%0 Journal Article
%A Sankar, Kalimuthu Vijaya
%A Seo, Youngho
%A Lee, Su Chan
%A Jun, Seong Chan
%D 2018
%T Redox
Additive-Improved Electrochemically and Structurally Robust Binder-Free
Nickel Pyrophosphate Nanorods as Superior Cathode for Hybrid Supercapacitors
%U https://acs.figshare.com/articles/journal_contribution/Redox_Additive-Improved_Electrochemically_and_Structurally_Robust_Binder-Free_Nickel_Pyrophosphate_Nanorods_as_Superior_Cathode_for_Hybrid_Supercapacitors/5926276
%R 10.1021/acsami.7b19357.s001
%2 https://acs.figshare.com/ndownloader/files/10592707
%K N-doped
%K electrolyte
%K battery-type nickel pyrophosphate
%K battery-type redox additive
%K nickel pyrophosphate 1 D nanorods
%K charge storage capacity
%K graphene oxide
%K supercapacitor
%K cm
%K capacitance
%K life
%K power density
%K Redox Additive-Improved Electrochemically
%K anode
%K performance
%K material
%K Structurally Robust Binder-Free Nickel Pyrophosphate Nanorods
%K kg
%K 75 mg K 3
%K 1 M KOH
%X For 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.
%I ACS Publications