Synthesis and Photoelectrochemical Properties of Self-Organized Anodic TiO2 Nanotube Arrays

2011 ◽  
Vol 219-220 ◽  
pp. 1329-1332
Author(s):  
Shi Kai Liu ◽  
Wei Cui ◽  
Hai Bin Yang ◽  
Zheng Xin Li ◽  
Wen Jun Zou
Keyword(s):  
Surface Morphology ◽  
Aqueous Electrolyte ◽  
Tube Diameter ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Amorphous Films ◽  
Self Organized ◽  
Different Temperatures ◽  
Crystalline Nature

Self-organized nanotube arrays were prepared by a facile two-electrode electrochemical anodization on pure Ti in a 0.5wt% NH4F aqueous electrolyte. The surface morphology, structure, optical and photoelectrochemical behaviors of the nanotubular films were considered. The as-formed nanotubes are highly ordered with ~700nm in length and the average tube diameter is about 90nm. By annealing the initially amorphous films at different temperatures, the importance of the crystalline nature is confirmed. The photoelectrochemical properties are investigated and the highest photocurrent of 2.297 mA/cm2 is obtained under AM1.5 100 mW/cm2 illumination at 0.6 V (vs Ag/AgCl).

Fabrication and Photoelectrochemical Properties of Self-Organized Mixed Oxide Nanotubes by Anodization of Ti-2Al-1.5Mn Alloy

2011 ◽  
Vol 219-220 ◽  
pp. 1333-1336 ◽  
Author(s):  
Shi Kai Liu ◽  
Yan Tao Li ◽  
Hai Bin Yang ◽  
Wen Jun Zou ◽  
Zheng Xin Li
Keyword(s):  
Mixed Oxide ◽  
Visible Region ◽  
Ammonium Fluoride ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Self Organized ◽  
Photoelectrochemical Response ◽  
Ion Doping ◽  
Application Prospects

Nanotubular films on the surface of Ti-2Al-1.5Mn (TC1) alloy were fabricated by electrochemical anodization technique in aqueous ammonium fluoride solutions at 20V for 3h. The photoelectrochemical activities of the nanotube arrays were investigated, as well as their phase, structure, composition and photoabsorption properties. The photo-absorption in the visible region and the photoelectrochemical response were improved obviously. It is attributed to the Mn ion doping of TiO2 lattices. Furthermore, the resulted nanotube arrays are expected to have bright application prospects for solar utilization.

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.

Colloidal CuInS2 Based Nanocrystals /TiO2 Nanotube Arrays Composite Solar Cells Fabrication and Testing

2012 ◽  
Vol 1409 ◽  
Author(s):  
Vanga R. Reddy ◽  
William Wilson ◽  
Rick Eyi ◽  
Jiang Wu ◽  
M. O. Manasreh ◽  
...  
Keyword(s):  
Solar Cells ◽  
Low Cost ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Properties And Characterization ◽  
Self Organized ◽  
Current Voltage ◽  
Junction Type ◽  
Photovoltaic Technologies ◽  
First Time

ABSTRACTTo develop alternative and low cost photovoltaic technologies we have synthesized CuInS2 nanocrystals with tunable optical properties and characterization was carried out thoroughly with TEM, SEM, EDAX and XRD. Furthermore large self-organized arrays of TiO2 nanotubes were fabricated on Ti foil followed by simple electrochemical anodization technique and characterized their structure by SEM and then for the first time coupled both the nanocrystals and nanotubes to form a p-n junction type photovoltaic device. The current-voltage (I-V) characteristics of photovoltaic cells were measured to test the proof of concept. Some preliminary experiments showed that device generates some current upon illumination. However, in our case we fabricated a device without sandwiching any buffer or barrier layers in between nanocrystals and nanotube arrays. We have been optimizing our solar cells efficiency by improving quality of nanotubes and nanocrystals. Some of the interesting finding are presented and discussed.

scholarly journals Photoelectrochemical Performance of Smooth TiO2Nanotube Arrays: Effect of Anodization Temperature and Cleaning Methods

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Chin Wei Lai ◽  
Srimala Sreekantan
Keyword(s):  
Wall Thickness ◽  
High Efficiency ◽  
Charge Transfer Resistance ◽  
Nanotube Arrays ◽  
Photoelectrochemical Performance ◽  
Transfer Resistance ◽  
Self Organized ◽  
Different Temperatures ◽  
Cleaning Methods ◽  
Low Charge

The formation of self-organized titanium dioxide (TiO2) nanotube arrays without bundling or clustering is essential for their high efficiency in photoelectrochemical (PEC) application. The present paper reports on the use of different temperatures to control the specific architecture of nanotube arrays and effective cleaning techniques to ensure the formation of clean TiO2nanotube surface. The wall thickness of nanotube arrays could be controlled from 12.5 nm to 37.5 nm through different anodization temperature ranging from 10°C to 80°C. Furthermore, ultrasonic cleaning combined with acetone showed the high-ordered TiO2nanotube arrays without morphological disorder, bundling, and microcrack problems. Based on the results obtained, a higher PEC response of 1 mA/cm2and a photoconversion efficiency of 1.3% could be achieved using a wall thickness of 12.5 nm and defect-free TiO2nanotube arrays for low charge transfer resistance.

Porous Barium Strontium Titanate-Titania Nanocomposites for Photocatalytic Applications

2008 ◽  
Vol 47-50 ◽  
pp. 936-939
Author(s):  
Guo Ge Zhang ◽  
Hai Tao Huang ◽  
Helen Lai Wah Chan ◽  
Li Min Zhou
Keyword(s):  
Surface Morphology ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Photocatalytic Property ◽  
Electrochemical Anodization ◽  
Molar Ratios ◽  
Self Organized ◽  
Barium Strontium ◽  
Titania Nanotube Arrays ◽  
Strontium Hydroxide

Porous barium strontium titanate−titania (BST−TiO2) nanocomposite was developed by the combination of electrochemical anodization and hydrothermal synthesis. Self organized titania nanotube arrays were first fabricated by electrochemical anodization of titanium foil in 0.2 wt.% HF. The as-anodized titania was then used as a template and was subject to a hydrothermal treatment in the solution mixture of barium hydroxide and strontium hydroxide with different molar ratios. Well crystallized barium strontium titanate was developed directly from the titania nanotubes. Annealing was carried out to transform residual amorphous titania to crystallized anatase, resulting in the porous BST−TiO2 nanocomposite. The surface morphology and structure of the nanocomposite were characterized. The photoelectrochemical response of the BST−TiO2 composite was investigated and the photocatalytic property was evaluated through the photo-decomposition of an organic dye solution. The effect of hydrothermal parameters on the surface morphology and the photocatalytic activity of the nanocomposite was studied.

Analysis of Photocurrent Responses of Anodized TiO2 Nanotubes Synthesized from Different Organic Electrolytes

2015 ◽  
Vol 1109 ◽  
pp. 429-433
Author(s):  
Syazwan Hanani Meriam Suhaimy ◽  
Chin Wei Lai ◽  
Sharifah Bee Abd Hamid ◽  
Mohd Rafie Johan ◽  
M.R. Hasan
Keyword(s):  
Titanium Dioxide ◽  
Surface Morphology ◽  
Ethylene Glycol ◽  
Anodic Oxidation ◽  
Electrochemical Anodization ◽  
Photocurrent Response ◽  
Sem Images ◽  
Organic Electrolytes ◽  
Self Organized ◽  
Sem Analyses

Self-organized titanium dioxide (TiO2) nanotubes (NTs) arrays were successfully fabricated via electrochemical anodization of titanium (Ti) foil in an organic electrolyte containing 5wt% of fluoride content. The present work compares two different organic electrolytes (glycerol and ethylene glycol) for the growth of self-organized TiO2 nanotubes by using anodic oxidation strategy. The resultant TiO2 NTs were then subjected to thermal annealing for manipulating the crystalline structure. The SEM images indicated changes in surface morphology of the TiO2 NTs in different electrolytes. It was found that the NT’s dimensional was 56.00nm based on the SEM analyses. Both samples exhibited good photocurrent response; however, TiO2 NTs synthesized in ethylene glycol electrolyte showed promising photocurrent response of 0.385 mA.

Preparation and Photoelectrochemical Properties of TiO2 Nanotube Arrays Modified with Nano-Scaled CdSe

2013 ◽  
Vol 320 ◽  
pp. 138-142
Author(s):  
Jia Qin Liu ◽  
Yan Wang ◽  
Guang Qing Xu ◽  
Hong Mei Zheng ◽  
Rong Jun Pan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Deposition Process ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
Solution Deposition ◽  
Photo Response ◽  
Uniform Diameter ◽  
Scanning Electron ◽  
Sustained Increase

Highly ordered TiO2 nanotube arrays (TNTAs) with smooth walls and uniform diameter were prepared by electrochemical anodization. And then solution deposition process was adopted for the modification of the TNTAs with nanoscaled CdSe. The materials obtained were characterized by field emission scanning electron microscopy, UVvisible spectroscopic and photoelectrochemical techniques. The results revealed that the morphologies and growth mechanism for CdSe/TNTAs composites varied with the reaction time in Se2- solutions (c=1.2 mol/L) when nanotubes were firstly imported with Cd2+ ions. Optical absorption behavior of the CdSe/TNTAs composites increased with more CdSe nanoparticles. And the photo-response of the obtained nanomaterials was first strengthened and then declined with the sustained increase of the deposited CdSe.

Synthesis of TiO2 Nanotube Arrays Through Multistep Anodization

2008 ◽  
Vol 368-372 ◽  
pp. 526-528
Author(s):  
Yang Yang ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Pore Diameter ◽  
Aqueous Electrolyte ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Organic Electrolyte ◽  
Electrochemical Anodization ◽  
Current Work ◽  
Nanotube Arrays ◽  
Sem Images

Multistep electrochemical anodization is an electrochemical experiment orderly conducting in different electrolytes. In this paper, TiO2 nanotube arrays have been firstly anodic grown in aqueous electrolyte (H3PO4/HF) and later anodic grown in organic electrolyte (glycerol/NH4F). Compared with separately anodizing in aqueous and organic electrolyte, the morphology of the resulting nanotube arrays can be optimized. SEM images showed that the obtained nanotubes have a length of more than 2 μm and single-pore diameter ranging from 120 to 150 nm. The current work indicates that the multistep electrochemical anodization has a contribution to the optimization of the morphology of TiO2 nanotube arrays.

Synthesis and Characterization of Self-Organized Oxide Nanotube Arrays via a Facile Electrochemical Anodization

2008 ◽  
Vol 112 (50) ◽  
pp. 19852-19859 ◽  
Author(s):  
Shikai Liu ◽  
Wuyou Fu ◽  
Haibin Yang ◽  
Minghui Li ◽  
Peng Sun ◽  
...  
Keyword(s):  
Electrochemical Anodization ◽  
Synthesis And Characterization ◽  
Nanotube Arrays ◽  
Self Organized
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