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系统地研究了溶剂、温度和聚合电流密度对电化学制备本征导电聚吡咯(PPy)膜密度的影响,分别用四探针法和热失重(TG)法研究了不同密度的PPy膜的电导率和热稳定性.用循环伏安法(CV)和电化学阻抗谱(EIS)法比较了不同密度的PPy膜的电化学性能.研究表明,在室温下,在乙氰/水(AN/H2O,99/1)溶液比在水溶液中容易得到高密度的PPy膜.高聚合电流密度(如10mA/cm2)可以进一步提高PPy膜的密度,用X射线光电子能谱(XPS)对其结构进行了分析.在AN/H2O(99/1)溶液中用小电流密度(0.1mA/cm2)聚合时,低温(-20℃)有利于提高PPy膜的密度;然而在高电流密度(10mA/cm2)时,低温(-20℃)不利于提高PPy膜的密度.高密度的PPy膜(1.42g/cm3)用电流密度10mA/cm2在0℃的AN/H2O(99/1)溶液中制得.该合成方法和常用的低温低电流密度方法制备高密度的PPy膜相比,合成时间短,条件易实现,更利于实用化.更重要的是,高密度的PPy膜不仅具有高电导率(～220S/cm)和高热稳定性,还具有低的电化学活性.因此,高密度的PPy膜不仅是一种优异的电子导电的电极材料,而且是一种潜在的优异的防腐材料.
The effects of solvent, temperature and polymerization current density on the electrochemical density of PPy films were systematically investigated. The conductivity of PPy films with different densities were investigated by four-probe method and TG method respectively. The electrochemical properties of PPy films with different densities were compared by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that at room temperature, H2O, 99/1) solution is easier to obtain high density PPy film than aqueous solution.Polymerization current density (such as 10mA / cm2) can further increase the density of PPy film, the structure of which is characterized by X-ray photoelectron spectroscopy (XPS) (-20 ° C) is beneficial for increasing the density of PPy films when polymerized at low current density (0.1mA / cm2) in AN / H2O (99/1) solution. However, at high current density (10mA / cm2) ), Low temperature (-20 ℃) is not conducive to improve the density of PPy film.Pyramid film (1.42g / cm3) with a current density of 10mA / cm2 in 0 ℃ AN / H2O Compared with the commonly used methods of low temperature and low current densities, the synthesis method has the advantages of short synthesis time, easy implementation and more practical application than high-density PPy films, and more importantly, high-density PPy Not only has high conductivity (~ 220S / cm) and high thermal stability, but also has low electrochemical activity.Therefore, high-density PPy film is not only an excellent electronically conductive electrode material but also a potential excellent Anti-corrosion material.