Chemistry of Materials · 2012 · 784 citations · 38 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemistryEnergy MaterialsNanomaterialsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsEnergy StorageEnergy Storage MaterialsSupercapacitorsCapacitanceComposite Electrode MaterialsGrapheneGraphene CompositesHydrothermal SynthesisManganese OxidesNanorodsVoltammetry
Graphene/Mn 3 O 4 composites were prepared by a simple hydrothermal process from KMnO 4 using ethylene glycol as a reducing agent. Mn 3 O 4 nanorods of 100 nm to 1 μm length were observed to be well-dispersed on graphene sheets. To assess the properties of these materials for use in supercapacitors, cyclic voltammetry and galvanostatic charging–discharging measurements were performed. Graphene/Mn 3 O 4 composites could be charged and discharged faster and had higher capacitance than free Mn 3 O 4 nanorods. The capacitance of the composites was 100% retained after 10 000 cycles at a charging rate of 5 A/g.
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Natural Sciences, Materials Engineering, Materials Science +17