Hierarchically Nanoperforated Graphene as a High Performance Electrode Material for Ultracapacitors

Authors

  • Dattakumar Mhamane,

    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
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  • Anil Suryawanshi,

    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
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  • Sreekuttan M. Unni,

    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
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  • Chandrashekhar Rode,

    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
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  • Sreekumar Kurungot,

    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
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  • Satishchandra Ogale

    Corresponding author
    1. Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India
    • Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India & Network Institute of Solar Energy (CSIR-NISE), New Delhi, India.
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Abstract

High performance is reported for a symmetric ultracapacitor (UC) cell made up of hierarchically perforated graphene nanosheets (HPGN) as an electrode material with excellent values of energy density (68.43 Wh kg−1) and power density (36.31 kW kg−1). Perforations are incorporated in the graphite oxide (GO) and graphene system at room temperature by using silica nanoparticles as template. The symmetric HPGN-based UC cell exhibits excellent specific capacitance (Cs) of 492 F g−1 at 0.1 A g−1 and 200 F g−1 at 20 A g−1 in 1M H2SO4 electrolyte. This performance is further highlighted by galvanostatic charge–discharge study at 2 A g−1 over a large number (1000) of cycles exhibiting 93% retention of the initial Cs. These property features are far superior as compared to those of symmetric UC cells made up of only graphene nanosheets (GNs), i.e. graphene sheets without perforations. The latter exhibit Cs of only 158 F g−1 at 0.1 A g−1 and the cells is not stable at high current density.

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