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- W2086978480 abstract "Abstract The effect of the anodizing potential on the photoelectrochemical properties of (Nb-doped)-TiO2 Nanotubes (NTs) has received little attention to date within the research community. Our study to understand the photochemistry of the NTs reveals a clear impact of the anodizing potential (15 to 60 V) on the microstructure and the electron transport properties of the NTs. At 15 V, the NTs film develops very slowly and is either too thin to absorb light effectively (after 20 minutes anodization) or too damaged (after 60 minutes), due to excessive dissolution by the electrolyte causing collapsing and bundling of the NTs. Consequently the 1D electron transport (associated with well-defined, undamaged NTs) is lost and the photoresponse is poor (~ 0.6 mA/cm2 at 1 V vs RHE). An anodizing potential of 30 V appears instead to be optimal as it ensures a good balance between the growth and dissolution of the oxide; NTs obtained under these conditions provide a remarkable photocurrent density up to ~ 1.2 mA/cm2. When anodizing at 45-60 V instead, the oxidation proceeds too fast, inducing the formation of cracks within the anodic film, making the anodizing process more difficult to control, although in general a good photoresponse (0.9 ÷ 1.0 mA/cm2) is still observed. Other than a small contribution (" @default.
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- W2086978480 date "2015-07-01" @default.
- W2086978480 modified "2023-09-24" @default.
- W2086978480 title "Impact of the Anodizing Potential on the Electron Transport Properties of Nb-doped TiO2 Nanotubes" @default.
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- W2086978480 doi "https://doi.org/10.1016/j.electacta.2015.04.070" @default.
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