Influence of annealing temperatures on the properties of low aspect-ratio TiO2 nanotube layers

Das, Sayantan; Zazpe, Raúl; Přikryl, Jan; Knotek, Petr; Krbal, Miloš; Sopha, Hanna; Podzemná, Veronika; Macák, Jan M.

doi:10.1016/j.electacta.2016.07.135

Cited by 84 publications

(66 citation statements)

References 34 publications

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“…Additionally, the IPCE values presented here were also affected by tuning of the chromophore composition by annealing conditions 18,31 . Recently, we have reported that the optimal annealing protocol for low-aspect ratio TiO 2 nanotube layers is 400 °C for 1 h in order to obtain the best photo-electrochemical response 32 . It is known from the literature that the best performance of chalcogenide-based solar cell devices is achieved when annealed over 500 °C.…”

Section: Heterostructured Photo-chemical Half-cells Of Tio 2 Nanotubementioning

confidence: 99%

TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

et al. 2017

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We present photo-electrochemical results for anodic TiO 2 nanotube layers grown with different diameter sizes (21, 35, 56 and 95 nm) with a thickness of approx. 560 nm using a novel anodization protocol. These tube layers were utilized as highly ordered n-type conductive scaffold for the inorganic chromophore Sn-S-Se. While downscaling the nanotube diameter significantly increased the number of nanotubes per square unit (from 5.6E+09 to 7.2E+10 pcs/cm 2 ) and thus the active surface area increased as well, we found that the photoelectrochemical response in the UV light was identical and thus independent of the TiO 2 nanotube diameter in the range of nanotube diameters from 35 to 95 nm. Further, we demonstrate that a heterostructured photo-electrochemical cell consisting of TiO 2 nanotubes sensitized with crystalline Sn-S-Se chromophore showed higher photocurrent density (from 6 to 32 µA/cm 2 for the wavelength of 460 nm) with increasing nanotube diameter size. Upon detailed SEM analyses it was revealed that the Sn-S-Se was infilled in all nanotube layers approximately to one third of the thickness. Therefore, this photocurrent increase with increasing tube diameter can be ascribed to better interfacial contact (and improved charge transport) facilitated between the chromophore and nanotube walls.

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Section: Heterostructured Photo-chemical Half-cells Of Tio 2 Nanotubementioning

confidence: 99%

TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

et al. 2017

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“…As shown in Figure S2c, the diffraction peaks at 2θ=27.44 and 36.08° are attributed to the (110) and (101) rutile phase of TiO 2 (JCPDS No. 21‐1276) . The peaks at 2θ=25.28, 48.05, 53.89, and 55.62° correspond to the (101), (200), (105), and (211) phases of anatase TiO 2 (JCPDS No.…”

Section: Resultsmentioning

confidence: 99%

“…. [32] The peaks at 2θ = 25.28, 48.05, 53.89, and 55.62°c orrespond to the (101), (200), (105), and (211) phases of anatase TiO 2 (JCPDS No. 21-1272).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

Dhandole

Park

et al. 2019

ChemCatChem

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In this study, we demonstrate the enhanced photoelectrochemical (PEC) performance of the titanium foil based TiO2 nanotube (TNT) array through a simple hydrothermal (HT) acid treatment method. The influence of hydrochloric acid (HCl) concentration variation in HT method on morphology and the photoelectrochemical performances of TNTs nanostructures were studied. Field Emission Scanning Electron Microscopy and X‐ray powder diffraction results confirmed the morphology and crystal structure easily restructured during HCl assisted one step in‐situ hydrothermal approach. The photocurrent density of optimized acid treated TiO2 nanotube (TH‐40) electrode was observed to be 2‐times higher than the pristine TNT electrode. Thereafter, TH‐40 sample exhibited noticeably photoelectrochemical solar hydrogen production of 66 μmol and 82 μmol in NaOH and Na2S/Na2SO3 electrolytes respectively than the pristine TNT. The enhancement of photocatalytic activity was ascribed to the restructured morphology, as well as the efficient charge separation at rutile‐anatase interface in the TH‐40 sample as well as at the electrode‐electrolyte interface. A hydrochloric acid assisted one step in‐situ hydrothermal approach tailors the crystal structure and morphological features, which enhanced the photoelectrochemical properties of TiO2 nanotube.

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“…Preparation of TiO 2 Nanotube Layers : Titanium (Ti) foils were anodized in ethylene glycol based electrolyte containing 10% water and 0.15 m NH 4 F at 100 V at room temperature using a high‐voltage potentiostat (PGU‐200V, IPS Elektroniklabor GmbH) to fabricate TiO 2 nanotube layers of thicknesses ≈5 µm and inner diameters ≈230 nm. Subsequently, the TiO 2 nanotube layers were annealed at 400 °C, to obtain crystalline nanotube layers in anatase phase which improves their electrical conductivity …”

Section: Methodsmentioning

confidence: 99%

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

Krbal

Zazpe

et al. 2017

Adv Materials Inter

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in the materials science community. [2] Apart from the generation of H 2 and O 2 gases, photocatalysis can be extended to other applications. The early works on the irradiation of TiO 2 for purification of water via photocatalytic decomposition of pollutants were demonstrated by Frank and Bard in late 1970s. [3][4][5] These initial works and many reports later have shown that photooxidation of inorganic and organic contaminants is a promising route for environmental remediation. [6][7][8][9][10][11][12] In fact, the key factors that determine the efficiencies of a photocatalyst include its light harvesting capability and reduced charge carriers recombination of the photo generated electron-hole pairs. [3,13] However, TiO 2 possesses rather wide bandgap energies between 3.0 and 3.2 eV, with high photo activity only in the UV region (λ ≤ 390 nm) equivalent to only ≈5% of the solar spectrum. [14,15] Nevertheless, owing to its nontoxicity, low-cost synthesis, chemical inertness, and resistance against photocorrosion, TiO 2 has been long studied and recognized as the most promising photocatalyst material. [13,16] In order to harness more from the abundant renewable energy source, that is, solar energy, tremendous efforts have been devoted to reduce the bandgap energy of TiO 2 and broaden its optical absorption to the visible region. [8,[13][14][15]17,18] Bandgap engineering has been extensively carried out Ultrathin molybdenum oxyselenide (MoSe x O y ) coatings are made first ever by atomic layer deposition (ALD) within anodic 1D TiO 2 nanotube layers for photoelectrochemical and photocatalytic applications. The coating thickness is controlled through varying ALD cycles from 5 to 50 cycles (corresponding to ≈1-10 nm). In the ultraviolet region, the coatings have enhanced up to four times the incident photon-to-current conversion efficiency (IPCE), and the highest IPCE is recorded at 32% at (at λ = 365 nm). The coatings notably extend the photoresponse to the visible spectral region and remarkable improvement of photocurrent densities up to ≈40 times is registered at λ = 470 nm. As a result, the MoSe x O y -coated-TiO 2 nanotube layers have shown to be an effective photocatalyst for methylene blue degradation, and the optimal performance is credited to a coating thickness between 2 and 5 nm (feasible only by ALD). The enhancement in photoactivities of the presented heterojunction is mainly associated with the passivation effect of MoSe x O y on the TiO 2 nanotube walls and the suitability of bandgap position between MoSe x O y and TiO 2 interface for an efficient charge transfer. In addition, MoSe x O y possesses a narrow bandgap, which favors the photoactivity in the visible spectral region.

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Influence of annealing temperatures on the properties of low aspect-ratio TiO2 nanotube layers

Cited by 84 publications

References 34 publications

TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

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Influence of annealing temperatures on the properties of low aspect-ratio TiO2 nanotube layers

Cited by 84 publications

References 34 publications

TiO2 Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

TiO2 Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

Enhanced Charge Transfer Process in Morphology Restructured TiO2 Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

MoSexOy‐Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light‐Driven Applications

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TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

TiO₂ Nanotube/Chalcogenide-Based Photoelectrochemical Cell: Nanotube Diameter Dependence Study

Enhanced Charge Transfer Process in Morphology Restructured TiO₂ Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications