Preparation and Capacitance Properties of Titania Nanotube Arrays

2010 ◽  
Vol 148-149 ◽  
pp. 912-915
Author(s):  
Yi Bing Xie
Keyword(s):  
Pore Size ◽  
Specific Capacitance ◽  
Small Degree ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Titania Nanotube Arrays ◽  
Double Layer Capacitor ◽  
Capacitance Performance ◽  
Titania Nanotube

The well-defined titania nanotube arrays with a tunable pore size and tube length have been fabricated in an organic medium-assisted anodization process. The obtained titania nanotubes have been applied for electric double layer capacitor applications. The electrochemical capacitance performance is highly dependent on the pore size and tube length of nanotube arrays. The increase of pore size can significantly enhance specific capacitance of titania nanotube arrays. Comparatively, the increase of tube length can only improve specific capacitance to a small degree. In addition, a higher specific capacitance of titania nanotube array can be achieved in an acidic solution rather than an alkali solution.

Photoelectrochemical Properties of Highly-ordered Titania Nanotube-arrays

2004 ◽  
Vol 837 ◽  
Author(s):  
Maggie Paulose ◽  
Oomman K. Varghese ◽  
Karthik Shankar ◽  
Gopal K. Mor ◽  
Craig A. Grimes
Keyword(s):  
Charge Separation ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Precise Control ◽  
Array Architecture ◽  
Titania Nanotube Arrays ◽  
Anodization Process ◽  
Titania Nanotube ◽  
20 Nm ◽  
Water Photoelectrolysis

ABSTRACTWe report on non-particulate titania photoelectrodes with a unique highly-ordered nanotube-array architecture prepared by an anodization process that enables precise control over array dimensions. Under 320–400 nm illumination titania nanotube-array photoanodes, pore size 110 nm, wall thickness 20 nm, and 6 μm length, generate hydrogen by water photoelectrolysis at a normalized rate of 80 mL/W•hr, to date the most efficient titania-based photoelectrochemical device, with a conversion efficiency of 12.25%. The highly-ordered nanotubular architecture allows for superior charge separation and charge transport, with a calculated quantum efficiency of nearly 100% for incident photons with energies larger than the titania bandgap.

Supercapacitor electrodes based on modified titania nanotube arrays on flexible substrates

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kunnambeth M. Thulasi ◽  
Sindhu Thalappan Manikkoth ◽  
Anjali Paravannoor ◽  
Shajesh Palantavida ◽  
Baiju Kizhakkekilikoodayil Vijayan
Keyword(s):  
Metal Oxides ◽  
Electrochemical Impedance ◽  
Titanium Foil ◽  
Nanotube Arrays ◽  
Metal Foil ◽  
X Ray Diffraction ◽  
Nanotube Array ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Supercapacitor Performance

Abstract Highly ordered titania nanotube arrays were synthesised on titanium metal foil through electrochemical anodisation. The annealed samples were characterised through scanning electron microscopy and X-ray diffraction analysis. The electrochemical characterisations of the arrays were done through cyclic voltammetry, galvanostatic charge discharge and electrochemical impedance spectroscopy analyses. The titania nanotube arrays exhibited a specific capacitance of 6.8 mF cm–2 at 5 mV s–1 scan rate, which is very much higher than that reported earlier. Pseudocapacitive metal oxides were deposited on these arrays forming composite supercapacitor electrodes and their supercapacitor properties were compared with same deposited on bare titanium foil substrates. Pseudocapacitive metal oxides deposited on these titania nanotube array substrates exhibited improved supercapacitor performance and stability over the same deposited on titanium foil substrates.

scholarly journals Photocatalytic Properties of Size-Controlled Titania Nanotube Arrays

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Takeshi Hashishin ◽  
Keisuke Misawa ◽  
Kazuo Kojima ◽  
Chihiro Yogi ◽  
Jun Tamaki
Keyword(s):  
Crystallite Size ◽  
Rate Constant ◽  
Apparent Rate Constant ◽  
Anatase Phase ◽  
Ultra Violet ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Inner Diameter

The titania nanotube arrays (TNAs) with smooth surface was synthesized by anodization of titanium foil with 3 cm2in square area using the electrolyte composed of 0.2 wt% NH4F and 0.5 vol% H2SO4in ethylene glycol in order to evaluate the methylene blue photodegradation under ultra-violet irradiation. The tube length and inner diameter as a size parameter were controlled by the anodization time from 5 to 10 h and applied voltage from 10 to 50 V. The titania nanotube arrays (TNAs) annealed at 300 to 500°C were assigned to anatase phase, and TNAs at 600°C had both phase of anatase and rutile. The crystallite size and the apparent rate constant were increased with the increase in the annealing temperature of TNAs from 300 to 500°C. The bigger crystallite size of TNAs is suggested to be related to the increase in the amount of hole at the valence band, leading to the decrease in the apparent rate constant of MB degradation. Interestingly, the four kinds of linear relationship with the apparent rate constant were seen in both the inner diameter of TNAs and the length. Consequently, the apparent rate constant strongly depended on inner diameter of TNAs.

Gold Nanoparticles Modified Titania Nanotube Arrays for Amperometric Determination of Ascorbic Acid

2010 ◽  
Vol 43 (18) ◽  
pp. 2809-2822 ◽  
Author(s):  
T. G. Satheesh Babu ◽  
P. V. Suneesh ◽  
T. Ramachandran ◽  
Bipin Nair
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Nanotube Arrays ◽  
Amperometric Determination ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube

Effects of Synthesis Parameters on Controllable Growth of Highly-Ordered TiO2 Nanotube Arrays

2011 ◽  
Vol 284-286 ◽  
pp. 791-795 ◽  
Author(s):  
Shi Pu Li ◽  
Shi Wei Lin ◽  
Jian Jun Liao ◽  
Dan Hong Li ◽  
Yang Cao ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Nanotube Arrays ◽  
Mixed Electrolyte ◽  
Preparation Conditions ◽  
Photoelectrical Properties ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Controllable Growth ◽  
Polishing Fluid ◽  
Abrasive Paper

Titania nanotube arrays were fabricated in deionize water and glycerol mixed electrolyte containing a certain amount of NH4F. Three different polishing methods were used for pretreatment of Ti substrates: polished by hand with abrasive paper, by polishing machine, or by chemical polishing fluid (HF:HNO3=1:4, in volumetric ratio). The morphology of three different samples were imaged by scanning electron microscopy, and their photoelectrical properties were studied as well. Experimental results showed that Titania nanotube arrays grown on the Ti substrate and polished by polishing fluid has highly-ordered and well-defined nanotube structure. The effects of anodization potential and duration on synthesis of highly-ordered TiO2nanotubes were also studied in this paper. Both the layer thickness and nanotube diameter linearly increase with the increasing potential. The layer thickness also increases with prolongation of anodization time. By optimizing the preparation conditions, we can successfully control the geometrical structure of TiO2nanotube arrays with diameters in the range between 50 and 200 nm and the layer thickness between 800 and 2000 nm.

Sign in / Sign up

Export Citation Format

Share Document