%0 Journal Article
%T <br>
%A 周晓
%A 孙敏强
%A 王庚超
%J 物理化学学报
%D 2016
%R 10.3866/PKU.WHXB201601281
%X 采用γ射线辐照还原技术获得易分散石墨烯(GNS),并以其为载体,以樟脑磺酸为掺杂剂和软模板,借助化学氧化聚合方法制备出分级孔结构的石墨烯负载聚(1, 5-二氨基蒽醌)(GNS@PDAA)纳米复合材料。运用傅里叶变换红外(FTIR)光谱、拉曼光谱(Raman)、原子力显微镜(AFM)、能谱仪(EDS)、场发射扫描电镜(FE-SEM)和电化学测试等手段研究了不同GNS/DAA质量比对GNS@PDAA复合材料的形貌、结构及超级电容特性的影响。研究表明,当DAA/GNS质量比为6/1时,借助π-π堆叠和网络限域作用, PDAA以20-40 nm纳米颗粒的形式牢固沉积于石墨烯表面,材料内部存在大量10-30 nm尺寸的介孔。该GNS@PDAA复合材料在0.5 A·g-1时呈现最高的比电容(398.7 F·g-1),优异的倍率特性(在50 A·g-1下比电容保持率为71%)和非常好的循环性能(20000次循环后比电容损失仅为8.3%)。进而证实了GNS@PDAA复合材料所组装的超级电容器具有优异的串并联特性。<br>Well-dispersed graphene nanosheets (GNS) were prepared by the 60Co γ-ray irradiation reduction technique. On this basis, the hierarchical graphene nanosheet-supported poly(1, 5-diaminoanthraquinone) (GNS@PDAA) nanocomposites were synthesized by the chemically oxidative polymerization method using camphor sulfonic acid as both the dopant and soft template. The influence of the DAA/GNS mass ratios on the morphology, chemical structure, and supercapacitance performance for GNS@PDAA nanocomposites was investigated. The structure, morphology, and electrochemical properties of the composites were characterized by Fourier infrared spectroscopy (FTIR), Raman spectroscopy (Raman), atomic force microscope (AFM), energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM), and electrochemical measurements. The results show that for the GNS@PDAA nanocomposite with DAA/GNS mass ratio of 6/1, the PDAA nanoparticles (20-40 nm diameter) are evenly deposited on the surface of GNS, which intercalate a large number of mesopores with 10-30 nmthrough strong π-π stacking and network confinement. As a result, the GNS@PDAA exhibits the highest specific capacitance (398.7 F·g-1 at 0.5 A·g-1), excellent rate capability (71% capacitance retention at 50 A·g-1), and superior cycling stability (only 8.3% capacitance loss after 20000 cycles). Furthermore, based on the GNS@PDAA nanocomposites as both negative and positive electrodes, the as-assembled supercapacitors showed an excellent series/parallel connection effect in aqueous system
%U http://www.whxb.pku.edu.cn/CN/Y2016/V32/I4/975