现场时间分辨拉曼光谱研究不同pH值溶液中聚吡咯电极的氧化还原和降解  

In Situ TIME-RESOLVED RAMAN SPECTROSCOPIC STUDIES OF REDOX PROCESS AND DEGENERATION OF PPY ELECTRODES IN SOLUTIONS WITH VARIOUS pH

作　　者：高劲松[1] 田中群[1] 薛奇[1] 

机构地区：[1]厦门大学团体表面物理化学国家重点实验室化学系,南京大学化学系

出　　处：《光谱学与光谱分析》1996年第1期47-52,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金;厦门大学固体表面物理化学国家重点实验室资助

摘　　要：对不同ｐＨ值溶液中聚毗咯的电化学氧化还原行为进行了现场时间分辨拉曼光谱研究。结果表明，采用拉曼－循环伏安图可以克服充电电流给聚吡咯氧化还原峰电位的确定带来的困难。本文讨论了拉曼－循环伏安图中峰电位相对于常规循环伏安图中的氧化还原峰电位发生负移的原因。在酸性溶液中氧化还原时会出现与一定氧化程度的、质子化的聚吡咯链段有关的不稳定中间产物，这是常规拉曼光谱所不能获得的，体现了电化学现场时间分辨拉曼光谱方法的优越性。The redox process and degeneration of polypyrrole(PPY)in solutions with various PH have been studied by in situ time-resolved Raman spectroscopy. The results show thatthe difficulties of defining the electrode potential of oxidation and reduction peaks of PPY canbe overcome by the treatment of CV-Raman. The origin of negative shift for the peak potentials of CV-Raman curves compared with that of cyclic voltamograms is dicussed. Unstableintermediate which may be related to protonated PPY with a certain degree of oxidation stateproduced during the redox process of PPY in acidic solutions is founa. It cannot be observedby conventional Raman spectroscopic method. The above results demonstrate the advantagesof in situ time-resolved Raman spectroscopic technique.

关 键 词：散射谱 聚吡咯 氧化还原 降解 电化学 

分 类 号：O657.1[理学—分析化学] O657.37[理学—化学]