碳纳米管阵列电极的构建及电化学研究

The Fabrication and Electrochemical Studies on Carbon Nanotube Array Electrodes

本文提出一种改进的氧化铝模板法制备碳纳米管阵列电极:首先结合气相化学沉积和磁控溅射在氧化铝模板中制得碳纳米管阵列电极,然后用HF溶液将沉积了碳纳米管的氧化铝模板阻挡层除去,控制溶出时间即可得到不同溶出长度的碳纳米管阵列电极.循环伏安测试表明,锂离子在该阵列电极中的嵌入脱出反应主要发生在碳纳米管的端口处.此外,还应用固定频率交流阻抗法,研究了不同溶出时间的碳纳米管阵列电极的电容性质.

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.