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Honeycomb-Like Interconnected Network of Nickel Phosphide Heteronanoparticles with Superior Electrochemical Performance for Supercapacitors
journal contribution
posted on 2017-06-08, 00:00 authored by Shude Liu, Kalimuthu Vijaya Sankar, Aniruddha Kundu, Ming Ma, Jang-Yeon Kwon, Seong Chan JunTransition-metal-based
heteronanoparticles are attracting extensive
attention in electrode material design for supercapacitors owing to
their large surface-to-volume ratios and inherent synergies of individual
components; however, they still suffer from limited interior capacity
and cycling stability due to simple geometric configurations, low
electrochemical activity of the surface, and poor structural integrity.
Developing an elaborate architecture that endows a larger surface
area, high conductivity, and mechanically robust structure is a pressing
need to tackle the existing challenges of electrode materials. This
work presents a supercapacitor electrode consisting of honeycomb-like
biphasic Ni5P4–Ni2P (NixPy) nanosheets,
which are interleaved by large quantities of nanoparticles. The optimized
NixPy delivers
an ultrahigh specific capacity of 1272 C g–1 at
a current density of 2 A g–1, high rate capability,
and stability. An asymmetric supercapacitor employing as-synthesized
NixPy as the
positive electrode and activated carbon as the negative electrode
exhibits significantly high power and energy densities (67.2 W h kg–1 at 0.75 kW kg–1; 20.4 W h kg–1 at 15 kW kg–1). These results demonstrate
that the novel nanostructured NixPy can be potentially applied in high-performance
supercapacitors.
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Keywords
surface areaNi x P yelectrode exhibitssurface-to-volume ratioselectrode material designNickel Phosphide HeteronanoparticlesSupercapacitors Transition-metal-based heteronanoparticlessupercapacitor electroderate capabilitySuperior Electrochemical Performanceelectrochemical activityelectrode materialsas-synthesized Ni x P ycycling stabilityoptimized Ni x P ynovel nanostructured Ni x P yHoneycomb-Like Interconnected Networkkg
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