Influence of electrolyte and anodic potentials on morphology of titania nanotubes

Oh, Han-Jun; Kim, In-Ki; Jang, Kyung-Wook; Lee, Jong-Ho; Lee, Seung–Hyun; Chi, Choong-Soo

doi:10.1007/s12540-012-4027-6

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…In addition, in this phase, the process of nucleation and structuring of the pore structure takes place [50]. Phase III is characterized by a slow decrease of the current density due to an increase in the depth of the pores by the preferential dissolution of the titanium oxide at the base of the pores [50,51]. Similar behaviors were obtained for other electrolyte concentrations and applied voltages, as shown in Fig.…”

Section: Growth Of the Nanotubular Coatingssupporting

confidence: 65%

“…As could be seen in Fig. 5b, a higher initial current density and equilibrium current density could be observed with the increase of the applied voltage, causing the formation of longer TiO 2 nanotubes [51,57]. On the other hand, the continuous increase in current density, observed for the 80 V sample, could be due to the fact that the breakdown voltage was reached, avoiding the establishment of the formation-dissolution equilibrium (phase III) [58].…”

Section: Influence Of the Voltagementioning

confidence: 77%

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Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Dwojak

Vera

Traid

et al. 2022

Photochem Photobiol Sci

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The photocatalytic and mechanical performance of TiO 2 nanotubular coatings obtained by anodic oxidation of commercial titanium, using an NH 4 F and 3.5% v/v water in ethylene glycol solution as electrolyte was investigated. After the anodization, the coatings were thermally treated at 450 °C for 2 h. The effects of the anodizing voltage (40-80 V) and NH 4 F concentration (0.06, 0.15, 0.27 M) on the formation of the nanotube arrays were evaluated. Nanotube diameters (57 to 114 nm), wall thicknesses (4 to 13 nm), and lengths (5 to 17 µm) increased with the anodizing voltage and the NH 4 F concentration. The photocatalysts were characterized by scanning electron microscopy, glancing incidence X-ray diffraction, and UV-Vis diffuse reflectance spectroscopy. The mechanical properties of the photocatalysts were determined: adhesion using the tape test (ASTM D3359) and erosion resistance through a 3 h accelerated test. The photocatalytic activity of the nanotubes under UV irradiation was evaluated using hexavalent chromium (Cr(VI)) in the presence of ethylenediaminetetraacetic acid (EDTA), using a 1.25 EDTA/Cr(VI) molar ratio solution at pH 2. A complete Cr(VI) transformation after 3 h of irradiation was obtained for all samples, with a better performance than that of an immobilized P25 sample. The photocatalyst obtained with 0.27 M NH 4 F at 40 V presented a good behavior in adherence and erosion resistance, together with a very good photocatalytic activity. This novel analysis, combining photocatalytic and mechanical tests, proved that the new TiO 2 nanotubular coatings could be successfully used as immobilized photocatalysts in photoreactors for water treatment.

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Section: Growth Of the Nanotubular Coatingssupporting

confidence: 65%

Section: Influence Of the Voltagementioning

confidence: 77%

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Dwojak

Vera

Traid

et al. 2022

Photochem Photobiol Sci

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“…The synthesis of nanostructured titania has witnessed a kind of an explosive growth in recent years. Among different methods used to synthesize nanoporous/nanotubular titania, such as sol–gel, electrodeposition, and hydrothermal method, anodic oxidation is a facile, low cost, and efficient method for acquiring well-defined nanostructures. − The geometric parameters of the anodized titanium dioxide (ATO) are determined by the electrolyte composition, − applied potential, and anodizing temperature . The quality of the nanopore/nanotube arrangement determines potential applications of ATO layers.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment Effect on Crystalline Structure and Photoelectrochemical Properties of Anodic TiO₂ Nanotube Arrays Formed in Ethylene Glycol and Glycerol Based Electrolytes

et al. 2015

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The effect of annealing temperature on crystal structure of anodic titanium dioxide (ATO) layers prepared via anodization in the ethylene glycol and glycerol based electrolytes was studied. Then samples were annealed in air at the temperatures ranging from 400 to 1000 °C. The XRD measurements proved that a gradual phase changes from anatase to rutile occurs with increasing annealing temperature. The anatase-to-rutile transformation occurs between 500 and 600 °C. The changes in the average crystallite sizes of anatase and rutile occurring during heat treatment of ATO layers were correlated with the mechanism of rutile phase nucleation. It was found also that the transition to the rutile phase in the samples formed in the ethylene glycol based electrolyte is considerably retarded and takes place at higher annealing temperatures due to the higher content of the embedded fluoride ions. The photoelectrochemical performance of ATO layers were studied under pulsed UV illumination. Photocurrent vs. incident light wavelength and applied potential plots were recorded. The highest photocurrents were observed for the samples annealed at 400 °C, regardless the electrolyte. It was demonstrated that the decrease in photocurrent values is related with the decreasing amount of the anatase phase in ATO samples. The enhanced photocurrent response was observed for ATO layers decorated with Ag nanoparticles. The highest photoconversion efficiencies, determined by incident photon-to-current efficiency (IPCE) calculations, were observed for the wavelength of 350 nm.

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“…As shown in Figure 1(d) for the 5 cm × 4 cm anode area, the TiO 2 layer is more compact and only some small pits disperse sparsely, no nanotubes are observed; however, Ti is partly etched. Under this condition, the anode area is too large, resulting in the fact that the amount of fluorine ions per square centimeter at the anode surface is less, the rate of the reaction (3) decreases rapidly [54]; thus, the TiO 2 layer is thicker, which results in less electric field dissolution [53]. Therefore, the formation of nanotubes by anodization fails.…”

Section: Influence Of Anode Area On the Top Morphology Ofmentioning

confidence: 99%

Influence of Anode Area and Electrode Gap on the Morphology of TiO₂ Nanotubes Arrays

Wang

Jia

Shuangmei

2013

Journal of Nanomaterials

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In order to fabricate the titanium dioxide (TiO2) nanotubes arrays which were used in the photocatalytic degradation of total volatile organic compounds (TVOC) by anodization, the influence of the electrode gap and anode area on the morphology of the titanium dioxide (TiO2) nanotubes was studied. Titanium dioxide (TiO2) nanotube arrays were prepared by anodization with various electrode gaps and anode areas. Field emission scanning electron microscopy was used to investigate the morphology of the TiO2nanotubes arrays. The results showed that the morphology of TiO2nanotubes arrays was influenced by electrode gap and anode area. The appropriate anode area and electrode gap were 5 cm × 2 cm and 20 mm, respectively. Thus, TiO2nanotube arrays with better morphology (with larger dimension and uniform TiO2nanotubes) were successfully fabricated by anodic oxidation with 5 cm × 2 cm anode area and 20 mm electrode gap at 30 V.

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Influence of electrolyte and anodic potentials on morphology of titania nanotubes

Cited by 13 publications

References 17 publications

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Heat Treatment Effect on Crystalline Structure and Photoelectrochemical Properties of Anodic TiO₂ Nanotube Arrays Formed in Ethylene Glycol and Glycerol Based Electrolytes

Influence of Anode Area and Electrode Gap on the Morphology of TiO₂ Nanotubes Arrays

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Influence of electrolyte and anodic potentials on morphology of titania nanotubes

Cited by 13 publications

References 17 publications

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Photocatalytic and mechanical properties of immobilized nanotubular TiO2 photocatalysts obtained by anodic oxidation: a novel combined analysis

Heat Treatment Effect on Crystalline Structure and Photoelectrochemical Properties of Anodic TiO2 Nanotube Arrays Formed in Ethylene Glycol and Glycerol Based Electrolytes

Influence of Anode Area and Electrode Gap on the Morphology of TiO2 Nanotubes Arrays

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Product

Resources

About

Heat Treatment Effect on Crystalline Structure and Photoelectrochemical Properties of Anodic TiO₂ Nanotube Arrays Formed in Ethylene Glycol and Glycerol Based Electrolytes

Influence of Anode Area and Electrode Gap on the Morphology of TiO₂ Nanotubes Arrays