聚吡咯/还原氧化石墨烯复合物的合成及电容性能

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0.5A/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314.5F/g,远高于单纯的GO(34.8F/g)和Ppy(267.5F/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.

Synthesis of Polypyrrole/Reduced Graphene Oxide and Its Capacitive Properties

Polypyrrole/graphite oxide composites(PPy/GO) with different mass ratios were first prepared by in situ polymerization and then reduced by NaBH4 to form polypyrrole/reduced graphene oxide(PPy/RGO).The morphology and structure of the composites were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR) and field emission scanning electron microscopy(FESEM).The electrochemical performances of the composites were investigated by cyclic voltammetry,galvanostatic charge discharge and electrochemical impedance techniques.The experimental results showed that the composites with the mass ratio of Py to GO up to 95∶ 5 reached the specific capacitances of 401.5 and 314.5 F/g before and after reduction at the current density of 0.5 A/g,respectively,which were much higher in comparison with pristine GO(34.8 F/g) and PPy(267.5 F/g).The capacitance retention is about 62.5% for PPy/RGO after 1200 cycles,which is much better than those of 16.8% for PPy and 46.4% for PPy/GO,indicating that the PPy/RGO has a high cycle stability and potential as electrode material for supercapacitors.