Well-defined flake-like polypyrrole grafted graphene nanosheets composites as electrode materials for supercapacitors with enhanced cycling stability

作者：Wang, Xue; Wang, Tingmei; Yang, Chao; Li, Haidong; Liu, Peng^*

来源：Applied Surface Science, 2013, 287: 242-251.

DOI：10.1016/j.apsusc.2013.09.134

• Polypyrrole
• Graphene
• Composites
• Grafting polymerization
• Electrochemical property

Well-defined flake-like polypyrrole grafted graphene nanosheets composites (PPy-g-GNS) were fabricated by the in-situ chemical oxidative grafting polymerization of pyrrole in the presence of the 4-aminophenyl modified graphene nanosheets (AP-GNS), which were prepared via the coupling reaction of the graphene nanosheets (GNS) with diazonium salt. The flake-like PPy-g-GNS composite showed the high conductivity at room temperature. A maximum discharge capacitance of 191.2 F/g at the scan rate of 10 mV/s could be achieved in the three-electrode cell electrochemical testing in 1.0 mol/L NaNO3 electrolyte solution. It is higher than those of the AP-GNS, pure PPy, and the GNS/PPy composite prepared with the unmodified graphene nanosheets (GNS). The flake-like PPy-g-GNS composites also exhibited the excellent electrochemical stability even after 1000 cycles. It revealed the synergistic effect between the conducting polymer and the carbon-based support.

• 出版日期2013-12-15
• 单位中国科学院; 兰州大学; 桂林理工大学; 固体润滑国家重点实验室; 中国科学院兰州化学物理研究所; 功能有机分子化学国家重点实验室