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Open AccessArticle

Fabrication of TiO2-Nanotube-Array-Based Supercapacitors

1
Department of Physics, College of Science, King Faisal University, P.O. Box-400, Al-Ahsa 31982, Saudi Arabia
2
Helmholtz Institute Ulm, Electrochemical Energy Storage, 89081 Ulm, Germany
3
National Nanotechnology Center, King Abdulaziz City for Science and Technology, P.O Box 6086, Riyadh 11442, Saudi Arabia
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School of Materials Science & Engineering, Changwon National University, Changwon 51140, Korea
*
Authors to whom correspondence should be addressed.
Micromachines 2019, 10(11), 742; https://doi.org/10.3390/mi10110742
Received: 18 September 2019 / Revised: 10 October 2019 / Accepted: 26 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue NANO KOREA 2019)
In this work, a simple and cost-effective electrochemical anodization technique was adopted to rapidly grow TiO2 nanotube arrays on a Ti current collector and to utilize the synthesized materials as potential electrodes for supercapacitors. To accelerate the growth of the TiO2 nanotube arrays, lactic acid was used as an electrolyte additive. The as-prepared TiO2 nanotube arrays with a high aspect ratio were strongly adhered to the Ti substrate. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results confirmed that the TiO2 nanotube arrays were crystallized in the anatase phase. TEM images confirmed the nanotublar-like morphology of the TiO2 nanotubes, which had a tube length and a diameter of ~16 and ~80 nm, respectively. The electrochemical performance of the TiO2 nanotube array electrodes was evaluated using the cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD) measurements. Excellent electrochemical response was observed for the electrodes based on the TiO2 nanotube arrays, as the cells delivered a high specific capacitance of 5.12 mF/cm2 at a scan rate of 100 mV/s and a current density of 100 µA/cm2. The initial capacity was maintained for more than 250 cycles. Further, a remarkable rate capability response was observed, as the cell retained 88% of the initial areal capacitance when the scan rate was increased from 10 to 500 mV/s. The results suggest the suitability of TiO2 nanotube arrays as electrode materials for commercial supercapacitor applications. View Full-Text
Keywords: TiO2; nanotubes; supercapacitors; transmission electron microscopy (TEM); electrochemical TiO2; nanotubes; supercapacitors; transmission electron microscopy (TEM); electrochemical
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Ahmed, F.; Pervez, S.A.; Aljaafari, A.; Alshoaibi, A.; Abuhimd, H.; Oh, J.; Koo, B.H. Fabrication of TiO2-Nanotube-Array-Based Supercapacitors. Micromachines 2019, 10, 742.

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