Fe2O3 Nanoneedles on Ultrafine Nickel Nanotube Arrays as Efficient Anode for High‐Performance Asymmetric Supercapacitors |
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| Authors: | Yang Li Jing Xu Tao Feng Qiaofeng Yao Jianping Xie Hui Xia |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China;2. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, China;3. Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Singapore, Singapore |
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| Abstract: | High performance of electrochemical energy storage devices depends on the smart structure engineering of electrodes, including the tailored nanoarchitectures of current collectors and subtle hybridization of active materials. To improve the anode supercapacitive performance of Fe2O3 for high‐voltage asymmetric supercapacitors, here, a hybrid core‐branch nanoarchitecture is proposed by integrating Fe2O3 nanoneedles on ultrafine Ni nanotube arrays (NiNTAs@Fe2O3 nanoneedles). The fabrication process employs a bottom‐up strategy via a modified template‐assisted method starting from ultrafine ZnO nanorod arrays, ensuring the formation of ultrafine Ni nanotube arrays with ultrathin tube walls. The novel developed NiNTAs@Fe2O3 nanoneedle electrode is demonstrated to be a highly capacitive anode (418.7 F g?1 at 10 mV s?1), matching well with the similarly built NiNTAs@MnO2 nanosheet cathode. Contributed by the efficient electron collection paths and short ion diffusion paths in the uniquely designed anode and cathode, the asymmetric supercapacitors exhibit an excellent maximum energy density of 34.1 Wh kg?1 at the power density of 3197.7 W kg?1 in aqueous electrolyte and 32.2 Wh kg?1 at the power density of 3199.5 W kg?1 in quasi‐solid‐state gel electrolyte. |
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| Keywords: | anodes asymmetric supercapacitors Fe2O3 nanoneedles structure engineering Ni nanotubes |
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