Morphology Controlled Synthesis of Nickel-Tin Oxide/Nitrogen Doped Reduced Graphene Oxide Composite with Ultrahigh Specific Capacitance for Asymmetric Supercapacitor Device
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Media type:
E-Book
Title:
Morphology Controlled Synthesis of Nickel-Tin Oxide/Nitrogen Doped Reduced Graphene Oxide Composite with Ultrahigh Specific Capacitance for Asymmetric Supercapacitor Device
Description:
Nickel-tin oxide/Nitrogen doped reduced graphene oxide was successfully prepared through hydrothermal method. The morphology evolution was investigated from nanopores to nanoflakes by controlling the Ni:Sn ratio in the initial precursor. Highest specific capacitance of ~1650 F g-1 at 3 A g-1 was achieved for the optimized composite (Ni:Sn=1:1) with nanoflakes morphology. Superior electrochemical activity of the optimized composite was properly investigated by XRD and XPS analysis. Asymmetric supercapacitor (ASC) device was fabricated with this optimized composite as positive electrode and sonically reduced graphene oxide as the negative electrode to demonstrate its practical application. The ASC exhibited maximum energy density of ~38.41 W h kg-1 at a power density of 2026 W kg-1. The fabricated device can retain ~91% of its initial capacitance after continuous 5000 GCD cycles. Two ASC devices connected in series lighting up a red LED indicator of 1.8 V