Graphene NanosheetNi2+Al3+ Layered Double-Hydroxide Composite as a Novel Electrode for a Supercapaci

• 作 者: Zan Gao Piaoping Yang MilinZhang Lianhe Liu Jun wang Zhanshuang Li Wanlu Yang Bin Wang Mengjie Hou Yang He Qi Liu Tom Mann
• 机 构: KeyLaboratoryofSuperlightMaterialandSurfaceTechnology,MinistryofEducation,HarbinEngineeringUniversit
• 出 处: 工信部七校青年学者论坛
• 发表日期: 2013年9期
• 关键词: graphene nanosheet layered double hydroxides composite electrode supercapacitor

　　A hybrid chemically converted graphene nanosheet/Ni2+/Al3+ layered double-hydroxide (GNS/LDH) composite for supercapacitor material has been fabricated by a hydrothermal method.Scanning electron microscopy and transmission electron microscopy results reveal that Ni2+/Al3+ LDH platelets homogeneously grew onto the surfaces of the GNSs as spacers to keep the neighboring sheets separate.Electrochemical properties were char acterized by cyclic voltammetry, galvanostatic charge/discharge measurements,and electrochemical impedance spectroscopy.The composite exhibits a max imum specific capacitance of 781.5 F/g and excellent cycle life with an increase of the specific capacitance of 38.07% after S0 cyde tests.Even after 200 cycle tests, the increase of the capacitance is 22.56% compared with the initial capacitance.