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利用原位聚合制备了氧化石墨(graphite oxide,GO)/聚吡咯(polypyrrole,PPy)纳米复合材料(GPYs),探讨了吡咯与GO的投料比对GPYs的结构以及电化学性能的影响.利用傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及X-射线衍射(XRD)技术对复合材料的结构进行表征;利用循环伏安、恒电流充放电以及电化学阻抗技术测试复合材料的电化学性能.实验结果表明,当吡咯加入量较多时(GPYs20(吡咯/GO=80:20)与GPYs50(吡咯/GO=50:50))会导致复合材料中PPy和GO层的团聚,这会降低PPy在GPYs20与GPYs50中的比电容贡献值.当吡咯与GO的投料比低至20:80时,复合材料中具有纳米纤维状形貌的PPy均匀分散于脱落的GO层表面/层内,所得到GPYs80的导电性得以提高.PPy在GPYs80的比电容贡献值(383F/g)比纯PPy(201F/g)高,表明GO和PPy之间存在协同效应.
The graphite oxide (GO) / polypyrrole (PPy) nanocomposites (GPYs) were prepared by in-situ polymerization and the effect of the ratio of pyrrole to GO on the structure and electrochemical performance of GPYs was investigated. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques were used to characterize the structure of the composites. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical (GPYs20 (pyrrole / GO = 80:20) and GPYs50 (pyrrole / GO = 50:50)) resulted in the increase of PPy and PPy in the composites GO layer, which reduces the specific capacitance contribution of PPy in GPYs20 and GPYs50. When the charge ratio of pyrrole to GO is as low as 20:80, the PPy with nanofibrous morphology in the composite is uniformly dispersed in the exfoliated The conductivity of GPYs80 was improved in the GO layer / layer, and the specific capacitance contribution of PPy at GPYs80 (383F / g) was higher than that of pure PPy (201F / g), suggesting a synergistic effect between GO and PPy.