导电聚吡咯薄膜的大过电位现象  

The Large Overpotential of the Conductive Polypyrrole Film

作　　者：黄赣辉[1] 邓少平 詹月华 

机构地区：[1]南昌大学食品科学教育部重点实验室,江西南昌330047 [2]浙江工商大学感官科学实验室,浙江杭州310035

出　　处：《南昌大学学报（理科版）》2006年第4期368-371,共4页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(No.30060025)

摘　　要：导电聚吡咯薄膜的大过电位是一个有趣而被忽视的现象,针对它在形成机理、膜表面微观结构等方面进行了系统实验研究。结果表明,聚吡咯薄膜大过电位现象在水相条件也存在,同时具有选择性吸附电流特点,产生这一现象与掺杂阴离子性质、种数、浓度及由此而导致的聚合有序性相关。负电位下掺杂大直径对阴离子的聚吡咯薄膜由于在还原下脱掺杂困难,Na+、K+、L i+等水化小阳离子对聚吡咯链的吸附中和是导致吸附电流的产生和薄膜结构形态上变化的主要原因。The large overpotential of the Polypyrrole film is interesting but generally ignored, in this paper, the formation theory of the large overpotential and surface microcosmic structure change of the film are studied systemically. The results indicate that the large overpotential is present in aqueous system and is characteristic of selectively adsorbing current. This phenomenon relates to the properties, kinds and concentration of the doped counter-anions and its consequent order status. In negative potential,the PPy film is reduction,but the big diameter counter-ainons doped in the PPy film are difficult to dedope, consequently, the small hydrated cations such as Na^＋ , K^＋ , Li^＋ etc. insert into the PPy chain in order to neutralize the surplus negative charge, which contributes to the absorptive current and the structure change of the PPy film.

关 键 词：导电聚吡咯 大过电位 吸附电流 薄膜结构 

分 类 号：O646.54[理学—物理化学] O657.1[理学—化学]