Three‐Dimensional Co3O4@MnO2 Hierarchical Nanoneedle Arrays: Morphology Control and Electrochemical Energy Storage |
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| Authors: | Dezhi Kong Jingshan Luo Yanlong Wang Weina Ren Ting Yu Yongsong Luo Yaping Yang Chuanwei Cheng |
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| Affiliation: | 1. Shanghai Key Laboratory of Special Artificial, Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai, P. R. China;2. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore;3. Department of Physics & Electronic Engineering, Xinyang Normal University, Xinyang, P. R. China |
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| Abstract: | In this paper, a highly ordered three‐dimensional Co3O4@MnO2 hierarchical porous nanoneedle array on nickel foam is fabricated by a facile, stepwise hydrothermal approach. The morphologies evolution of Co3O4 and Co3O4@MnO2 nanostructures upon reaction times and growth temperature are investigated in detail. Moreover, the as‐prepared Co3O4@MnO2 hierarchical structures are investigated as anodes for both supercapacitors and Li‐ion batteries. When used for supercapacitors, excellent electrochemical performances such as high specific capacitances of 932.8 F g?1 at a scan rate of 10 mV s?1 and 1693.2 F g?1 at a current density of 1 A g?1 as well as long‐term cycling stability and high energy density (66.2 W h kg?1 at a power density of 0.25 kW kg?1), which are better than that of the individual component of Co3O4 nanoneedles and MnO2 nanosheets, are obtained. The Co3O4@MnO2 NAs are also tested as anode material for LIBs for the first time, which presents an improved performance with high reversible capacity of 1060 mA h g?1 at a rate of 120 mA g?1, good cycling stability, and rate capability. |
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| Keywords: | supercapacitors Li‐ion batteries herarchical structures three‐dimensional metal oxides |
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