Complexing of NixMny sulfides microspheres via a facile solvothermal approach as advanced electrode materials with excellent charge storage performances |
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| Affiliation: | 1. State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China;2. Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, P.O. Box 81521, Aswan, Egypt;1. School of Civil and Architectural Engineering, Zhejiang University, Hangzhou 310058, China;2. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;3. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;1. State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China;2. Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, P.O. Box 81521, Aswan, Egypt;1. Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanivsky Street, Kyiv UA-03142, Ukraine;2. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;3. Nikolaev Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia;1. Institute for Composites Science Innovation (InCSI), School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;2. School of Civil and Architectural Engineering, Zhejiang University, Hangzhou, 310058, China |
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| Abstract: | Mixed metal sulfides with high specific capacitances and superior rate capabilities can meet the need of new materials for technological advancement of energy storage systems. We demonstrate in this study a facile fabrication of microspheres-like NixMny sulfides with different molar ratios of metallic salts through a one-step solvothermal route. The hierarchical NixMny sulfides-based compounds feature spherical architectures with relatively rough surfaces and assembled from ultrasmall and self-aggregated nanoprimary crystals. Especially, the NixMny sulfide (x/y = 1:1) presents an excellent battery-like performance with a high specific capacitance (219.4 mAh g?1 at current density of 1 A g?1) and a good rate capability (123 mAh g?1 at 50 A g?1), benefiting from the greatly improved faradaic redox processes boosted by the synergistic effect of Ni and Mn electroactive components and as well as fast mass transfer. Furthermore, the as-fabricated asymmetric supercapacitor based on NixMny sulfide (x/y = 1:1) presents a maximum energy density of 34 W h kg?1 at a power density of 868.1 W kg?1 with both superior rate and long-term cycling stabilities. In view of low cost and improved electrochemical performance, such integrated compound proposes a new and feasible pathway as a potential electrode configuration for energy storage devices. |
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| Keywords: | Microspheres-like architectures Chemical composition Rate capability High energy density asymmetric capacitors |
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