化学学报 ›› 1994, Vol. 52 ›› Issue (7): 646-651. 上一篇    下一篇

研究论文

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

李晶;张柏林;汪尔康   

  1. 中国科学院长春应用化学研究所;中国科学院电分析开放研究实验室
  • 发布日期:1994-07-15

Investigation of metalloporphyrin modified HOPG and GC electrodes by scanning tunneling microscope

LI JING;ZHANG BOLIN;WANG ERKANG   

  • Published:1994-07-15

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, 并对修饰钴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HPOG电极的内在因素,为修饰电极的表面性能研究提供了经验。

关键词: 化学修饰电极, 循环伏安法, 玻碳电极, 表面形貌, 钴卟啉, 扫描隧道显微镜, 分子氧, 电催化还原, 高定向热解石墨

HOPG (highly oriented pyrolytic graphite) and GC (glassy carbon) electrode surface feature modified with cobalt methyltetraphenylporphyrin (CoTPP) was investigated by scanning tunneling microscope combined with cyclic voltammograms. The effect of electrode surface morphologies on the electrocatalytic activity for oxygen 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.

Key words: CHEMICAL MODIFIED ELECTRODE, CYCLOVOLTAMGRAPH, GLASSY CARBON ELECTRODE, SURFACE MORPHOLOGY, SCANNING TUNNELING MICROSCOPE

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