Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 794, Issue -, Pages 255-260Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.04.273
Keywords
Free-standing; Fe2O3; NiO; Nanotube arrays; Asymmetric supercapacitor
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Funding
- National Natural Science Foundation of China [51575135, 51622503, U1537206, 51621091]
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Rational design and fabrication of advanced electrodes with tailored functionality is of great significance for high-performance asymmetric supercapacitors. Herein, we report the preparation of Fe2O3 nanotube arrays and core-branch NiO nanotube arrays directly on carbon paper by using ZnO nanorods as sacrificial templates via similar synthesis process, which works anode and cathode electrodes for the asymmetric supercapacitors. Benefiting from the free-standing nanotube nanostructures, a large number of surface active sites and fast ion diffusion paths, the Fe2O3 and NiO electrodes could achieve the high capacity up to 81.9 mAh g(-1) and 119.7 mAh g(-1), respectively. Further, an asymmetric supercapacitor is also assembled by using Fe2O3 as anode and NiO as cathode, which shows a high energy density of 48Wh kg(-1) at the power density of 2089 W kg(-1). Current research may put a general route for constructing high-performance anode and cathode materials in energy storage devices. (c) 2019 Elsevier B.V. All rights reserved.
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