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.

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.

Electrochemical Fabrication and Characterization of Highly-Ordered Titania Nanotube Arrays

2010 ◽  
Vol 148-149 ◽  
pp. 1600-1606
Author(s):  
Hai Tao Zhang ◽  
Xiang Yun Deng ◽  
Xin Zheng Wu ◽  
Ri Ke Chen
Keyword(s):  
Ph Value ◽  
Anatase Phase ◽  
Nanotube Arrays ◽  
Cyclic Voltammogram ◽  
X Ray Diffraction ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Anodic Voltage ◽  
Electrochemical Fabrication

Highly-ordered titania nanotube arrays were fabricated in ethylene glycol polar organic electrolyte containing a certain amount of sodium fluoride. Series of patterned nanotube arrays with different outside diameter and aspect ratio were obtained via optimizing anodic voltage, the concentration of fluoride ion and reaction time. The as-prepared nanotube arrays were amorphous and transformed single anatase phase characterized by X-ray diffraction with annealing under the condition of 450oC for 3h. Cyclic voltammogram behaviors were discussed using electrochemical workstation. The pH value of electrolyte, the scanning rate, the crystal structure and morphology of the samples have a significant effect on the reductive/oxidative and H+ intercalation properties.

Fabrication and Mechanism of Titania Nanotube Arrays by Anodization in DMSO Electrolyte

2010 ◽  
Vol 148-149 ◽  
pp. 873-876
Author(s):  
Jian Ling Zhao ◽  
Ying Ru Kang ◽  
Xi Xin Wang ◽  
Cheng Chun Tang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dimethyl Sulfoxide ◽  
Titanium Foil ◽  
Nanotube Arrays ◽  
Dmso Solution ◽  
Anodization Time ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Scanning Electron

Titania nanotube arrays were synthesized via anodic oxidization of titanium foil in dimethyl sulfoxide (DMSO) solution containing 2 wt% HF and 3 wt% H2O at 40 V. The microstructure of the arrays was characterized with scanning electron microscopy (SEM). The results show that morphology of titania nanotube arrays is evidently influenced by the anodization time, and with the extension of oxidation time, the better morphology could be obtained. The possible formation mechanism of titania nanotube arrays has been discussed.

Fabrication and EIS Characterization of Titania Nanotube Arrays with Top Non-Tube Layer

2011 ◽  
Vol 689 ◽  
pp. 350-354 ◽  
Author(s):  
Xiang Li Li ◽  
Chun Hua Xu ◽  
Zhi Lei Wen ◽  
Wen Jie Zhang
Keyword(s):  
Electrochemical Impedance ◽  
Amorphous Structure ◽  
Charge Transfer Resistance ◽  
Electrochemical Process ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
Transfer Resistance ◽  
Titania Nanotube Arrays ◽  
Electrochemical Parameters

TiO2nanotube arrays were fabricated in the electrolyte containing 0.25wt% NH4F, 2.5vol% water and the ethylene glycol for various hours at room temperature by anodization of Ti foil in this paper. Some anodized specimens were annealed at 450°C for 3 hours. Electrochemical Impedance Spectroscopy (EIS) was employed to measure electrochemical parameters of anodized specimens. The morphology and crystalline structure of anodized products were characterized by Field Emission Scanning Electronic Microscopy (FESEM), X-ray Diffraction (XRD) and Transmission Electronic Microscopy (TEM). A non-tube layer appears on nanotube arrays with the increase in anodization time. Anodized TiO2nanotube arrays have an amorphous structure, which transfers to anatase structure after annealing at 450°C. A new equivalent circuit R(CR(R(QR)(CR))) was proposed to fit EIS data. The results show that the charge transfer resistance at the electrode/electrolyte interface controls the electrochemical process of TiO2nanotubes.

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.

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
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