Journal of Materials Chemistry · 2011 · 333 citations · 32 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemical EngineeringEnergy MaterialsNanomaterialsElectrode MaterialsMetal Oxide NanomaterialsNanocompositesNanoenergy MaterialsNanomaterial CharacterizationSupercapacitorsCapacitanceComposite Electrode MaterialsCurrent DensityElectrostatic InteractionsNanoparticlesSurface AreaSurface Area CharacterizationX-ray Diffraction Analysis
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 on self-assembly by the electrostatic interactions of two species, forming the monolayer graphene/NiO sheet. The as-prepared composite is characterized using X-ray diffraction (XRD), Raman, SEM, TEM, Energy Dispersive Spectrometer (EDS) analysis and nitrogen adsorption/desorption. The results demonstrate that the NiO nanoparticles (5–7 nm) is uniformly dispersed on the surface of graphene, which greatly increases the surface area of the composite (134.5 m2 g−1). This two-dimensional structure enhances supercapacitive performance with a high specific capacitance of 525 F g−1 at a current density of 200 mA g−1. A capacity retention of 95.4% can be maintained after 1000 cycles, suggesting its promising potential in supercapacitors.
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Materials for electrochemical capacitors
Patrice Simon, Yury Gogotsi · Nature Materials · 2008 · 16.1K citations
Natural Sciences, Materials Engineering, Materials Science +12
Graphene-based composite materials
Sasha Stankovich, Dmitriy A. Dikin, Geoffrey Dommett et al. · Nature · 2006 · 12.8K citations