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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (11): 1118-1125. 上一篇    下一篇

研究论文

碳纤维微电极研究 ⅩⅩ.甲苯胺盐在碳纤维微盘电极上的电化学性质

鞠晃先;陈洪湘   

  1. 南京大学化学系
  • 发布日期:1994-11-15

Investigation on carbon fiber microelectrodes.ⅩⅩ.The electrochemical behaviours of toluidine blue at a carbon fiber microdisk electrode

JU HUANGXIAN;CHEN HONGXIANG   

  • Published:1994-11-15

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研究了甲苯胺盐在碳纤维微盘电极上的电化学行为,探讨了pH 对甲苯胺盐电极反应过程的影响,确定在pH<3.7,3.75.5时,参与电极过程的H^+数分别为3,2和1,测定了甲苯胺盐的扩散系数及在碳纤维微盘电极上的电荷转移系数α,标准电子转移速率常数k^α和式量电位E^α,提出了不同pH下电极反应的机制.对甲苯胺盐在碳纤维微盘电极上的吸附性能进行了探索, 并测定了吸附控制条件下的动力学参数

关键词: 吸附, 扩散系数, 碳纤维, 微电极, 电极反应, pH值, 国家自然科学基金委员会青年基金, 甲苯胺盐

The electrochem. behavior of toluidine blue (TB) at a carbon fiber microdisk electrode was studied. The effect of pH on the electrode process was investigated, and the no. of H+ in the electrode process is 3 at the range of 1.5 ~ 3.7, 2 at pH 3.7 ~ 5.5 or 1 and pH5.5 ~ 10.7, resp. The apparent standard heterogeneous electron transfer rate constant k0', and E0' of TB at various pH on the carbon fiber microdisk electrode were determine The overall electrode reaction mechanism of toluidine blue was proposed. The adsorbability of TB on the electrode was studied, and the kinetics parameters in the control of adsorption process were determine

Key words: ADSORPTION, DIFFUSION COEFFICIENTS, CARBON FIBERS, MICROELECTRODE, ELECTRODE REACTION, PH VALUE

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