Micro-supercapacitors based on three dimensional interdigital polypyrrole/C-MEMS electrodes

被引:176
作者
Beidaghi, Majid [1 ]
Wang, Chunlei [1 ]
机构
[1] Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA
关键词
Micro-supercapacitor; Carbon-microelectromechanical system; Interdigital electrodes; Polypyrrole; Specific capacitance; CARBON NANOTUBES; FABRICATION; FILMS; CAPACITANCE; COMPOSITE; TRANSPORT;
D O I
10.1016/j.electacta.2011.08.054
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Symmetric micro-supercapacitors with three dimensional (3D) interdigital electrode structures have been designed and fabricated through Carbon-microelectrochemical system (C-MEMS) technology. The micro-supercapacitor consists of a 3D C-MEMS structure which serves as a high effective surface area current collector and conformal polypyrrole (PPy) films deposited on the carbon structures as electroactive materials. The electrochemical performance of single electrodes and symmetric micro-supercapacitor cells were evaluated by cyclic voltammetry (CV) at different scan rates and galvanostatic charge/discharge tests. The effect of the 3D electrode structure on the performance of the micro-supercapacitor was studied. Single PPy/C-MEMS electrodes presented a specific capacitance of 162.07 +/- 12.40 mF cm(-2) and a specific power of 1.62 +/- 0.12 mW cm(-2) at 20 mV s(-1) scan rate. The symmetric micro-supercapacitor cells exhibited an average specific capacitance of 78.35 +/- 5.67 mF cm(-2) and a specific power of 0.63 +/- 0.04 mW cm(-2) at 20 mV s-1 scan rate, demonstrating that 3D micro-supercapacitors are promising for applications that require high power in a limited footprint area of the device. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:9508 / 9514
页数:7
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