High‐Performance Asymmetric Supercapacitors Based on Multilayer MnO2/Graphene Oxide Nanoflakes and Hierarchical Porous Carbon with Enhanced Cycling Stability |
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| Authors: | Yufeng Zhao Wei Ran Jing He Yizhong Huang Zhifeng Liu Wei Liu Yongfu Tang Long Zhang Dawei Gao Faming Gao |
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| Affiliation: | 1. Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao, China;2. School of Materials Science and Engineering, Nanyang Technological University, Singapore;3. Institute of materials Science and Engineering, the Ocean University of China, Qingdao, China |
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| Abstract: | In this work, MnO2/GO (graphene oxide) composites with novel multilayer nanoflake structure, and a carbon material derived from Artemia cyst shell with genetic 3D hierarchical porous structure (HPC), are prepared. An asymmetric supercapacitor has been fabricated using MnO2/GO as positive electrode and HPC as negative electrode material. Because of their unique structures, both MnO2/GO composites and HPC exhibit excellent electrochemical performances. The optimized asymmetric supercapacitor could be cycled reversibly in the high voltage range of 0–2 V in aqueous electrolyte, which exhibits maximum energy density of 46.7 Wh kg?1 at a power density of 100 W kg?1 and remains 18.9 Wh kg?1 at 2000 W kg?1. Additionally, such device also shows superior long cycle life along with ～100% capacitance retention after 1000 cycles and ～93% after 4000 cycles. |
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| Keywords: | carbon MnO2 composites electrochemical performance supercapacitors |
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