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High performance energy storage electrodes based on 3D Z-CoO/RGO nanostructures for supercapacitor applications

Author

Listed:
  • Zha, Xiaoting
  • Wu, Zhaokun
  • Cheng, Zhengfu
  • Yang, Wenyao
  • Li, Jie
  • Chen, Yan
  • He, Liu
  • Zhou, Enmin
  • Yang, Yajie

Abstract

In this paper, by precisely tuning the structure of composite, a 3D silkworm cocoon-like composite material based on reduced graphene oxide (RGO) and Z-CoO (with a ZIF-67 as precursor) are prepared through a in situ hydrothermal method. This Z-CoO/RGO nanocomposite exhibits a highly opened nanostructure and high conductive capability. The electrochemical performance reveals that an outstanding mass specific capacity (275 F g−1 at current density of 1 A g−1), which is much higher than the pure ZIF-67 with 2.7 F g−1, and excellent resistance characteristic are obtained due to the excellent synergistic effect between the MOFs and RGO. Moreover, a hybridized asymmetric supercapacitor with Z-CoO/RGO as anode and active carbon as cathode is constructed. The device shows ultra-low resistance (the equivalent-series resistance and the charge-transfer resistance are 1.13 Ω and 0.43 Ω, respectively) and stable cycle life about 1000 times is observed. This Z-CoO/RGO electrode also presents high current loading performance for possible high-power density type devices. Our work reveals that the straightforward hydrothermal treatment is a promising method for the preparation of dedicated MOFs complex nanostructure for high performance supercapacitor electrode applications.

Suggested Citation

  • Zha, Xiaoting & Wu, Zhaokun & Cheng, Zhengfu & Yang, Wenyao & Li, Jie & Chen, Yan & He, Liu & Zhou, Enmin & Yang, Yajie, 2021. "High performance energy storage electrodes based on 3D Z-CoO/RGO nanostructures for supercapacitor applications," Energy, Elsevier, vol. 220(C).
    • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328036
    DOI: 10.1016/j.energy.2020.119696
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    Cited by:

    1. Chen, Dongfang & Pan, Lyuming & Pei, Pucheng & Huang, Shangwei & Ren, Peng & Song, Xin, 2021. "Carbon-coated oxygen vacancies-rich Co3O4 nanoarrays grow on nickel foam as efficient bifunctional electrocatalysts for rechargeable zinc-air batteries," Energy, Elsevier, vol. 224(C).
    2. Liu, Hongwei & Wang, Yongzhen & Lv, Liang & Liu, Xiao & Wang, Ziqi & Liu, Jun, 2023. "Oxygen-enriched hierarchical porous carbons derived from lignite for high-performance supercapacitors," Energy, Elsevier, vol. 269(C).

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