摘要
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。
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 H2SO4 solution 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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第S1期120-125,共6页
CIESC Journal
基金
国家自然科学基金项目(20676089)
山西省自然科学基金项目(2007011029)
山西省回国留学基金项目(2008-32)~~
关键词
单极脉冲
聚苯胺
电化学聚合
超级电容器
电容性能
unipolar pulse
polyaniline
electrochemical polymerization
supercapacitor
capacitive performance
