the oxide nanotube layers adjusted to about 1.1-1.2 μm. We show that by WO<sub>3</sub>
doping, the near visible photoresponse and photocatalytic performance can drastically be enhanced. While a content of 9 at% WO<sub>3</sub>
in photoresponse experiments is most beneficial, in long term experiments a higher efficiency is observed for the 0.2 at% W content. This is due to a gradual leaching of W<sub>0</sub>
3 (dissolution into the electrolyte) for the higher WO<sub>3</sub>
content. This demonstrates that under optimized WO<sub>3</sub>
doping conditions a lasting visible light activation of TiO<sub>2</sub>
nanotubes can be achieved.</div>
</front>
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<name sortKey="Liu, N" sort="Liu, N" uniqKey="Liu N" first="N." last="Liu">N. Liu</name>
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<name sortKey="Schmuki, P" sort="Schmuki, P" uniqKey="Schmuki P" first="P." last="Schmuki">P. Schmuki</name>
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