A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes |
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| Authors: | Wenyao Li Bingjie Zhang Runjia Lin SocMan Ho‐Kimura Guanjie He Xiying Zhou Junqing Hu Ivan P Parkin |
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| Affiliation: | 1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China;2. Shanghai Innovation Institute for Materials, Shanghai, China;3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China;4. Materials Chemistry Centre, Department of Chemistry, University College London, London, UK;5. Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, China |
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| Abstract: | A uniform dendritic NiCo2S4@NiCo2S4 hierarchical nanostructure of width ≈100 nm is successfully designed and synthesized. From kinetic analysis of the electrochemical reactions, those electrodes function in rechargeable alkaline batteries (RABs). The dendritic structure exhibited by the electrodes has a high discharge‐specific capacity of 4.43 mAh cm?2 at a high current density of 240 mA cm?2 with a good rate capability of 70.1% after increasing the current densities from 40 to 240 mA cm?2. At low scan rate of 0.5 mV s?1 in cyclic voltammetry test, the semidiffusion controlled electrochemical reaction contributes ≈92% of the total capacity, this value decreases to ≈43% at a high scan rate of 20 mV s?1. These results enable a detailed analysis of the reaction mechanism for RABs and suggest design concepts for new electrode materials. |
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| Keywords: | dendritic nanostructures kinetic analysis nickel cobalt sulfides rechargeable alkaline batteries |
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