Highly efficient photoelectrochemical and photocatalytic anodic TiO2 nanotube layers with additional TiO2 coating
ČlánekOtevřený přístuppeer-reviewedpublishedSoubory
Datum publikování
2017
Autoři
Sopha, H
Krbal, Milos
Ng, S
Přikryl, Jan
Zazpe, Raul
Yam, F.K.
Macák, Jan
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Elsevier
Abstrakt
In this work, strong beneficial effects of thin and uniform TiO2 coatings within TiO2 nanotube layers for photocurrent generation and photocatalytical degradation of methylene blue are demonstrated for the first time. TiO2 nanotube layers were coated by TiO2 of various thicknesses (from 2.8 nm to 22 nm) using atomic layer deposition (ALD) and compared with TiO2 nanotube layers decorated by TiO2 nanoparticles (using established TiCl4 treatment) and with blank (uncoated) layers. By means of photocurrent measurements and cyclic voltammetry, it is demonstrated that the most efficient charge carrier separation can be achieved for TiO2 nanotube layers with an optimal ALD TiO2 coating thickness ≈11 nm. Significant differences in flatband potentials and carrier density among all nanotube layers were revealed by Mott-Schottky measurements. Photocatalytic decomposition rates for methylene blue solutions were significantly enhanced for ALD TiO2 coated TiO2 nanotube layers compared to their uncoated or TiO2 nanoparticles - decorated counterparts. A perfect agreement in trends was obtained for photocurrent and photocatalytic results.
Rozsah stran
p.104-110
ISSN
2352-9407
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Projekt
EC/H2020/638857/EU/Towards New Generation of Solid-State Photovoltaic Cell: Harvesting Nanotubular Titania and Hybrid Chromophores/CHROMTISOL
Zdrojový dokument
Applied Materials Today. 2017. Vol. 9
Vydavatelská verze
http://www.sciencedirect.com/science/article/pii/S2352940717301178
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Attribution-NonCommercial-NoDerivs 4.0
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Atomic layer deposition, Coating, Photocatalysis, Photoelectrochemistry, TiO2 nanotube layers
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Except where otherwised noted, this item's license is described as Attribution-NonCommercial-NoDerivs 4.0