Highly Porous Graphitic Carbon and Ni2P2O7 for High Performance Aqueous Hybrid Supercapacitor > Publication | UNIST YK RESEARCH

Publication

Publication

Highly Porous Graphitic Carbon and Ni2P2O7 for High Performance Aqueous Hybrid Supercapacitor
Author
Baskar Senthilkumar, Ziyauddin Khan, SeungyoungPark, Kyoungho Kim, Hyunhyub Ko and Youngsik Kim
Journal
Journal of Materials Chemistry A
Vol
3
Page
21553-21561
Year
2015
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.