磺化4,4'-联苯二酚的电氧化行为

Electrooxidation Behaviors of Sulfonated 4,4′-Biphenyl Diphenol

通过电化学方法考察了磺化4,4'-联苯二酚在不锈钢电极表面的电氧化行为。并采用原位交流阻抗技术监测了电聚合反应前后电极之间的溶液阻抗响应。结果表明,磺化4,4'-联苯二酚在不锈钢电极表面发生的电氧化反应是不可逆的,起始氧化电压和峰值电压分别为0.95和1.2 V。电氧化反应后,由于聚合物膜的形成,电极之间的溶液阻抗增加了0.27Ω.cm2,增幅并不大,应该归功于联苯基团和磺酸基的双重促进效应。

The electrooxidative behaviors of sulfonated 4,4′-biphenyl diphenol were investated on the stainless steel electrode by electrochemical methods.The alternative current（AC） impedance responses of the electrolyte system between the electrodes before and after electrooxidation were also in situ monitored.The results show that the electrooxidation of sulfonated 4,4′-biphenyl diphenol is irreversible similar to those of other phenolic compounds,and the onset potential and peak potential are 0.95 V and 1.2 V,respectively.After electrooxidation,the corresponding AC impedance increases only by 0.27 Ω·cm2,possibly due to the formation of polymer film.This increase is slight,which is attributed to the double promoting effects of biphenol and sulfonated acid group.