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Redox Additive-Improved Electrochemically and Structurally Robust Binder-Free Nickel Pyrophosphate Nanorods as Superior Cathode for Hybrid Supercapacitors
journal contribution
posted on 2018-02-20, 00:00 authored by Kalimuthu Vijaya Sankar, Youngho Seo, Su Chan Lee, Seong Chan JunFor several decades, one of the great
challenges for constructing a high-energy supercapacitor has been
designing electrode materials with high performance. Herein, we report
for the first time to our knowledge a novel hybrid supercapacitor
composed of battery-type nickel pyrophosphate one-dimensional (1D)
nanorods and capacitive-type N-doped reduced graphene oxide as the
cathode and anode, respectively, in an aqueous redox-added electrolyte.
More importantly, ex situ microscopic images of the nickel pyrophosphate
1D nanorods revealed that the presence of the battery-type redox additive
enhanced the charge storage capacity and cycling life as a result
of the microstructure stability. The nickel pyrophosphate 1D nanorods
exhibited their maximum specific capacitance (8120 mF cm–2 at 5 mV s–1) and energy density (0.22 mWh cm–2 at a power density of 1.375 mW cm–2) in 1 M KOH + 75 mg K3[Fe(CN)6] electrolyte.
On the other side, the N-doped reduced graphene oxide delivered an
excellent electrochemical performance, demonstrating that it was an
appropriate anode. A hybrid supercapacitor showed a high specific
capacitance (224 F g–1 at a current density of 1
A g–1) and high energy density (70 Wh kg–1 at a power density of 750 W kg–1), as well as
a long cycle life (a Coulombic efficiency of 96% over 5000 cycles),
which was a higher performance than most of those in recent reports.
Our results suggested that the materials and redox additive in this
novel design hold great promise for potential applications in a next-generation
hybrid supercapacitor.
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N-dopedelectrolytebattery-type nickel pyrophosphatebattery-type redox additivenickel pyrophosphate 1 D nanorodscharge storage capacitygraphene oxidesupercapacitorcmcapacitancelifepower densityRedox Additive-Improved ElectrochemicallyanodeperformancematerialStructurally Robust Binder-Free Nickel Pyrophosphate Nanorodskg75 mg K 31 M KOH
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