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Dattakumar Mhamane, Anil Suryawanshi, Sreekuttan M. Unni, Chandrashekhar Rode, Sreekumar Kurungot and Satishchandra Ogale Hierarchically Nanoperforated Graphene as a High Performance Electrode Material for Ultracapacitors Small 9

Version of Record online: 18 APR 2013 | DOI: 10.1002/smll.201202670

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A high specific capacitance (Cs) value is obtained for a symmetric ultracapacitor (UC) cell in 1 M H2SO4 electrolyte by using hierarchically nanoperforated graphene nanosheets (HPGN) as an electrode material. Nanoperforations are introduced in graphene by simple stirring in silica nanoparticle dispersion followed by HF treatment. The HPGN is shown to deliver a remarkably high energy density (68.43 Wh kg−1) as compared to earlier reports for graphene-based materials.

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