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An improved technique for fabrication of carbon nanotube array electrodes has been proposed in this work. Firstly, carbon nanotubes (CNs) array electrodes were prepared by combsination of Chemical Vapor Decomposition (CVD) method and sputtering techniques in anodized aluminum oxide (AAO) membrane. The CNs/AAO was immersed into HF solution to remove the barrier layer. Controlling the immersing time, the CNs array electrodes with different length contacted with electrolyte can be prepared. The morphology of CNs array electrodes was observed by SEM. The electrochemical properties of CNs array electrodes were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetric curves of CNs array electrodes showed that the peak at about 1.0 V is increasing by the prolonging of the immersing time. But it changes slightly when the immersing time is more than 15min. It was anticipated that the main intercalation behavior of Li-ions in carbon nanotubes happens through the holes of ends of carbon nanotubes. The results of dynamic capacitances-potential curves showed that there is an anodic peak at about 1.0 V is which is corresponding to the Li~(+) intercalation process. It indicates a possible application of CNs array electrodes can be explored as electrochemical super-capacitors in Li-ion battery electrolytes.


AAO template, Carbon nanotubes, Array electrodes, Cyclic voltammetry, Electrochemical impedance spectroscopy

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