WCU Program, Department of BIN Fusion Technology, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea.
Nanotechnology. 2011 Jul 22;22(29):295202. doi: 10.1088/0957-4484/22/29/295202. Epub 2011 Jun 17.
A unique nanoarchitecture has been established involving polypyrrole (PPy) and graphene nanosheets by in situ polymerization. The structural aspect of the nanocomposite has been determined by Raman spectroscopy. Atomic force microscopy reveals that the thickness of the synthesized graphene is ∼ 2 nm. The dispersion of the nanometer-sized PPy has been demonstrated through transmission electron microscopy and the electrochemical performance of the nanocomposite has been illustrated by cyclic voltammetry measurements. Graphene nanosheet serves as a support material for the electrochemical utilization of PPy and also provides the path for electron transfer. The specific capacitance value of the nanocomposite has been determined to be 267 F g(-1) at a scan rate of 100 mV s(-1) compared to 137 mV s(-1) for PPy, suggesting the possible use of the nanocomposite as a supercapacitor electrode. After 500 cycles, only 10% decrease in specific capacitance as compared to initial value justifies the improved electrochemical cyclic stability of the nanocomposite.
通过原位聚合，建立了一种独特的涉及聚吡咯（PPy）和石墨烯纳米片的纳米结构。通过拉曼光谱确定了纳米复合材料的结构方面。原子力显微镜显示合成石墨烯的厚度约为 2nm。通过透射电子显微镜证明了纳米级 PPy 的分散性，并通过循环伏安法测量说明了纳米复合材料的电化学性能。石墨烯纳米片作为 PPy 的电化学利用的支撑材料，并为电子转移提供了途径。纳米复合材料的比电容值在扫描速率为 100mV s(-1) 时为 267F g(-1)，而 PPy 为 137 mV s(-1)，这表明该纳米复合材料可用作超级电容器电极。与初始值相比，经过 500 次循环后，比电容仅下降 10%，证明了纳米复合材料电化学循环稳定性的提高。
