Effect of feeding ratios on the structure and electrochemical performance of graphite oxide/polypyrrole nanocomposites  

作　　者：HAN YongQin DING Bing ZHANG XiaoGang 

机构地区：[1]College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

出　　处：《Chinese Science Bulletin》2011年第26期2846-2852,共7页

基　　金：supported by the National Key Basic Research Program of China (2007CB209703);the National Natural Science Foundation of China (20633040 and 20873064);the Postdoctoral Science Foundation of China (20090461108)

摘　　要：Graphite oxide (GO)/polypyrrole (PPy) nanocomposites (GPYs) were synthesized using in situ polymerization.The effect of the feeding ratios of pyrrole and GO on the structure and electrochemical performances of GPYs was investigated.The structure was characterized via Fourier-transform infrared spectroscopy,scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The electrochemical performance was characterized via cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The results indicate that the more pyrrole is added to GO (with GO concentrations of 20% and 50%),the more agglomeration of both PPy and GO layers occurs.This is detrimental to the capacitance utilization of PPy.When the feeding ratio of GO:pyrrole is 80:20,PPys with nanofibrils are dispersed homogenously in/on the exfoliated layer of GO and the conductivity is enhanced.The capacitance utilization of PPy in a composite with a GO concentration of 80% (383 F/g) is higher than that of pure PPy (201 F/g),which indicates the presence of a synergistic effect between GO and PPy.Graphite oxide （GO）/polypyrrole （PPy） nanocomposites （GPYs） were synthesized using in situ polymerization. The effect of the feeding ratios of pyrrole and GO on the structure and electrochemical performances of GPYs was investigated. The structure was characterized via Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The electrochemical performance was characterized via cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results indicate that the more pyrrole is added to GO （with GO concentrations of 20% and 50%）, the more agglomeration of both PPy and GO layers occurs. This is detrimental to the capacitance utilization of PPy. When the feeding ratio of GO： pyrrole is 80： 20, PPys with nanofibrils are dispersed homogenously in/on the exfoliated layer of GO and the conductivity is enhanced. The capacitance utilization of PPy in a composite with a GO concentration of 80% （383 F/g） is higher than that of pure PPy （201 F/g）, which indicates the presence of a synergistic effect between GO and PPy.

关 键 词：纳米复合材料 电化学性能 饲养比例 氧化石墨 结构 傅立叶变换红外光谱仪 扫描电子显微镜 透射电子显微镜 

分 类 号：TB383.1[一般工业技术—材料科学与工程]