物理化学学报 >> 1992, Vol. 8 >> Issue (04): 476-480.doi: 10.3866/PKU.WHXB19920410

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靛蓝胭脂红的光谱电化学研究 II. 靛蓝胭脂红复相电子转移动力学

沈报恩; 王桂良; 唐寅轩   

  1. 杭州大学化学系，杭州 310028
  • 收稿日期:1991-03-05 修回日期:1991-10-08 发布日期:1992-08-15
  • 通讯作者: 沈报恩

Spectroelectrochemical Investigation on Indigo Carmine II. Heterogeneous Electron Transfer Kinetics of Indigo Carmine

Shen Bao-En; Wang Gui-Liang; Tang Yin-Xuan   

  1. Department of Chemistry, Hangzhou University, Hangzhou 310028
  • Received:1991-03-05 Revised:1991-10-08 Published:1992-08-15
  • Contact: Shen Bao-En

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摘要： 报道了靛蓝胭脂红在SnO_2透光电极上的复相电子转移动力学参数。由光谱电化学和电化学两种实验方法测定。前一方法为单电位阶跃计时吸收法((SPS/CA)。后一方法为循环伏安法。两种方法的数据处理中均应用了计算机拟合, 较之文献中常规的工作曲线法更为简便、正确。两种方法测定的结果十分一致。进一步的研究表明, 动力学参数值与靛蓝胭脂红的浓度和溶液pH有关, 为靛蓝胭脂红在水溶液中的状态提供了重要信息。

关键词: 靛蓝胭脂红, 复相电子转移动力学, 光谱电化学

Abstract: The heterogeneous electron transfer kinetic parameters of Indigo Carmine at tin dioxide optically transparent electrode are reported here in this study. Both spectroelectrochemical and electrochemical techniques were used. In the former case, kinetic parameters were calculated from the normalized absorbance which was measured by absorbance versus time transient curve after serveral overpotential steps. A compu-ter data treatment method instead of the working curve method usually reported in literature was used in the calculation. In the later case, kinetic parameters were determined by measuring the difference of peak potentials ΔE_p of cathodic and anodic reference curve. The results obtained with both techniques had good coincidence. Further investigation shows that the value of kinetic parameters are dependent on Indigo Carmine concentration and solution pH values. It is considered as an important information for the electrochemical reduction mechanism of Indigo Carmine.

Key words: Indigo Carmine, Heterogeneous electron transfer kinetics, Spectroelectrochemistry