钴卟啉修饰电极对分子氧电催化还原的扫描隧道显微镜研究

Investigation of Metalloporphyrin Modified HOPG and GC Electrodes by Scanning Tunneling Microscope

利用扫描隧道显微镜(STM)研究了高定向热解石墨(HOPG)和玻璃碳电极(GC)表面的性质,并对修饰钻卟啉后的表面形貌变化进行了探讨.结合修饰钴卟啉前后的循环伏安结果和STM形貌图,讨论了电极表面的结构对分子氧的电催化还原反应的影响.从微观角度阐述了GC电极对氧的电催化还原活性明显高于HOPG电极的内在因素,为修饰电极的表面性能研究提供了经验.

HOPG and GC electrode surface feature modified with Cobalt methyltetraphenylorphyrins (CoTPP) was investigated by scanning tunneling microscope combined with cyclic voltammograms. The effect of electrode surface morphologies on the electrocatalytic activity for dioxygen reduction was discussed in detail. It was explained in nanometer scale that catalytic activity of the GC electrode was obviously higher than that of HOPG electrode for dioxygen reduction. These results show that STM is a powerful tool for modified electrode surface characterizations.