循环伏安法共聚苯胺/吡咯及其超级电容性能

采用循环伏安法,以硫酸和对甲苯磺酸作为掺杂剂,在A304不锈钢基体表面制备了苯胺/吡咯共聚物膜(PANPY)。采用傅里叶变换红外光谱(FT-IR)和扫描电镜(SEM)分析由不同苯胺/吡咯摩尔比合成的PANPY的成分和形貌,在0.5 mol·L^-1硫酸溶液中通过循环伏安(CV)、恒电流充放电和电化学阻抗(EIS)考察了共聚膜的电化学容量性能。结果表明,随着吡咯浓度的增加,更多的吡咯单体进入PANPY中;当苯胺/吡咯摩尔比为1:1时,制得共聚膜PANPY(1/1),其表面主要由蘑菇云状颗粒和少量网状结构构成,其离子交换容量、循环稳定性及超级电容性能明显优于PANPY(1/2)和PANPY(2/1),其电荷转移电阻低至1.97 Ω,比电容高达227.88 F·g^-1。

Copolymerization of aniline/pyrrole by cyclic voltmmetric method and its supercapacitor performance

Poly(anilin-co-pyrrole)(PANPY)was synthesized on A304 stainless steel by the cyclic voltmmetric method from aniline/pyrrole with H₂SO₄ and p-TSA as dopant.The composition and morphology of PANPY films synthesized by different mole ratios of aniline/pyrrole were characterized by Fourier transfered infared spectroscopy(FT-IR)and scanning electron microscopy(SEM).The supercapacitor performance of the PANPY films were also investigated in 0.5 mol·L^-1 H₂SO₄ solution with cyclic voltammetry(CV)cycling in the range of-0.2 V to 0.7 V(vs SCE),charge/discharge tests and electrochemical impedance spectroscopy(EIS).The results showed that more pyrrole units were incorporated into the PANPY films when the concentration of pyrrole increased.The surface of PANPY(1/1)films synthesized from aniline/pyrrole(1:1 mole ratio)was mainly mushroom-like spheres with some network structure.The PANPY(1/1)films displayed much higher ion exchange capacity,better stability and excellent supercapacitor performance than PANPY(1/2)and PANPY(2/1).The charge transfer resistance of the PANPY(1/1)films was as low as 1.97 Ω,and the specific capacitance was up to 227.88 F·g^-1.