Authors: Jie Wang Youlong Xu Jianbo Zhu Yang Bai Shengchun Mao Lilong Xiong
Publish Date: 2016/02/10
Volume: 20, Issue: 5, Pages: 1413-1420
Abstract
Conducting polypyrrole PPy is an attractive material for supercapacitors with a high specific capacitance and environmental friendliness feature but it suffers from the limited power density and short cycling life due to the low ionic mobility and mechanic stress resulting from ions in/out solid phase respectively Here we present PPy–ptoluenesulfonate TOS and functionalized singlewalled carbon nanotube FSWNT nanorodlike composites deposited by pulse current method in TOS and FSWNT dispersive solutions with a diameter of less than 20 nm due to the improved FSWNT concentration near the polymerization interface during pulseoff time The reduced ion diffusion length and the high diffusion coefficient of PPy–TOS synthesized by pulse current method lead to the nanocomposites with a high specific capacitance of 360 F g−1 at a current loading of 20 A g−1 and an ultrafast charging/discharging capability with a value of 280 F g−1 at even 01 s Moreover the fine nanostructure which can accommodate the mechanical stress during charging/discharging process significantly prolongs the cycling life of the nanocomposites with its capacitance well maintained of 80 after 100000 continuous cycles at a current load of 400 A g−1 All of these enable the nanocomposites to be excellent active materials for highperformance supercapacitorsThe authors thank the financial support by the National Natural Science Foundation of China Grant No 21274115 21203145 and 51201128 Program for New Century Excellent Talents in University of China Grant No NCET110433 and Specialized Research Fund for the Doctoral Program of Higher Education of China Grant No 20110201130005 The authors also thank Ms Yanzhu Dai and Mr Chuansheng Ma at International Center for Dielectric Research for their help in using SEM and TEM respectively
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