Ultrathin Mn Doped Ni-MOF Nanosheet Array for Highly Capacitive and Stable Asymmetric Supercapacitor |
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| Authors: | Dengchao Zheng Hao Wen Xun Sun Xin Guan Jie Zhang Wenli Tian Hao Feng Dr Hongjing Wang Prof Yadong Yao |
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| Institution: | 1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064 Sichuan, China;2. West China Second University Hospital, Sichuan University, Chengdu, 610065 Sichuan, China |
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| Abstract: | In this study, we demonstrate that an Mn-doped ultrathin Ni-MOF nanosheet array on nickel foam (Mn0.1-Ni-MOF/NF) serves as a highly capacitive and stable supercapacitor positive electrode. The Mn0.1-Ni-MOF/NF shows an areal capacity of 6.48 C cm?2 (specific capacity C: 1178 C g?1) at 2 mA cm?2 in 6.0 m KOH, outperforming most reported MOF-based materials. More importantly, it possesses excellent cycle stability to maintain 80.6 % capacity after 5000 cycles. An asymmetric supercapacitor device utilizing Mn0.1-Ni-MOF/NF as the positive electrode and activated carbon as the negative electrode attains a high energy density of 39.6 Wh kg?1 at 143.8 Wkg?1 power density with a capacitance retention of 83.6 % after 5000 cycles. |
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| Keywords: | asymmetric supercapacitors electrode materials highly-capacitive and stable LDH template ultrathin Ni-MOF nanosheet array |
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