石墨烯量子点增强聚吡咯超级电容器电极的电化学性质(英文)  

Graphene Quantum Dots Enhanced Electrochemical Performance of Polypyrrole as Supercapacitor Electrode

作　　者：吴坤[1] 许思哲[1] 周雪皎[1] 吴海霞[1] 

机构地区：[1]上海交通大学微纳科学技术研究院,上海200240

出　　处：《电化学》2013年第4期361-370,共10页Journal of Electrochemistry

基　　金：supported by the National Natural Science Foundation of China(No.20906055);National“973 Program”(No.2010CB933900);the State Key Laboratory of Bioreactor Engineering(No.2060204)

摘　　要：通过将吡咯单体在低温下与石墨烯量子点进行原位聚合,获得一种全新的聚吡咯/石墨烯量子点(PPY/GQD)复合材料.实验中采用了扫描电子显微镜(SEM)、原子力显微镜(AFM)、X射线衍射(XRD)、红外光谱(FT-IR)和热重分析(TGA)对复合物的表面形貌、结构进行表征.结果表明,吡咯单体以石墨烯量子点为软模板,以化学键的方式在石墨烯量子点的表面聚合生长成片状聚吡咯.通过机械冷压法将粉末状PPY/GQD复合物压成圆片电极.电极的电化学测试结果表明,PPY和GQD质量比为50:1所制得的复合物的电容量为485 F.g-1,同时在2000次循环之后电容量只降低了大约2%.通过与同比例的PG(聚吡咯/石墨烯复合材料)以及纯PPY对比,发现聚吡咯/石墨烯量子点的高比容量及优异的循环稳定性将会使其在电化学超级电容器领域中具有潜在的应用价值.With an objective to develop electrode materials with high specific capacitance and good stability, a completely new nanocomposite of Polypyrrole （PPY） and graphene quantum dots （GQD） was successfully obtained through in-situ polymerization of pyrrole in the presence of GQD suspension. The obtained composites with different mass ratios were characterized by X-ray diffraction（XRD）, Fourier transformed infrared spectroscopy（FT-IR） and scanning electron microscopy （SEM）. GQD enhanced electrochemical performance of PPY and, as supercapacitor electrodes, the PPY/GQD composites with the mass ratio of PPY to GQD at 50：1 showed a competitive specific capacitance of 485 F· g^-1 at a scan rate of 0.005 V ·s^-1. The attenuation of the specific capacitance is about 2% after 2000 cycles. The high specific capacitance and good stability of the PPY/GQD nanocomposites are promising for applications in electrochemical supercapacitors.

关 键 词：氧化石墨烯 石墨烯量子点 聚吡咯 超级电容器 

分 类 号：TM53[电气工程—电器] O631.3[理学—高分子化学]