功能化石墨烯/聚苯胺复合电极材料的制备和电化学性能

利用水合肼还原十八胺（ODA）接枝的氧化石墨烯（GO），得到了十八胺功能化石墨烯（ODA-G），将ODAG与聚苯胺（PANI）通过溶液共混法，制备了功能化石墨烯和聚苯胺纳米复合材料（ODA-G/PANI）. 采用傅里叶变换红外（FTIR）光谱、X射线衍射（XRD）、热重分析（TGA）、拉曼（Raman）光谱及透射电镜（TEM），对复合材料的结构和形貌进行了表征；利用循环伏安、恒流充放电及交流阻抗谱等，对复合材料的电化学性能进行了测试. 结果显示，少量ODA-G的引入为PANI 的电化学氧化还原反应提供了更多的电子通道和活性位置，有利于提高PANI 的赝电容. 在电流密度1.0 A·g^-1下，2%（w）ODA-G/PANI 的比电容达到787 F·g^-1，而相应的PANI 仅有426 F·g^-1. 此外，ODA-G/PANI的循环稳定性也远高于纯PANI.

Preparation and Electrochemical Properties of Functionalized Graphene/Polyaniline Composite Electrode Materials

Octadecylamine functionalized graphene (ODA-G) was synthesized by the grafting of graphene oxide (GO) with ODA followed by reduction with hydrazine hydrate. Subsequently, ODA-G/polyaniline (PANI) composites were prepared using a facile solvent-blending procedure. ODA-G and ODA-G/PANI composites were characterized by Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman spectroscopy, and transmission electron microscopy (TEM). The electrochemical properties of the composites were measured based on cyclic voltammetry (CV), galvanostatic charge/discharge, and ac impedance spectroscopy. The results show that ODA-G as a support material provides additional electron transfer paths, as well as active sites, for the electrochemical redox reaction of PANI, which helps to increase its pseudocapacitance. A specific capacitance of 782 F·g^-1 is obtained for 2%(w)ODA-G/PANI at a current density of 1.0 A·g^-1, compared with 426 F·g^-1 for PANI. Furthermore, ODA-G/PANI exhibits better stability than PANI.