摘要
在Pb（NO3）2和HNO3的混合电镀液中,采用循环伏安法在石墨板基底上沉积PbO2薄膜电极,利用SEM、XRD等方法研究了二氧化铅电极的表面形貌和晶型。用实验所制备的PbO2薄膜电极作正极,活性碳电极作为负极,1.28 g.cm-3H2SO4溶液作电解液组装成混合超级电容器。在0.8~1.86 V的充放电位区内,500 mA.g-1电流密度下,活性碳与PbO2的质量比为2.5：1时,混合电容的比容量可达96.8 F.g-1,而且经过2 000多次深循环比容量仍能达到89.2 F.g-1,容量保持率高达92%以上且有很好的稳定性。循环伏安法制备的石墨基PbO2电极在超级电容中具有很好的电化学性能,石墨板在浓硫酸中是一种很好的集流体材料。
Cyclic voltammetric deposition method was applied to deposit PbO2 film on graphite substrate from the 1 mol HNO3＋0.5 mol Pb（NO3）2 solution,the lead dioxide electrode were characterized by SEM and XRD techniques as well.Hybrid supercapacitor cells were assembled with the PbO2 thin film as positive electrode and the activated carbon（AC） as negative electrode separated by a porous cellulosic separator in the 1.28 g·cm-3 density or 5.3 mol H2SO4 solution.The PbO2/AC hybrid supercapacitor,with a mass catio 2.5-：-1,showed a sloping voltage profile from 0.8 V to 1.86 V,and it could deliver a specific capacitance of 96.8 F·g-1 at a discharge current density of 500 mA·g-1.After over 2 000 deep cycles,the specific capacity only faded to 89.2 Fg-1,i.e.,decreased 8% from its initial value.The PbO2 film electrode deposited by cyclic voltammetric methed that exhibited an excellent electrochemistry characteristics in supercapacitor,which was an excellent current collector stuff in H2SO4 environment..
出处
《南昌大学学报（理科版）》
CAS
北大核心
2011年第2期169-174,共6页
Journal of Nanchang University(Natural Science)
基金
国家自然科学基金资助项目(20663005)
关键词
二氧化铅电极
循环伏安电沉积
石墨基
混合超级电容
lead dioxide electrode
cyclic voltammetric deposition
graphite substrate
hybrid supercapacitor
