Monolayer graphene/NiO nanosheets with two-dimension structure for supercapacitors

• DOI: 10.1039/c1jm13016a
• Publication Date: 2011-10-25T08:46:11Z
• Authors: Bing Zhao; Jinsong Song; Peng Liu; Weiwen Xu; Tao Fang; Zheng Jiao; Haijiao Zhang; Yong Jiang
• Keywords: Non-blocking I/O; Specific surface area

In this paper, graphene oxide (GO) synthesized from the modified Hummer method is used directly to fabricate unique two-dimension graphene/NiO composite material. Nickel ions are adsorbed on both sides of GO based self-assembly by electrostatic interactions two species, forming monolayer sheet. The as-prepared characterized using X-ray diffraction (XRD), Raman, SEM, TEM, Energy Dispersive Spectrometer (EDS) analysis and nitrogen adsorption/desorption. results demonstrate that NiO nanoparticles (5–7 nm) uniformly dispersed surface graphene, which greatly increases area (134.5 m2 g−1). This two-dimensional structure enhances supercapacitive performance with a high specific capacitance 525 F g−1 at current density 200 mA g−1. A capacity retention 95.4% can be maintained after 1000 cycles, suggesting its promising potential in supercapacitors.