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Amidation-Dominated Re-Assembly Strategy for Single-Atom Design/Nano-Engineering: Constructing Ni/S/C Nanotubes with Fast and Stable K-Storage |
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| Authors: | Dr Zheng Yi Song Jiang Dr Jie Tian Yong Qian Prof Shimou Chen Prof Shiqiang Wei Dr Ning Lin Prof Yitai Qian |
| Institution: | 1. Department of Applied Chemistry, Hefei National Laboratory for Physical Science at Micro-scale, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China
These authors contributed equally to this work.;2. Experimental Center of Engineering and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China;3. Department of Applied Chemistry, Hefei National Laboratory for Physical Science at Micro-scale, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China;4. Beijing Key Laboratory of Ionic Liquid Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 P. R. China;5. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China |
| Abstract: | An amidation-dominated re-assembly strategy is developed to prepare uniform single atom Ni/S/C nanotubes. In this re-assembly process, a single-atom design and nano-structured engineering are realized simultaneously. Both the NiO5 single-atom active centers and nanotube framework endow the Ni/S/C ternary composite with accelerated reaction kinetics for potassium-ion storage. Theoretical calculations and electrochemical studies prove that the atomically dispersed Ni could enhance the convention kinetics and decrease the decomposition energy barrier of the chemically-absorbed small-molecule sulfur in Ni/S/C nanotubes, thus lowering the electrode reaction overpotential and resistance remarkably. The mechanically stable nanotube framework could well accommodate the volume variation during potassiation/depotassiation process. As a result, a high K-storage capacity of 608 mAh g?1 at 100 mA g?1 and stable cycling capacity of 330.6 mAh g?1 at 1000 mA g?1 after 500 cycles are achieved. |
| Keywords: | Kalium-Ionen-Batterien Kinetik Nanoengineering Nickel-Einzelatome Niedermolekularer Schwefel |