聚苯胺颗粒电极的制备与其电化学行为

采用循环伏安法,以含苯胺(An)的硫酸溶液为电解质,采用循环伏安技术在Pt微盘电极上得到随机、不连续沉积的聚苯胺(PAn)微颗粒和PAn膜.实验结果表明:H2SO4浓度、苯胺浓度、电位扫描上限和扫速对电化学合成随机、不连续沉积的PAn微颗粒具有重要影响.不连续随机沉积的PAn微颗粒电极与PAn膜电极在锂离子(Li-ion)电池电解质溶液中的行为有明显差异,不连续随机沉积的PAn微颗粒电极可以清楚地得到氧化还原电流峰,而PAn膜电极无法形成清晰的氧化还原电流峰.采用较缓慢扫描速度更有利于形成良好"结晶"的不连续PAn颗粒电极,该种电极可以同时具有高比能量和可逆性能.

Electro-generation and Electrochemical Behavior of Granular Polyaniline

Stochastic and discrete polyaniline (PAn) granule were formed by the technique of cyclic voltammetry (CV) on Pt micro-disk electrode in H2SO4 aqueous solution of aniline(An). The results proved that electrochemical synthesized conditions, such as, concentration of H2SO4, aniline(An) and reverse potential of scan scope, scan rate, had obvious effect on the formation of stochastic and discrete PAn granule. The electrochemical behaviors of the type of granular PAn were investigated in normal electrolyte of Li-ion battery. The results proved that there were clear anodic current peak and cathodic current peak on the CV curves of the type of granular PAn. Meanwhile, the current peaks would disappear on PAn film sample electrode. The larger PAn granule, which formed at slower scan rate of electrochemical synthesized condition, not only exhibited higher capacity but also exhibited high degree reversible redox behavior.