MEMS超级电容器用聚吡咯/炭材料复合膜电极的制备及其性能  

Preparation and performance of carbon/polypyrrole membranes as an electrode in supercapacitors

作　　者：霍晓涛[1,2] 朱平[1,2] 韩高义[3] 熊继军[1,2] 

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]中北大学电子测试技术重点实验室,山西太原030051 [3]山西大学分子科学研究所,山西太原030006

出　　处：《新型炭材料》2013年第6期414-420,共7页New Carbon Materials

基　　金：山西省自然科学基金(2012011010-2)~~

摘　　要：采用电化学沉积工艺,在MEMS超级电容器的三维结构集流体上制备出聚吡咯(PPy)、聚吡咯/碳纳米管(PPy/CNT)、聚吡咯/石墨烯(PPy/GR)三种类型的膜电极。采用SEM对三种膜电极进行形貌观察,采用循环伏安、交流阻抗、恒电流充放电和循环充放电研究三种膜电极的电化学电容性能。结果表明,复合电极的微观结构稳定,复合薄膜和集流体之间的结合力大;基于三种膜电极的MEMS超级电容器电容量依次增大,阻抗依次减小,放电电流为1 mA时,比电容分别达到7.0、8.0、8.3 mF/cm2,经过5 000次恒流充放电循环后,电容器的比电容分别保持了原来的72.9%、85.0%和89.2%。在PPy电极中引入CNT或GR后,MEMS超级电容器的电化学和膜电极结构稳定性可得到明显改善。Three membrane electrodes for supercapacitors in micro-electro-mechanical-systems （MEMS） were made of polypyr- role （PPy）, carbon nanotube/polypyrrole （CNT/PPy） and graphene/polypyrrole （GR/PPy） electrodeposited on current collectors. The samples were characterized by scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge. Results indicate that there are strong adhesive forces between the electrode materials and the current collectors. The electrode resistances decrease in the order of PPy, CNT/PPy and GR/PPy. The specific capacitances are 7.0,8.0 and 8.3 mF/cm2 at a discharge current of 1 mA and their retention rates after 5 000 charge/discharge cycles are 72.9,85.0 and 89.2% for PPy, CNT/PPy and GR/PPy, respectively. The electrochemical performance and stability of the MEMS supercapacitors are improved significantly by adding CNTs or graphene to PPy.

关 键 词：MEMS 超级电容器 聚吡咯 碳纳米管 石墨烯 

分 类 号：TM53[电气工程—电器]