Co3O4 nanocrystals grown on graphene nanosheets for high-performance supercapacitor with excellent rate capability
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Co3O4 nanocrystals grown on graphene nanosheets (GNSs) were synthesized through a facile microwave hydrothermal method. The morphological and crystalline changes of Co3O4 nanocrystals during the microwave hydrothermal treatment are characterized by FE-SEM and XRD. Different morphologies of Co3O4/GNSs are obtained by controlling the microwave hydrothermal temperatures and time. The particle-slice Co3O4/GNSs exhibits the specific capacitance of 736 F g−1 at a current density of 9 A g−1 and 659 F g−1 at a high current density of 32 A g−1 (~97% capacitance retention at 4.5 A g−1 and ~89% capacitance retention at 9 A g−1). Therefore, the anode material with high rate capability and excellent cycle stability could be promising for high-performance supercapacitor.
Graphene nanosheets anchored with different morphologies of Co3O4 nanocrystals were explored for supercapacitor application.
Microwave hydrothermal method was used to control the morphology of Co3O4.
Particle-slice Co3O4/GNSs owns high rate capability and good cycle stability because of its special structure.
KeywordsCo3O4 Graphene nanosheets Rate capability Supercapacitor
This work was supported by Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions. And the authors thank for Innovative Research Team in University (PCSIRT), IRT1146.
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Conflict of interest
The authors declare that they have no conflict of interest.
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