Hierarchical Core/Shell NiCo2O4@NiCo2O4 Nanocactus Arrays with Dual-functionalities for High Performance Supercapacitors and Li-ion Batteries.

Content Provider	Europe PMC
Author	Cheng, Jinbing Lu, Yang Qiu, Kangwen Yan, Hailong Xu, Jinyou Han, Lei Liu, Xianming Luo, Jingshan Kim, Jang-Kyo Luo, Yongsong
Copyright Year	2015
Abstract	We report the synthesis of three dimensional (3D) NiCo2O4@NiCo2O4 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 NiCo2O4 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.
Journal	Scientific Reports [Sci Rep]
Volume Number	5
DOI	10.1038/srep12099
PubMed Central reference number	PMC4487229
PubMed reference number	26131926
e-ISSN	20452322
Language	English
Publisher	Nature Publishing Group
Publisher Date	2015-07-01
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary