NDLI: Fe<sub>2</sub>O<sub>3</sub>-decorated millimeter-long vertically aligned carbon nanotube arrays as advanced anode materials for asymmetric supercapacitors with high energy and power densities

Content Provider	Royal Society of Chemistry (RSC)
Author	Yan, Ya Zhan, Ke Yin, Tong Yang, Junhe Yin, Yaolong Zhang, Wenkang Cheng, Junye Li, Jianqiang Zhao, Bin
Copyright Year	2016
Abstract	Construction of high-energy density asymmetric supercapacitors is often hindered by unsatisfactory matching between the anode and cathode. Thus, it is crucial to develop composite anodes with high specific capacitance to match that of cathodes. In this work, a novel anode material with well-dispersed Fe2O3 decorated on vertically aligned carbon nanotubes has been synthesized by a facile two-step method, consisting of supercritical carbon dioxide (SCCO2) assisted impregnation and subsequent thermal annealing. Due to the advantageous nanostructure, the Fe2O3/VACNT composites exhibit a large specific capacitance of 248 F g−1 at 8 A g−1 in 2 M KOH between −1.2 and 0 V versus SCE. An asymmetric supercapacitor operating at 1.8 V is assembled using the Fe2O3/VACNTs as the anode and the NiO/VACNTs as the cathode in a 2 M KOH aqueous electrolyte. The NiO/VACNTs//Fe2O3/VACNT asymmetric supercapacitor achieves an extremely high energy density of 137.3 W h kg−1 at a power density of 2.1 kW kg−1, and still retains 102.2 W h kg−1 at the high power density of 39.3 kW kg−1. Moreover, it also shows an outstanding cycling stability with ∼89.2% capacitance retention after 5000 cycles. The facile and effective synthesis method, as well as the superior electrochemical performance of the Fe2O3/VACNT composites, pave a way for promising applications in high-performance energy storage.
Starting Page	19026
Ending Page	19036
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	48
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta07720j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Anode Cathode Capacitance Carbon nanotube Supercritical carbon dioxide Nucleic acid thermodynamics Nanostructure Supercapacitor Electrolyte Energy density Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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