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Journal Articles Journal of Materials Chemistry A Year : 2015

Vertically aligned graphene nanosheets on silicon using an ionic liquid electrolyte: towards high performance on-chip micro-supercapacitors

Abstract

Vertically oriented graphene nanosheets were synthesized by an alternative and simple approach based on electron cyclotron resonance-plasma enhanced chemical vapor deposition (ECR-CVD) onto highly doped silicon substrates. The as-grown graphene electrodes were employed in a symmetric micro-supercapacitor using an aprotic ionic liquid [N-methyl-N-propylpyrrolidinium bis(trifluoromethyl-sulfonylimide); PYR13TFSI] as electrolyte. The device was able to deliver an outstanding specific capacitance value of 2 mF cm(-2), a power density value of 4 mW cm(-2) and an energy density value of 4 mu W h cm(-2) operating at a large and stable cell voltage of 4 V with a quasi-ideal capacitive behaviour. Moreover, the lifetime of the device exhibited a remarkable electrochemical stability retaining 80% of the initial capacitance after 150 000 galvanostatic charge-discharge cycles at a high current density of 1 mA cm(-2). This excellent electrochemical performance results from the obtained channel-based 3-D graphene network promoting rapid electrolyte ion-transport and short diffusion paths.
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Dates and versions

hal-01580614 , version 1 (01-09-2017)

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David Aradilla, Marc Delaunay, Saïd Sadki, Jean-Michel Gérard, Gérard Bidan. Vertically aligned graphene nanosheets on silicon using an ionic liquid electrolyte: towards high performance on-chip micro-supercapacitors. Journal of Materials Chemistry A, 2015, 3 (38), pp.19254-19262. ⟨10.1039/c5ta04578a⟩. ⟨hal-01580614⟩
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