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Redox-additive electrolyte–driven enhancement of the electrochemical energy storage performance of asymmetric Co3O4//carbon nano-onions supercapacitors

Author

Listed:
  • Dhakal, Ganesh
  • Mohapatra, Debananda
  • Tamang, Tensangmu Lama
  • Lee, Moonyong
  • Lee, Yong Rok
  • Shim, Jae-Jin

Abstract

For efficient energy storage, Co3O4@nickel foam exhibiting a plate-like (p-Co3O4) and grass-like (g-Co3O4) nanostructure were prepared as binder-free supercapacitor electrode materials. The electrochemical performance of the electrodes was tested using a redox-additive electrolyte (RAE). The homogeneously grown grass-like nanostructure (g-Co3O4) exhibited superior electrochemical performance to those with the plates-like structure (p-Co3O4) in a KOH electrolyte. In addition, the electrochemical performance of g-Co3O4 was improved using an RAE in a 3 M KOH solution. Remarkably, the specific capacitance of g-Co3O4 (1560 F g−1) was increased to 6580 F g−1, approximately 4-fold just by varying the RAE concentration in KOH. Carbon nano-onion (CNO) in the form of multi-layer fullerene was introduced as a negative electrode material. Owing to the more favorable morphology and properties of CNO such as exohedral structure, small diameter, high electrical conductivity, and relatively easy aqueous media dispersion than activated carbon and graphene, the as-fabricated asymmetric Co3O4//CNO supercapacitor delivered a high energy density of 42.5 Wh kg−1 and a high power density of 12.8 kW kg−1.

Suggested Citation

  • Dhakal, Ganesh & Mohapatra, Debananda & Tamang, Tensangmu Lama & Lee, Moonyong & Lee, Yong Rok & Shim, Jae-Jin, 2021. "Redox-additive electrolyte–driven enhancement of the electrochemical energy storage performance of asymmetric Co3O4//carbon nano-onions supercapacitors," Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:energy:v:218:y:2021:i:c:s0360544220325433
    DOI: 10.1016/j.energy.2020.119436
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    References listed on IDEAS

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    1. Khalaj, Maryam & Sedghi, Arman & Miankushki, Hoda Nourmohammadi & Golkhatmi, Sanaz Zarabi, 2019. "Synthesis of novel graphene/Co3O4/polypyrrole ternary nanocomposites as electrochemically enhanced supercapacitor electrodes," Energy, Elsevier, vol. 188(C).
    2. Lamiel, Charmaine & Nguyen, Van Hoa & Hussain, Iftikhar & Shim, Jae-Jin, 2017. "Enhancement of electrochemical performance of nickel cobalt layered double hydroxide@nickel foam with potassium ferricyanide auxiliary electrolyte," Energy, Elsevier, vol. 140(P1), pages 901-911.
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    4. Mei, Junfeng & Fu, Wenbin & Zhang, Zemin & Jiang, Xiao & Bu, Han & Jiang, Changjun & Xie, Erqing & Han, Weihua, 2017. "Vertically-aligned Co3O4 nanowires interconnected with Co(OH)2 nanosheets as supercapacitor electrode," Energy, Elsevier, vol. 139(C), pages 1153-1158.
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    Cited by:

    1. Sun, Bingkang & Zhang, Xiaoyun & Fan, Xing & Wang, Ruiyu & Bai, Hongcun & Wei, Xianyong, 2022. "Interface modification based on MnO2@N-doped activated carbon composites for flexible solid-state asymmetric supercapacitors," Energy, Elsevier, vol. 249(C).
    2. Olabi, Abdul Ghani & Abbas, Qaisar & Al Makky, Ahmed & Abdelkareem, Mohammad Ali, 2022. "Supercapacitors as next generation energy storage devices: Properties and applications," Energy, Elsevier, vol. 248(C).

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