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通过原位聚合方法制备不同配比的聚吡咯/氧化石墨(PPy/GO)复合物,将其用NaBH4还原得到聚吡咯/还原氧化石墨烯(PPy/RGO)复合物,采用X射线衍射、红外光谱和场发射扫描电子显微镜(FESEM)对其结构和形貌进行物理表征。采用循环伏安、恒电流充放电和交流阻抗等电化学方法系统研究了所制备样品的电化学性能。实验结果表明,在电流密度为0.5 A/g、吡咯(Py)与GO质量比为95∶5时,得到的复合物还原前后比电容分别可达401.5和314.5 F/g,远高于单纯的GO(34.8 F/g)和PPy(267.5 F/g)。经过1200圈循环稳定性测试后,PPy/RGO复合物比电容保持了原来的62.5%,与PPy和PPy/GO(电容保持率分别为16.8%和46.4%)相比,PPy/RGO表现出更好的循环稳定性能,有望成为超级电容器电极材料。
The polypyrrole / graphite oxide (PPy / GO) composites with different proportions were prepared by in-situ polymerization and the PPy / RGO complexes were reduced with NaBH4 to obtain the PPy / RGO composites. XRD, Spectroscopic and field emission scanning electron microscopy (FESEM) was used to characterize its structure and morphology. The electrochemical properties of the prepared samples were systematically investigated by electrochemical methods such as cyclic voltammetry, constant current charge and discharge and AC impedance. The experimental results show that the specific capacitance of the composite obtained before and after reduction is up to 401.5 and 314.5 F / g, respectively, at a current density of 0.5 A / g and a mass ratio of Py to GO of 95: 5, which is much higher than that of pure GO (34.8 F / g) and PPy (267.5 F / g). The PPy / RGO composite retained 62.5% of its specific capacitance after 1200 cycles of cycling stability, and PPy / RGO showed more performance compared to PPy and PPy / GO (capacitance retention of 16.8% and 46.4%, respectively) Good cycle stability, is expected to become super capacitor electrode material.