Highly porous graphitic carbon and Ni 2 P 2 O 7 for a high performance aqueous hybrid supercapacitor
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Journal of Materials Chemistry A, ISSN: 2050-7488, Vol: 3, Issue: 43, Page: 21553-21561
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- Chemistry; Energy; Materials Science; HIGH-ENERGY DENSITY; ELECTROCHEMICAL CAPACITORS; ASYMMETRIC SUPERCAPACITORS; NICKEL-HYDROXIDE; SOLID-STATE; CONTROLLED FABRICATION; ULTRAHIGH CAPACITANCE; ELECTRODE MATERIAL; FACILE SYNTHESIS; CATHODE MATERIAL
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 mg). HPGC exhibited typical electrical double layer capacitor (EDLC) behavior with a high specific capacitance of 384 F gand good negative working potential (-1.0 V) in an aqueous electrolyte. On the other hand, NiPOwas synthesized by a simple co-precipitation technique and tested as a cathode material which delivered a maximum specific capacitance of 1893 F gat 2 A gcurrent density. The fabricated HPGCNiPOhybrid device displayed excellent cyclic stability up to 2000 cycles and delivered a maximum energy density of 65 W h kgat 800 W kgpower density in a Na-ion based aqueous electrolyte.