碱性介质中对苯二胺在铂微电极上的电化学聚合研究

采用循环伏安法,比较了酸性、中性和碱性介质下对苯二胺(p-PD)在铂微电极上的电化学聚合的异同,并探讨扫描速度、底物浓度等因素对p-PD在碱性体系下的电化学聚合行为的影响.结果表明,只有碱性介质才能得到吸附于电极的高分子膜;铂电极上p-PD的氧化反应为不可逆过程;在20~100 mV/s的扫描速率范围内,阳极峰电流与扫描速度的1/2次方成线性关系,表明该电极反应受扩散控制.

Electrochemical polymerization of p-phenylenediamine on Pt microelectrode in alkali medium

The electrochemical behaviors of p-phenylenediamine(p-PD) on Pt microelectrode in different aqueous media were studied by cyclic voltammetry technique,and the effects of scan rate and reactant concentration on electrochemical characteristics of p-phenylenediamine in alkaline medium were investigated systematically.The results showed that p-PD could be electrochemically polymerized only in alkaline aqueous solution.The oxidation of p-PD on Pt microelectrode was an irreversible process,and anodic peak currents depended linearly on the square root of scan rate over the range of 20~100 mV/s,which suggested that the process of the electrode reaction was controlled by the diffusion.