Pulse polymerized polypyrrole electrodes for high energy density electrochemical supercapacitor

被引：205
作者：
Sharma, R. K. [1 ]
Rastogi, A. C. [1 ]
Desu, S. B. [1 ]
机构：
[1] Univ Massachusetts, Dept Elect & Comp Engn, Amherst, MA 01003 USA
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 02期
关键词：
pulse polymerization; electrochemical electrode; polypyrrole; supercapacitor; energy density;
D O I：
10.1016/j.elecom.2007.12.004
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A novel method of pulsed polymerization for pyrrole exhibiting highest capacitance and very high energy density polypyrrole supercapacitor is reported. Stable polypyrrole films with good electrochemical reversibility and high doping degree were obtained by applying ultra short on time current pulse for polymerization. Pulse on time plays an important role in controlling chain size and chain defects whereas pulse off time contributes in polymer conjugation and orientation. A regime of pulse on time is identified to yield highly capacitive and stable films for supercapacitor application. Very high specific capacitance of 400 F/g and an unexpectedly high energy density of 250 Wh/kg were obtained form pulsed polymerized ordered polypyrrole structures in acidic electrolyte. Stability tests performed on pulsed polymerized pPy electrode yield long cycling life up to 10,000 cycles at charge/discharge current density of 5 mA/cm(2). (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：268 / 272
页数：5
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