纳米氧化亚铜固载亚甲兰复合膜修饰玻碳电极的电化学性质及其对多巴胺的电催化  

Electrochemical properties of a nano-cuprous oxide and methylene blue composite modified glassy carbon electrode and its electrocatalysis to dopamine

作　　者：胡军福[1] 朱圣平[1] 杜飞鹏[2] 刘传银[1] 

机构地区：[1]郧阳师范高等专科学校化学系,丹江口442700 [2]华中科技大学化学系,武汉430074

出　　处：《分析试验室》2006年第7期5-9,共5页Chinese Journal of Analysis Laboratory

基　　金：湖北省教育厅重点科研项目资助(D200560002)

摘　　要：用十六烷基三甲基溴化铵为软模板制备了纳米氧化亚铜晶须,利用XRD和TEM进行表征。研究了纳米Cu2O-Nafion膜修饰玻碳电极的电化学性质,结果表明,纳米氧化亚铜在电极上表现出一对较为可逆的氧化还原峰,对应于Cu(Ⅱ)/Cu(Ⅰ)的氧化还原,峰电流与扫速成正比,表明纳米氧化亚铜在电极表面的电化学受表面控制。研究发现在亚甲基兰为媒介的情况下电极对多巴胺的催化能力进一步提高。在此电极上多巴胺呈现一对响应良好的准可逆氧化还原峰,峰电位差106 mV,峰电流大大提高,氧化峰电位大大降低,表现出良好的电催化作用。该电极可以在抗坏血酸存在下测定多巴胺。Cuprous oxide nanowhisker was prepared by using CTMAB as soft template, and was characterized by XRD and TEM methods. The electrochemical properties of nano-Cu2 O-Nation and nano-Cu2O-Nafion-MB modified electrodes were studied. The experimental results indicate that nano-Cu2O shows a couple of redox peaks corresponding to the redox of Cu（ Ⅱ ）/Cu（Ⅰ）, the peak currents are linear to the scan rates, which demonstrates that the electrochemical response of Cu2O is controlled by surface adsorption. However, the composite nano-Cu2O-Nafion-MB modified electrode shows a trend of decrease of peak currents corresponding to the Cu（Ⅱ）/Cu（Ⅰ）, and the electrocatalytical function to dopamine increase dramatically. At this composite electrode, dopamine shows a couple of quasi-reversible redox peaks with a peak separation of 106 mV, the peak current increasing largely and a decrease of peak potential about 200 mV for the oxidation of dopamine as compared to that at bare glassy carbon electrode. The composite electrode can be used to detect dopamine in the presence of ascorbic acid.

关 键 词：纳米氧化亚铜 电化学性质 多巴胺 电催化 

分 类 号：O657.1[理学—分析化学]