Fast growth of self-aligned titania nanotube arrays with excellent transient photoelectric responses

Cao, Changlin; Zhang, Guoshun; Ye, Jian; Hua, Rimao; Sun, Zhaoqi; Cui, Jingbiao

doi:10.1016/j.electacta.2016.05.208

Cited by 24 publications

(15 citation statements)

References 53 publications

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“…Figure 1b shows the cross-sectional view of the un-modified titanium dioxide nanotube arrays with a length about 1.3 µm. Cao et al (2016) applied anodization method to synthesize titanium dioxide nanotube arrays and found that the length of TNAs increases with the time of anodization [35]. Figure 1c,d shows the iron modified titanate nanotube arrays synthesized (Fe/TNAs) via SWVE method with 0.2 and 0.5 M Fe(NO 3 ) 3 •9H 2 O precursor, respectively.…”

Section: Surface Morphology Of Tnas and Fe/tnasmentioning

confidence: 99%

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

et al. 2021

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This study used iron modified titanate nanotube arrays (Fe/TNAs) to remove E. coli in a photoelectrochemical system. The Fe/TNAs was synthesized by the anodization method and followed by the square wave voltammetry electrochemical deposition (SWVE) method with ferric nitrate as the precursor. Fe/TNAs were characterized by SEM, XRD, XPS, and UV-vis DRS to investigate the surface properties and light absorption. As a result, the iron nanoparticles (NPs) were successfully deposited on the tubular structure of the TNAs, which showed the best light utilization. Moreover, the photoelectrochemical (PEC) properties of the Fe/TNAs were measured by current-light response and electrochemical impedance spectroscopy. The photocurrent of the Fe/TNAs-0.5 (3.5 mA/cm2) was higher than TNAs (2.0 mA/cm2) and electron lifetime of Fe/TNAs-0.5 (433.3 ms) were also longer than TNAs (290.3 ms). Compared to the photolytic (P), photocatalytic (PC), and electrochemical (EC) method, Fe/TNAs PEC showed the best removal efficiency for methyl orange degradation. Furthermore, the Fe/TNAs PEC system also performed better removal efficiency than that of photolysis method in E. coli degradation experiments.

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Section: Surface Morphology Of Tnas and Fe/tnasmentioning

confidence: 99%

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

et al. 2021

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“…If the oxygen bubble mold did not exist within the oxide film, plastic flow or lateral deformation toward the pore wall of the barrier oxide at the base could not appear. 2,26 Because of the rapid increase in the J e , the oxygen gas bubbles expand continuously and then destroy the ACL. If the ACL on the surface is partially destroyed by the upward gas flow, then the electrolyte and F − ions can flow into the bottom of the nanopores quickly, as shown in Figure 4(II).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Porous anodic oxides, especially porous anodic alumina (PAA) and anodic TiO 2 nanotubes (ATNTs), have been extensively investigated for many years due to their complicated formation mechanism − and their various applications (e.g., solar energy materials, magnetic semiconductors, supercapacitors). − To the best of our knowledge, while aluminum is anodized in sulfuric acid, oxalic acid, and phosphoric acid electrolyte, generally regular PAA can be obtained. , While titanium is anodized in NH 4 F electrolyte, ordered ATNTs can be fabricated. ,− However, few people research the anodizing process of aluminum in NH 4 F electrolyte. Despite the intensive investigation and much deeper interpretation, the driving force for the pore formation and formation mechanism of PAA and ATNTs are still controversial − because they can hardly be derived by direct in situ methods .…”

Section: Introductionmentioning

confidence: 99%

Anodizations of Al and Ti in NH₄F or H₃PO₄ Solutions and Formation of Porous Anodic Alumina with Special Morphology

Cui

et al. 2017

J. Phys. Chem. C

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Porous anodic alumina (PAA) and anodic TiO 2 nanotubes (ATNTs) have been widely investigated for decades. However, their formation mechanism and growth kinetics remain unclear. Here two unconventional and two conventional anodizations of aluminum and titanium are contrasted to overcome this challenge. PAA with special morphology was fabricated in NH 4 F electrolyte for the first time, which cannot be explained by the popular field-assisted theory. Combining the oxygen bubble mold and the oxide flow model with the dissolution model, a new explanation for the special morphology is presented. In addition, anodic titanium oxide films with plenty of cavities were obtained in H 3 PO 4 electrolyte, which absolutely differ from the general compact films. The cavities in anodic titanium oxide films also result from the oxygen bubbles within the oxide films. The anions in electrolyte (e.g., F − , OH − , PO 4 3− ) accumulate, and the anion-contaminated layer (ACL) forms due to the electric field. The ACL plays a decisive role in the generation of the electronic current (J e ) and the formation of oxygen bubble mold. Regular ATNTs were obtained as titanium was anodized in NH 4 F electrolyte. The ACL forms and appropriate J e generates because the dissolution from F − on TiO 2 is limited. However, PAA with special morphology was obtained as aluminum was anodized in NH 4 F electrolyte. Thicker ACL results in the impulse peak of the J e because the dissolution and corrosion from F − on alumina is severe.

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“…Anodic TiO 2 nanotube arrays (ATNAs) have attracted the interest of researchers for their wide applications such as photocatalysis, water splitting, and supercapacitors − owing to their high specific surface area. It is well known that the energy storage mechanism of TiO 2 nanotubes is mainly that of the electrical double-layer capacitor. , However, the capacitance of TiO 2 nanotubes is limited by their low conductivity and poor electrochemical activities .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Capacitance of TiO₂ Nanotubes with a Double-Layer Structure Fabricated in NH₄F/H₃PO₄ Mixed Electrolyte

Zhang

Zhu

et al. 2019

Langmuir

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TiO 2 is an attractive electrode material in fast charging/ discharging supercapacitors because of its high specific surface area. However, the low capacitance of TiO 2 nanotubes as-anodized in the classical electrolyte restricts their further application in supercapacitors. Here, we study the performances of larger-diameter nanotubes with a double-layer structure fabricated in an NH 4 F/phosphoric acid (H 3 PO 4 ) mixed electrolyte. Results show that the double-layer structure increased the specific surface area of nanotubes owing to the cavities between the double layers and the porous structure on walls. After soaking in H 3 PO 4 aqueous solution for 40 min, the nanotubes anodized in the mixed electrolyte containing 6 wt % H 3 PO 4 show a specific capacitance of 13.89 mF cm −2 , ∼3.11 times that of the pristine nanotubes in the classical electrolyte. The specific surface area of the soaked nanotubes is up to 113.2 m 2 g −1 , which is ∼2.94 times that of the pristine nanotubes. The values of specific surface area of the anodized nanotubes and the soaked nanotubes fabricated in the mixed electrolyte containing 6 wt % H 3 PO 4 are roughly equal. It demonstrated that the specific surface area increased mainly due to the double-layer structure. The double-layer structure reveals a new strategy to enhance the specific capacitance of TiO 2 nanotubes.

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Fast growth of self-aligned titania nanotube arrays with excellent transient photoelectric responses

Cited by 24 publications

References 53 publications

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

Anodizations of Al and Ti in NH₄F or H₃PO₄ Solutions and Formation of Porous Anodic Alumina with Special Morphology

Enhanced Capacitance of TiO₂ Nanotubes with a Double-Layer Structure Fabricated in NH₄F/H₃PO₄ Mixed Electrolyte

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Fast growth of self-aligned titania nanotube arrays with excellent transient photoelectric responses

Cited by 24 publications

References 53 publications

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

Iron Modified Titanate Nanotube Arrays for Photoelectrochemical Removal of E. coli

Anodizations of Al and Ti in NH4F or H3PO4 Solutions and Formation of Porous Anodic Alumina with Special Morphology

Enhanced Capacitance of TiO2 Nanotubes with a Double-Layer Structure Fabricated in NH4F/H3PO4 Mixed Electrolyte

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Product

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About

Anodizations of Al and Ti in NH₄F or H₃PO₄ Solutions and Formation of Porous Anodic Alumina with Special Morphology

Enhanced Capacitance of TiO₂ Nanotubes with a Double-Layer Structure Fabricated in NH₄F/H₃PO₄ Mixed Electrolyte