3D Mesoporous Hybrid NiCo2O4@graphene Nanoarchitectures as Electrode Materials for Supercapacitors with Enhanced Performances

RSC Publishing
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Journal Article
Journal of Materials Chemistry A, 2014, 2 pp. 8103 - 8109
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3D mesoporous hybrid NiCo2O4@graphene nanoarchitectures were successfully synthesized by a combination of freeze drying and hydrothermal reaction. Field-emission scanning electron microscopy (FESEM) and TEM analyses revealed that NiCo2O4@graphene nanostructures consist of a hierarchical mesoporous sheet-on-sheet nanoarchitecture with a high specific surface area of 194 m2 g-1. Ultrathin NiCo2O4 nanosheets, with a thickness of a few nanometers and mesopores ranging from 2 to 5 nm, were wrapped in graphene nanosheets and formed hybrid nanoarchitectures. When applied as electrode materials in supercapacitors, hybrid NiCo2O4@graphene nanosheets exhibited a high capacitance of 778 F g-1 at the current density of 1 A g-1, and an excellent cycling performance extending to 10000 cycles at the high current density of 10 A g-1.
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