多壁碳纳米管/壳聚糖多层膜修饰电极的电化学行为研究

Studies of Electrochemical Behavior on Multi-Walled Carbon Nanotubes/Chitosan Multilayers Modified Glass Carbon Electrodes

采用新型分散方法制备了多壁碳纳米管/壳聚糖多层膜修饰玻碳电极,研究了在修饰剂总量相同的情况下,不同修饰层数膜电极的循环伏安、计时库仑曲线及电化学阻抗行为,并采用交流阻抗等效电路分析方法,对拟合的阻抗数据进行了解析。结果表明,电极的膜修饰层数的增加,不仅使膜层的缺陷增多,而且使电极的界面阻抗、溶液阻抗和电子转移阻抗明显减小,电极反应逐渐呈Warburg扩散阻抗特征,从而使电极的灵敏度和可逆性得到改善。

The paper adopted new dispersion method of nanotubes in chitosan solution to construct muhiwalled carbon nanotubes/chitosan（MWNT/CHI） modified glass carbon electrodes. The cyclic voltammograms, ehronocoulometry,EIS and especially the corresponding equivalent circuit of EIS of the modified electrodes with various layers were studied. The experimental results showed that the lacuna of the electrode were manifolded with the increase of the layers ,while the electrode surface resistance,solution resistance and charge transfer resistance were reduced remarkably. Moreover, the electrode reaction process appeared to be dominated by Warburg diffusion. Therefore, the sensitivity and reversibility of the electrode were improve with the increase of the layers.