MWNTs/PANI composite materials prepared by in-situ chemical oxidative polymerization for supercapacitor electrode
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Multi-walled carbon nanotubes (MWNTs)/polyaniline (PANI) composite materials were prepared by in-situ chemical oxidative polymerization of an aniline solution containing well-dispersed MWNTs. The supercapacitive behaviors of these composite materials were investigated with cyclic voltammetry (CV), charge–discharge tests, and ac impedance spectroscopy, respectively. The composites based on the charge-transfer complex between well-dispersed MWNTs and PANI matrixes show much higher specific capacitance, better thermal stability, lower resistance, and were more promising for applications in supercapacitors than a pure PANI electrode. The highest specific capacitance value of 224 Fg−1 was obtained for the MWNTs/PANI composite materials containing MWNTs of 0.8 wt%. The improvement mechanisms of the capacitance of the composite materials were also discussed in detail.
KeywordsPANI Specific Capacitance Electrochemical Impedance Spectroscopy Composite Electrode High Specific Capacitance
The authors acknowledge the financial support by the National Natural Science Foundation of China (No. 50602020) and the National Basic Research Program of China (No. 2007CB216408).
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