脉冲电流法电解合成聚苯胺

Electrodepositing Polyaniline by Pulse Galvanostatic Method

在 0 .2 mol/ L苯胺和 0 .5 mol/ L H2 SO4介质中采用脉冲电流法电解合成聚苯胺 (PANI)膜 .循环伏安研究表明 ,与恒电流法相比 ,脉冲电流法制得的 PANI膜具有更好的电化学活性 .扫描电镜 (SEM)对膜层的微观形貌观察发现 ,这种特殊的聚苯胺膜层呈纳米纤维状结构 ,不同于恒电流法制取的颗粒状 PANI膜 .讨论了脉冲通断比和频率对于膜层性能的影响 .

A new method, pulse galvanostatic method(PGM) is proposed to synthesize polyaniline(PANI) films in 0.2 mol/L aniline and 0.5 mol/L H 2SO 4 aqueous solution. Cyclic voltammogram in 0.5 mol/L H 2SO 4 solutions show that the films of PANI obtained by PGM are more electroactive than those by galvanostatic method(GM). The micrograph of polyaniline films has been investigated by scanning electron microscopy. The nano-fibrous structure can be observed for the polyaniline films by PGM, while the polyaniline films by GM show a granular structure. Additionally, the influence of t on/t off and frequency of PGM on the properties of polyaniline has also been discussed. Electrochemical research shows that the anodic peak current of CVs has a maximum value in the plot of peak current density relating to t on/t off. Meanwhile, the peak current increases with the imcrease of frequency.