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

  • Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
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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.

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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.

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Authors and Affiliations

  1. The State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, 210009, Nanjing, China

    Yunhui Qi, Rui Zhu, Jun Xie, Yali Luo, Yunfei Liu & Yinong Lyu

  2. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, China

    Yunhui Qi, Rui Zhu, Jun Xie, Yali Luo, Yunfei Liu & Yinong Lyu

  3. Coliaborative Innovation Center of Jiangsu Advanced Bioligical and Chemical Manufacturing (SICAM), Nanjing, China

    Yunhui Qi, Rui Zhu, Jun Xie, Yali Luo, Yunfei Liu & Yinong Lyu

Authors
  1. Yunhui Qi
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  2. Rui Zhu
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  3. Jun Xie
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  4. Yali Luo
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  5. Yunfei Liu
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Correspondence to Yunfei Liu or Yinong Lyu.

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Qi, Y., Zhu, R., Xie, J. et al. Co3O4 nanocrystals grown on graphene nanosheets for high-performance supercapacitor with excellent rate capability. J Sol-Gel Sci Technol 89, 634–640 (2019). https://doi.org/10.1007/s10971-019-04921-8

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  • DOI: https://doi.org/10.1007/s10971-019-04921-8

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