巯基钴卟啉自组装膜的表征及催化性能  

The Characterization of Mercapto Porphyrincobalt (Ⅱ) Self-assembled Monolayers and Its Electrocatalysis

作　　者：卢小泉[1] 靳军[1] 朱开梅[1] 张焱[1] 康敬万[1] 

机构地区：[1]西北师范大学化学研究所,兰州730070

出　　处：《分析化学》2001年第10期1178-1180,共3页Chinese Journal of Analytical Chemistry

基　　金：甘肃省自然科学基金;西北师范大学创新基金资助课题

摘　　要：用自制的新型尾式巯基钴（Ⅱ）卟啉在金电极上制成自组装单分子膜，并用ＸＰＳ，ＳＥＭ和电化学的方法进行了表征。该膜对抗坏血酸具有良好的催化作用，其氧化过电位较裸金电极上降低了１４０ ｍＶ，响应电流与抗坏血酸（ＡＡ）的浓度在 ７．８ × １０－５ｍｏｌ／Ｌ～１．０×１０－２ｍｏｌ／Ｌ的范围内具有良好的线性关系，相关系数为 ０．９９８１；检测下限为 １．３ × １０－８ｍｏｌ／Ｌ（富集 １０ｍｉｎ）。A gold electrode modified by mercapto porphyrin-cobalt (Ⅱ) (MpptpCo(Ⅱ)) has been prepared. The properties of the MpptpCo (Ⅱ)-self-assembled monolayer (SAM) modified electrode was investigated by X-ray photoelectron spectrometry and scanning electron microscopy (SEM) as well as electrochemical methods. This MpptpCo(Ⅱ)-SAM modified electrode could successfully used for the electrocatalytic oxidation of ascorbic acid (AA). Compared with bare gold, the modified electrode can reduce the anodic overpotential of AA by 149 mY. The catalytic currents increased linearly with AA concentration in the range of 7.8 × 10-5 mol/L 1× 10-2 mol/L with the correlation coefficient of 0. 9981. The detection limit is 1. 3 × 10-8 mol/L with 10 mm accumulation. The modified electrode showed excellent reproducibility.

关 键 词：巯基钴 卟啉 自组装膜 抗坏血酸 表征 催化氧化 电化学行为 

分 类 号：O646[理学—物理化学]