In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 5, No. 1 ( 2015-07-01)
Abstract:
We report the synthesis of three dimensional (3D) NiCo 2 O 4 @NiCo 2 O 4 nanocactus arrays grown directly on a Ni current collector using a facile solution method followed by electrodeposition. They possess a unique 3D hierarchical core-shell structure with large surface area and dual-functionalities that can serve as electrodes for both supercapacitors (SCs) and lithium-ion batteries (LIBs). As the SC electrode, they deliver a remarkable specific capacitance of 1264 F g −1 at a current density of 2 A g −1 and ~93.4% of capacitance retention after 5000 cycles at 2 A g −1 . When used as the anode for LIBs, a high reversible capacity of 925 mA h g −1 is achieved at a rate of 120 mA g −1 with excellent cyclic stability and rate capability. The ameliorating features of the NiCo 2 O 4 core/shell structure grown directly on highly conductive Ni foam, such as hierarchical mesopores, numerous hairy needles and a large surface area, are responsible for the fast electron/ion transfer and large active sites which commonly contribute to the excellent electrochemical performance of both the SC and LIB electrodes.
Type of Medium:
Online Resource
ISSN:
2045-2322
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2015
detail.hit.zdb_id:
2615211-3
Permalink