Journal
APPLIED SURFACE SCIENCE
Volume 341, Issue -, Pages 109-119Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.02.142
Keywords
Vertically aligned carbon nanotubes; Electrophoretic deposition; Anodic aluminum oxide; Ionic liquid; Electrochemical double layer capacitor
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Funding
- Iran National Science Foundation (INSF), Iran [93/36575]
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Multi-wall carbon nanotubes (MW-CNTs) have been arranged in nanochannels of anodic aluminum oxide template (AAO) by electrophoretic deposition (EPD) to make a vertically-aligned carbon nanotube (VACNT) based electrode. Well ordered AAO templates were prepared by a two-step anodizing process by applying a constant voltage of 45 V in oxalic acid solution. The stabilized CNTs in a water-soluble room temperature ionic liquid (1-methy1-3-octadecylimidazolium bromide), were deposited in the pores of AAO templates which were conductive by deposition of Ni nanoparticles in the bottom of pores. In order to obtain ideal results, different EPD parameters, such as concentration of MWCNTs and ionic liquid on stability of MWCNT suspensions, deposition time and voltage which are applied in EPD process and also optimal conditions for anodizing of template were investigated. The capacitive performance of prepared electrodes was analyzed by measuring the specific capacitance from cyclic voltammograms and the charge-discharge curves. A maximum value of 50 Fg(-1) at the scan rate of 20 mV s(-1) was achieved for the specific capacitance. (C) 2015 Elsevier B.V. All rights reserved.
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