10.1021/acsami.7b05384.s001
Shude Liu
Shude
Liu
Kalimuthu Vijaya Sankar
Kalimuthu Vijaya
Sankar
Aniruddha Kundu
Aniruddha
Kundu
Ming Ma
Ming
Ma
Jang-Yeon Kwon
Jang-Yeon
Kwon
Seong Chan Jun
Seong Chan
Jun
Honeycomb-Like
Interconnected Network of Nickel Phosphide
Heteronanoparticles with Superior Electrochemical Performance for
Supercapacitors
American Chemical Society
2017
surface area
Ni x P y
electrode exhibits
surface-to-volume ratios
electrode material design
Nickel Phosphide Heteronanoparticles
Supercapacitors Transition-metal-based heteronanoparticles
supercapacitor electrode
rate capability
Superior Electrochemical Performance
electrochemical activity
electrode materials
as-synthesized Ni x P y
cycling stability
optimized Ni x P y
novel nanostructured Ni x P y
Honeycomb-Like Interconnected Network
kg
2017-06-08 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Honeycomb-Like_Interconnected_Network_of_Nickel_Phosphide_Heteronanoparticles_with_Superior_Electrochemical_Performance_for_Supercapacitors/5139166
Transition-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 Ni<sub>5</sub>P<sub>4</sub>–Ni<sub>2</sub>P (Ni<sub><i>x</i></sub>P<sub><i>y</i></sub>) nanosheets,
which are interleaved by large quantities of nanoparticles. The optimized
Ni<sub><i>x</i></sub>P<sub><i>y</i></sub> delivers
an ultrahigh specific capacity of 1272 C g<sup>–1</sup> at
a current density of 2 A g<sup>–1</sup>, high rate capability,
and stability. An asymmetric supercapacitor employing as-synthesized
Ni<sub><i>x</i></sub>P<sub><i>y</i></sub> as the
positive electrode and activated carbon as the negative electrode
exhibits significantly high power and energy densities (67.2 W h kg<sup>–1</sup> at 0.75 kW kg<sup>–1</sup>; 20.4 W h kg<sup>–1</sup> at 15 kW kg<sup>–1</sup>). These results demonstrate
that the novel nanostructured Ni<sub><i>x</i></sub>P<sub><i>y</i></sub> can be potentially applied in high-performance
supercapacitors.