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Issue 43, 2015
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Highly porous graphitic carbon and Ni2P2O7 for a high performance aqueous hybrid supercapacitor

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Abstract

An aqueous Na-ion based hybrid capacitor has been successfully developed by using highly porous graphitic carbon (HPGC) derived from waste writing paper and a new electrode material as a negative and positive electrode, respectively. HPGC was prepared via hydrothermal carbonization and subsequent KOH activation of waste writing paper which showed a highly porous stacked sheet-like morphology with an exceptionally high BET specific surface area (1254 m2 g−1). HPGC exhibited typical electrical double layer capacitor (EDLC) behavior with a high specific capacitance of 384 F g−1 and good negative working potential (−1.0 V) in an aqueous electrolyte. On the other hand, Ni2P2O7 was synthesized by a simple co-precipitation technique and tested as a cathode material which delivered a maximum specific capacitance of 1893 F g−1 at 2 A g−1 current density. The fabricated HPGC‖Ni2P2O7 hybrid device displayed excellent cyclic stability up to 2000 cycles and delivered a maximum energy density of 65 W h kg−1 at 800 W kg−1 power density in a Na-ion based aqueous electrolyte.

Graphical abstract: Highly porous graphitic carbon and Ni2P2O7 for a high performance aqueous hybrid supercapacitor

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Article information


Submitted
26 Jun 2015
Accepted
28 Jul 2015
First published
29 Jul 2015

J. Mater. Chem. A, 2015,3, 21553-21561
Article type
Paper
Author version available

Highly porous graphitic carbon and Ni2P2O7 for a high performance aqueous hybrid supercapacitor

B. Senthilkumar, Z. Khan, S. Park, K. Kim, H. Ko and Y. Kim, J. Mater. Chem. A, 2015, 3, 21553
DOI: 10.1039/C5TA04737D

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