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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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

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Title
Highly porous graphitic carbon and Ni2P2O7 for a high performance aqueous hybrid supercapacitor
Author
Senthilkumar, BaskarKhan, ZiyauddinPark, SeungyoungKim, KyounghoKo, HyunhyubKim, Youngsik
Keywords
HIGH-ENERGY DENSITY; ELECTROCHEMICAL CAPACITORS; ASYMMETRIC SUPERCAPACITORS; NICKEL-HYDROXIDE; SOLID-STATE; CONTROLLED FABRICATION; ULTRAHIGH CAPACITANCE; ELECTRODE MATERIAL; FACILE SYNTHESIS; CATHODE MATERIAL
Issue Date
201507
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.43, pp.21553 - 21561
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 HPGCNi2P2O7 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. © The Royal Society of Chemistry 2015
URI
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DOI
http://dx.doi.org/10.1039/c5ta04737d
ISSN
2050-7488
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