聚苯胺对DMcT氧化还原反应的电催化作用

采用循环伏安法和交流阻抗法研究了聚苯胺 (PAn)对 2 ,5 二巯基 1,3 ,4 噻二唑 (DMcT)氧化还原反应的电催化作用及其DMcT/PAn复合物的电化学性能。结果表明 ,PAn膜电极在含饱和DMcT电解质溶液中不仅可以形成DMcT/PAn复合物 ,而且复合物电极呈现的氧化还原的峰电位差较电极未修饰前明显减少。DMcT/PAn复合物电极和PAn电极在 1.0mol/LHCl溶液中呈现相似的复数平面图 ,但在开路电位下在高频段的半圆的直径前者大于后者 ,而在 1.0V电位下则前者小于后者。因此认为在DMcT/PAn复合物中 ,DMcT是主要的电活性物质 ,PAn则可以较大程度地提高复合物的导电性和电荷传递速度 ,对DMcT的氧化还原反应有显著的催化作用。

Electrocatalytic effects of polyaniline on the redox reaction of 2,5-dimercapto-1,3,4-thiadiazole (DMcT)

The electrocatalytic effects of polyaniline (PAn) on the redox reaction of 2,5 dimercapto 1,3,4 thiadiazole (DMcT) were investigated using electrochemical techniques, including cyclic voltammetry and AC impedance spectroscopy. The results show that on polyaniline electrode, the DMcT/PAn adduct can be formed in the solution containing both supporting electrolyte and saturated DMcT, and the isolation of the anodic and cathodic peak potential is obviously smaller than that on bare electrode. The electrochemical spectrum for DMcT /PAn adduct is a semi circle in the high frequency range, which is similar to that of polyaniline. How ever, the diameters of semi circles for DMcT/PAn adduct become larger than that of polyaniline at open circuit potential, whereas the former is smaller than the latter at 1.0 V. DMcT is the major active substance, and PAn can obviously enhance the conductance and charge transfer rate of DMcT/PAn adduct. The electrocatalytic activity of the adduct is higher than that of DMcT or PAn used alone.