Citation: WANG Li-Li, XING Rui-Guang, ZHANG Bang-Wen, HOU Yuan. Preparation and Electrochemical Properties of Functionalized Graphene/Polyaniline Composite Electrode Materials[J]. Acta Physico-Chimica Sinica, 2014, 30(9): 1659-1666. doi: 10.3866/PKU.WHXB201406162
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( ),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.
English
Preparation and Electrochemical Properties of Functionalized Graphene/Polyaniline Composite Electrode Materials
Octadecylamine functionalized graphene (ODA-G) was synthesized by the grafting of graphene oxide ( ) 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.
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Key words:
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Functionalized graphene
- / Polyaniline
- / Supercapacitor
- / Electrochemical property
- / Solvent-blending
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