石墨烯化石墨/聚苯胺电极的制备及电容特性

通过电解剥落得到的表面石墨烯化的石墨电极(graphene layers/graphite plate, GL/GP)为基底,在硫酸介质中以苯胺为单体,采用循环伏安法(cyclic voltammetry, CV)制备了表面石墨烯化的石墨/聚苯胺(graphene layers/graphite plate/polyaniline, GL/GP/PANI)电极,并探究聚合圈数对GL/GP/PANI电极比电容的影响。利用场发射扫描电镜(scanning electron microscope, SEM)对电极材料的形貌进行表征。在0.5 M H₂SO₄电解液中,对合成的电极材料进行循环伏安、恒电流充放电(chronopotentiometry, CP)和电化学稳定性测试。结果表明,在表面石墨烯化的石墨电极上合成的PANI具有棒状结构,电流密度为0.085 mA/cm²时, GL/GP/PANI电容器的比电容可达1 042.8 F/g。提供了一种新的超级电容材料基底电极的构建方式。

Polyaniline modified graphene layers/graphite plate electrode for supercapacitor

Polyaniline modified graphene layers/graphite plate (GL/GP/PANI) electrodes were prepared by electrochemical polymerization of aniline on graphene layers/graphite electrodes, which were obtained via in-situ formation of graphene layers on graphite plate by electrochemical exfoliation. The effect of polymerization cycle to specific capacitance of GL/GP/PANI was investigated. The surface features of the electrodes were characterized by SEM. The electrochemical performances of the electrodes were measured in 0.5 M H₂SO₄ electrolyte, including cyclic voltammetry, galvanostatic charge-discharge and electrochemical stability test. The results indicated that the PANI on the GL/GP electrodes had rodlike structure. At current density of 0.085 mA/cm², the specific capacitance GL/GP/PANI reached 1 042.8 F/g. This study provided a new way to fabricate substrate electrode material for supercapacitor.