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Nanostructured (Co, Ni)-Based Compounds Coated on a Highly Conductive Three Dimensional Hollow Carbon Nanorod Array (HCNA) Scaffold for High Performance Pseudocapacitors
journal contribution
posted on 2014-05-28, 00:00 authored by Lian Wan, Junwu Xiao, Fei Xiao, Shuai WangThe electrochemical performance of
the pseudocapacitive materials is seriously limited by poor electron
and ions transport. Herein, an advanced integrated electrode has been
designed by growing the pseudocapacitive materials, including CoxNi1–x(OH)2, CoxNi1–xO, and (CoxNi1–x)9S8, on a three-dimensional
hollow carbon nanorod arrays (HCNA) scaffold. The HCNA scaffold not
only can provide large surface area for increasing the mass loading
of the pseudocapacitive materials, but also is with good electrical
conductivity and hollow structure for facilitating fast electron and
electrolyte ions transport, and thus improve the electrochemical performance.
Particularly, in comparison with CoxNi1–x(OH)2 and CoxNi1–xO nanosheets,
(CoxNi1–x)9S8 nanosheets on the HCNA scaffold
exhibit better electrochemical performance. The discharge areal capacitance
of the (CoxNi1–x)9S8/HCNA electrode can be achieved to
1.32 F cm–2 at 1 mA cm–2, ∼1.5
times as that of the CoxNi1–x(OH)2/HCNA electrode. The rate capability
performance is also improved. 71.8% of the capacitance is retained
with increasing the discharge current density from 1 to 10 mA cm–2, in contrast to ∼59.9% for the CoxNi1–x(OH)2/HCNA electrode. Remarkably, the cycling stability is significantly
enhanced. ∼111.2% of the initial capacitance is gained instead
of decaying after the 3000 cycles at 8 mA cm–2,
while there is ∼11.5% loss for the CoxNi1–x(OH)2/HCNA
electrode tested under the same condition. Such good electrochemical
performance can be ascribed by that (CoxNi1–x)9S8 exhibits the similar energy storage mechanism as CoxNi1–x(OH)2 and CoxNi1–xO, and more importantly, is with better electrical
conductivity.
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Keywords
rate capability performancedischarge areal capacitanceenergy storage mechanismelectrodeHCNA scaffold exhibitCoxNielectrochemical performancecarbon nanorod arrayspseudocapacitive materialsDimensional Hollow Carbon Nanorod ArrayHigh Performance PseudocapacitorsThe electrochemical performanceelectrolyte ions transport