单极脉冲电合成聚苯胺膜及其超级电容性能

采用单极脉冲电化学聚合方法在铂基体表面制备了具有三维网络结构的聚苯胺(PANI)纳米纤维膜。采用傅里叶变换红外(FT-IR)光谱和扫描电镜(SEM)分析比较了脉冲聚合和循环伏安聚合膜的组成和形貌,在0.5mol·L-1的硫酸溶液中通过恒电流充放电和电化学阻抗(EIS)等考察了聚合膜的电化学容量性能。研究表明,固定脉冲电压1.0V、苯胺单体浓度0.2mol·L-1时控制单极脉冲频率1.25s-1、占空比50%可获得高达699F·g-1比电容的纳米纤维结构PANI膜;聚合膜呈现均匀的三维有序网络状分布,其离子交换容量、循环稳定性及超级电容性能远高于循环伏安法聚合的PANI膜。

Unipolar pulse electrochemical polymerization of polyaniline nanofiber films for supercapacitor applications

Polyaniline （PANI） naonfiber films with three-dimensional network structure were successfully prepared on platinum substrates using unipolar pulse electrochemical polymerization.The composition and morphology of PANI films prepared by pulse and CV polymerization were characterized by Fourier transfer infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM）.The supercapacitive performances of the PANI films were also investigated in 0.5 mol·L^-1 H2SO4solution with cyclic voltammetry （CV） cycling in the range -0.2 V to 0.55 V （vs SCE），charge/discharge tests and electrochemical impedance spectroscopy （EIS）.Results show that three-dimensional porous network PANI films with uniform distribution on Pt are formed by this new method.The PANI films of pulse electrochemical polymerization display much higher ion exchange capacity，better stability and more excellent supercapacitive performances than the PANI films produced by the more common CV method.The highest specific capacitance value of 699 F·g^-1 is obtained for PANI film when the pulse potential，aniline concentration，pulse frequency and duty cycle are 1.0 V，0.2 mol·L^-1，1.25 s^-1 and 50%，respectively.