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Co3O4 nanocrystals grown on graphene nanosheets for high-performance supercapacitor with excellent rate capability

  • Yunhui Qi
  • Rui Zhu
  • Jun Xie
  • Yali Luo
  • Yunfei LiuEmail author
  • Yinong LyuEmail author
Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
  • 23 Downloads

Abstract

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.

Different morphologies of Co3O4 nanocrystals grown on commercial graphene nanosheets have been successfully prepared, particle-slice Co3O4/GNSs shows high specific capacitance with excellent rate capability and long cycle stability.

Highlights

  • 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.

Keywords

Co3O4 Graphene nanosheets Rate capability Supercapacitor 

Notes

Acknowledgements

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.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.The State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and EngineeringNanjing Tech UniversityNanjingChina
  2. 2.Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)NanjingChina
  3. 3.Coliaborative Innovation Center of Jiangsu Advanced Bioligical and Chemical Manufacturing (SICAM)NanjingChina

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