二茂铁/L-半胱氨酸修饰电极的电化学行为及电催化性能  

Electrochemical and Catalytic Properties of Ferrocene/L-cysteine Modified Electrode

作　　者：邓湘辉[1] 阚显文[1] 尉艳[1] 张文芝[1] 刘红英[1] 方宾[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,安徽芜湖241000

出　　处：《物理化学学报》2005年第12期1399-1402,共4页Acta Physico-Chimica Sinica

基　　金：教育部科技研究重点项目(00177);安徽省自然科学基金(050460301)资助~~

摘　　要：利用配对试剂将二茂铁酰胺键合在L-半胱氨酸自组装单层膜(SAM)表面,制成稳定的二茂铁/L-半胱氨酸修饰电极,该电极在pH7.0的磷酸盐缓冲液中有一对很好的氧化还原峰.运用循环伏安法和交流阻抗谱详细研究了修饰电极的电化学行为,测得电子转移系数为0.66,表观电极反应速率常数为6.86s-1.该修饰电极对肾上腺素有很好的催化作用,峰电流与肾上腺素浓度在2.0×10-7～1.0×10-5mol·dm-3范围内呈现良好的线性关系.Stable electrode modified by aminylferrocene/L-cysteine（L-Cys） was fabricated successtully by linking aminylferrocene to L-Cys self-assembled monolayer（SAM） with coupling reagent. The modified electrode exhibits a pair of reversible redox peaks in pH 7.0 phosphate buffer solution. The electrochemical behaviors of the modified electrode were explored in detail with cyclic voltammetry and a.c. impedance. The apparent electron transfer coefficient and standard rate constant were calculated to be 0.66 and 6.86 s-1 for the modified electrode respectively. The modified electrode shows electrocatalytic activity for oxidation of epinephrine （EP） in pH 7.0 phosphate buffer solution. The peak current was proportional to the concentration of EP in the range of 2.0×10^-7 - 1.0×10^-5 mol· dm^-3.

关 键 词：二茂铁酰胺 L-半胱氨酸 自组装单层膜 电催化 肾上腺素 

分 类 号：O646[理学—物理化学]