scholarly journals Fabrication of TiO2 Nanotube by Electrochemical Anodization: Toward Photocatalytic Application

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
O. Zakir ◽  
R. Idouhli ◽  
M. Elyaagoubi ◽  
M. Khadiri ◽  
A. Aityoub ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Pure Titanium ◽  
Size Control ◽  
Ammonium Fluoride ◽  
Electrode System ◽  
Electrochemical Anodization ◽  
Voltage Range ◽  
X Ray ◽  
Self Organized ◽  
Type Semiconductor

In this study, a self-organized nanotubular titanium dioxide (TiO2) array was successfully produced by anodizing pure titanium in a mixture of glycerol, distilled water (8% vol.), and ammonium fluoride using a dual electrode system. The size control and distribution of the nanopores were performed in a DC voltage range varying from 30 V to 60 V. The diameter of TiO2 nanopores varies from 59 to 128 nm depending on the anodizing voltage. Energy-dispersive X-ray spectroscopy (EDX) analysis reveals that the as-prepared films are essentially composed of TiO2. According to the X-ray diffraction (XRD) and Raman spectroscopy analysis, the nanotubular arrays of TiO2 annealed at 600°C for 2 hours are composed of a phase mixture of anatase and rutile. Mott-Schottky analysis showed that the TiO2 nanotubes are consistent with an n-type semiconductor with a donor density of about 1017 cm-3. Preliminary results on the photocatalytic degradation of a pharmaceutical pollutant showed that the TiO2 nanotubes can be used as a promising material for application in wastewater treatment.

scholarly journals Highly Ordered TiO2 Nanotube Arrays with Engineered Electrochemical Energy Storage Performances

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 510
Author(s):  
Wangzhu Cao ◽  
Kunfeng Chen ◽  
Dongfeng Xue
Keyword(s):  
Tio2 Nanotubes ◽  
Lithium Ion ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Free Standing ◽  
Structured Materials ◽  
Self Organized ◽  
Binder Free

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

The Effect of Preparation Temperature of Electrolytes on Undoped and Ag-Doped TiO2 Nanotube Structures

2016 ◽  
Vol 860 ◽  
pp. 7-11 ◽  
Author(s):  
Somkuan Photharin ◽  
Buagun Samran ◽  
Rinnatha Vongwatthaporn ◽  
Narongsak Kodtharin ◽  
Ramida Chaiyarat ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrolyte Solution ◽  
Pure Titanium ◽  
Silver Ions ◽  
Ammonium Fluoride ◽  
Electrolyte Solutions ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Preparation Temperature ◽  
X Ray

In this work, we present the effect of preparation temperature of electrolytes for fabricating undoped and silver (Ag) doped titanium dioxide (TiO2) nanotubes by the electrochemical anodic oxidation of pure titanium sheets in electrolytes, mixtures of ethylene glycol (EG), ammonium fluoride (NH4F) and deionized water, that contain with different of silver ions. Heat treatment of electrolytes was carried out at 100 °C during preparation process. The morphology and structure of prepared nanotubes were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The structures of TiO2 nanotubes obtained from heat treatment and non-heat treatment of electrolyte solutions and adding silver ions in electrolyte solution are similar. The nanotubes appear in arrays and the diameters of nanotubes were about 92 nm for non-heat treatment electrolyte solution and undoped TiO2 and about 102 nm for heat treatment electrolyte solution and all Ag-doped TiO2 nanotube arrays. When the concentration of silver nitrate (AgNO3) increases, the TiO2 nanotube arrays cracked and are not well arranged.

scholarly journals All-Solid-State Lithium Ion Batteries Using Self-Organized TiO2 Nanotubes Grown from Ti-6Al-4V Alloy

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2121
Author(s):  
Vinsensia Ade Sugiawati ◽  
Florence Vacandio ◽  
Thierry Djenizian
Keyword(s):  
Cyclic Voltammetry ◽  
Solid State ◽  
Tio2 Nanotubes ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Electrochemical Anodization ◽  
Self Organized ◽  
Solid State Batteries ◽  
One Step ◽  
Tio2 Nts

All-solid-state batteries were fabricated by assembling a layer of self-organized TiO2 nanotubes grown on as anode, a thin-film of polymer as an electrolyte and separator, and a layer of composite LiFePO4 as a cathode. The synthesis of self-organized TiO2 NTs from Ti-6Al-4V alloy was carried out via one-step electrochemical anodization in a fluoride ethylene glycol containing electrolytes. The electrodeposition of the polymer electrolyte onto anatase TiO2 NTs was performed by cyclic voltammetry. The anodized Ti-6Al-4V alloys were characterized by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the anodized Ti-6Al-4V alloys were investigated by cyclic voltammetry and chronopotentiometry techniques. The full-cell shows a high first-cycle Coulombic efficiency of 96.8% with a capacity retention of 97.4% after 50 cycles and delivers a stable discharge capacity of 63 μAh cm−2 μm−1 (119 mAh g−1) at a kinetic rate of C/10.

Optical and Electrical Properties of TiO2 Nanotubes Grown by Titanium Anodization

2009 ◽  
Vol 1178 ◽  
Author(s):  
Yahya Alivov ◽  
Vladimir Kuryatkov ◽  
Mahesh Pandikunta ◽  
Gautam Rajanna ◽  
Daniel Johnstone ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electrical Properties ◽  
Tio2 Nanotubes ◽  
Anatase Phase ◽  
Rutile Phase ◽  
Electrochemical Anodization ◽  
Voltage Range ◽  
Wide Range ◽  
Transient Spectroscopy ◽  
Tio2 Nts

AbstractIn this work we investigated the structural, electrical, and optical properties of titanium dioxide (TiO2) nanotubes (NTs) formed by electrochemical anodization of Ti metal sheets in NH4F+glycerol electrolyte at different anodization voltages (Va) and acid concentrations. Our results revealed that TiO2 NTs can be grown in a wide range of anodization voltages from 10 V to 240 V. The maximum NH4F acid concentration, at which NTs can be formed, decreases with the anodization voltage, which is 0.7% for Va<60V, and decreases to 0.1% at Va =240 V. Glancing angle X-ray diffraction (GAXRD) experiments show that as-grown amorphous TiO2 transforms to anatase phase after annealing at 400 oC, and further transforms to rutile phase at annealing temperatures above 500 oC. Samples grown in 30-120 voltage range have higher crystal quality as seen from anatase (101) peak intensity and reduced linewidth. The electrical resistivity of the NTs varies with Va concentration and increases by eight orders of magnitude when Va increases from 10 V to 240 V. This is consistent with cathodoluminescense studies which showed improved optical properties for samples grown in this voltage range. Optical properties of samples were also studied by low temperature photoluminescence. Temperature dependent I-V and photo-induced current transient spectroscopy were employed to analyze electrical properties and defect structure on NT samples.

scholarly journals Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2714
Author(s):  
Mario Bohač ◽  
Tihana Čižmar ◽  
Vedran Kojić ◽  
Jan Marčec ◽  
Krunoslav Juraić ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Low Cost ◽  
Electrochemical Anodization ◽  
Oh Radicals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Titanium Thin Films ◽  
Current Densities ◽  
Photogenerated Charge Separation

A novel low-cost synthesis of barium-modified TiO2 nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH)2 spin coated on top of TNT. Three different concentrations of Ba(OH)2 were used (12.5 mM, 25 mM and 50 mM). The crystalline structure, morphology and presence of Ba were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Ba-modified TiO2 nanotubes (BTNT) were tested for photocatalytic degradation of diclofenac under UV/Vis radiation and it was proven that all of the Ba-modified samples showed an increase in photocatalytic activity with respect to the unmodified TNTs. The most efficient photocatalyst was the sample prepared with 25 mM Ba(OH)2 which showed 90% diclofenac degradation after 60 min. This result was in agreement with cyclic voltammetry measurements that showed the largest increase in photo-oxidation current densities for the same sample due to the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation.

scholarly journals Photocatalytic deposition of silver particles on titania nanotube thin films: Influence of precursor concentration

2020 ◽  
Vol 3 (2) ◽  
pp. 11
Author(s):  
Ying Pei Lim ◽  
Devagi Kanakaraju ◽  
Ying Chin Lim
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Precursor Solution ◽  
Ammonium Fluoride ◽  
Electrode System ◽  
Titania Nanotubes ◽  
Silver Particles ◽  
Photoelectrochemical Performance ◽  
Photochemical Reduction ◽  
X Ray

Titania nanotubes (TiNT) has gained much interest as it has high surface area and fewer grain boundaries. In order to enhance the photoelectrochemical properties of TiNT, modification has been carried out to dope silver on TiNT. In this study, a combination of electrochemical anodisation and a photochemical reduction was employed to fabricate silver supported on titania nanotubes (AgTiNT). TiNT was synthesized via anodisation of titanium plate in a two-electrode system containing ethylene glycol and ammonium fluoride. Then, the silver particles were deposited on TiNT by immersion in various concentrations of silver precursor solution followed by ultraviolet light radiation. The prepared samples were characterized using field emission scanning electron microscopy (FESEM) for morphology, x-ray diffractometry (XRD) for crystal structure and energy dispersive x-ray (EDX) to determine the element content. TiNT demonstrated a well-ordered structure, but the nanotubes tend to clump together upon deposition of Ag. The effect of Ag deposition on the photoelectrochemical performance of TiNT was studied where almost one-fold enhancement in the photoelectrochemical property was observed for AgTiNT compared to pure TiNT.

scholarly journals Photoelectrochemical properties of N-doped self-organized titania nanotube layers with different thicknesses

2006 ◽  
Vol 21 (11) ◽  
pp. 2824-2828 ◽  
Author(s):  
J.M. Macak ◽  
A. Ghicov ◽  
R. Hahn ◽  
H. Tsuchiya ◽  
P. Schmuki
Keyword(s):  
Photoelectron Spectroscopy ◽  
Nitrogen Doping ◽  
Electrochemical Anodization ◽  
Tube Length ◽  
Ammonia Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Organized ◽  
Structure Morphology ◽  
N Doping

The present work reports nitrogen doping of self-organized TiO2 nanotubular layers. Different thicknesses of the nanotubular layer architecture were formed by electrochemical anodization of Ti in different fluoride-containing electrolytes; tube lengths were 500 nm, 2.5 μm, and 6.1 μm. As-formed nanotube layers were annealed to an anatase structure and treated in ammonia environment at 550 °C to achieve nitrogen doping. The crystal structure, morphology, composition and photoresponse of the N-doped were characterized by scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and photoelectrochemical measurements. Results clearly show that successful N-doping of the TiO2 nanotubular layers can be achieved upon ammonia treatment. The magnitude of the photoresponse in ultraviolet and visible light is strongly dependent on the thicknesses of the layers. This effect is ascribed to recombination effects along the tube length.

Effect of Fluoride Concentration and Water Content on Morphology of Titania Nanotubes in Ethylene Glycol Solution

2013 ◽  
Vol 829 ◽  
pp. 907-911 ◽  
Author(s):  
Meysam Naghizadeh ◽  
Saber Ghannadi ◽  
Hossein Abdizadeh ◽  
Mohammad Reza Golobostanfard
Keyword(s):  
Ethylene Glycol ◽  
Water Content ◽  
Fluoride Concentration ◽  
Pure Titanium ◽  
Ammonium Fluoride ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Geometrical Parameters ◽  
High Concentration ◽  
Inner Diameter

Titanium dioxide (TiO2) nanotube arrays were prepared at room temperature by electrochemical anodization of a pure titanium foil in electrolyte solutions containing ethylene glycol as a solvent and de-ionized water and ammonium fluoride as additives. Since the morphology and size of TiO2 nanotubes play critical roles in determining their performance, the control of geometrical parameters of the nanotube arrays including length and inner diameter are of great importance. The present research demonstrates the significant effects of fluoride concentration and water content in anodizing electrolyte on formation of nanotubes and their dimensions. Scanning electron microscope investigation shows that nanotube arrays are no longer formed in very low or very high concentration of ammonium fluoride. Also, increase in fluoride concentration causes increase in lengths and inner diameters of the nanotubes. Moreover, it is evident that the maximum nanotube growth rate was achieved in medium amount of water. In addition, it is found that the nanotube inner diameter increases by adding more water to the solution.

scholarly journals Synthesis and Photoelectrochemical Activity of TiO2 Nanotube Based Free Standing Membrane

2020 ◽  
Vol 32 (11) ◽  
pp. 2739-2742
Author(s):  
Misriyani ◽  
E.S. Kunarti
Keyword(s):  
Tio2 Nanotubes ◽  
Ammonium Fluoride ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Free Standing ◽  
Photoelectrochemical Activity ◽  
Fluoride Solution ◽  
X Ray ◽  
Anodization Method ◽  
Scanning Electron

TiO2 nanotubes (TNTs) were synthesized and modified using the anodization method in a glycerol and ammonium fluoride solution, which was followed by a thermal treatment. The second anodisation was continued by increasing anodizing voltage to deposit a film on the surface of titanium, which resulted in a free standing membrane based on of TNTs. The nanotubes were further characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The SEM result showed that the layer thickness of free standing membrane based on TNTs increased with an increase in the anodizing voltage; however, at high voltages, this layer was damaged. The XRD and FTIR results indicated the generation of TNT having an anatase crystal phase. The results of test for photoelectrochemical properties showed that the optimal conditions of anodizing voltage was 50 V maintained for 1 h.

Surface and Structural Properties of TiO2 Nanotubes Formation via Electrochemical Anodization

2013 ◽  
Vol 686 ◽  
pp. 71-76
Author(s):  
Nur Aimi Jani ◽  
Mohd Faizal Achoi ◽  
Mohd Muzamir Mahat ◽  
Saifollah Abdullah ◽  
Zainovia Lockman ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Low Cost ◽  
Average Diameter ◽  
Electrochemical Anodization ◽  
Electrochemical System ◽  
Time Analysis ◽  
Cross Sectional ◽  
Self Organized ◽  
Current Flows ◽  
Tio2 Nts

An electrochemical anodization is a simple and low cost technique, to electrochemically synthesize self-organized titanium dioxide (TiO2) nanotubes (NTs) from 1M Na2SO4 electrolyte with anodization of Ti foil. The FESEM results showed that the average diameter size and length of TiO2 NTs was found between 50 to 60 nm and 2.5 μm, respectively. The surface morphology of arrays TiO2 NTs is uniformly deposited on Ti substrate. While, the cross-sectional of TiO2 NTs revealed that, the TiO2 NTs is arrays alignment and close each other deposited. From current-anodisation time analysis (I-t) indicates that TiO2 nanotubes were start formed at anodisation time 429.03 sec with current flows is 51.69 mA in electrochemical system.

Sign in / Sign up

Export Citation Format

Share Document