聚吡咯
超级电容器
循环伏安法
介电谱
材料科学
傅里叶变换红外光谱
扫描电子显微镜
分析化学(期刊)
拉曼光谱
电极
掺杂剂
电化学
聚合
电容
导电聚合物
化学工程
复合材料
化学
兴奋剂
有机化学
聚合物
光电子学
光学
物理
工程类
物理化学
作者
Amit Kumar,Rajiv Kumar Singh,Himanshu Singh,Pankaj Srivastava,R. N. Singh
标识
DOI:10.1016/j.jpowsour.2013.07.121
摘要
Polypyrrole/carbon (PPy/C) composites have been synthesized using varying concentration of p-toluenesulfonate (pTS) dopant by surface initiated in-situ chemical oxidative polymerization with the purpose to develop an electrode material for supercapacitors. The influence of pTS on the structure of the composite is observed through Fourier transform infrared (FT-IR) and Raman spectroscopy while the morphological features have been examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The dc conductivity shows direct correlation with pTS concentration and follows Mott's three dimensional variable range hopping (3D-VRH) charge transport. The performance of PPy/C composite electrode for charge storage has been analyzed using electrochemical tools such as cyclic voltammetry and electrochemical impedance spectroscopy. The maximum specific capacitance ∼395 F g−1 in 0.5 M Na2SO4 aqueous solution with significant stability (∼500 cycles) is obtained for the material synthesized using equimolar concentration (0.1 M) of pTS to pyrrole.
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