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Heteroepitaxial growth of ZnO nanosheet bands on ZnCo2O4 submicron rods toward high-performance Li ion battery electrodes |
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| Authors: | Chan Woo Lee Seung-Deok Seo Dong Wook Kim Sangbaek Park Kyoungsuk Jin Dong-Wan Kim Kug Sun Hong | |
| Affiliation: | 1311. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea 2311. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea 3311. Department of Material Science and Engineering, Ajou University, Suwon, 443-749, Korea 4311. Department of Chemistry, Northwestern University, 245 Sheridan Road, Evanston, IL, 60208, USA |
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| Abstract: | We report the direct synthesis of ZnCo2O4 and ZnO/ZnCo2O4 submicron rod arrays grown on Ni foil current collectors via an ammonia-evaporation-induced method by controlling the ratio of Zn to Co. These three-dimensional (3D) hierarchical self-supported nanostructures are composed of one-dimensional (1D) ZnCo2O4 rods and two-dimensional (2D) ZnO nanosheet bands perpendicular to the axis of the each ZnCo2O4 rod. We carefully deal with the heteroepitaxial growth mechanisms of hexagonal ZnO nanosheets from a crystallographic point of view. Furthermore, we demonstrate the ability of these high-surface-area ZnO/ZnCo2O4 heterostructured rods to enable improved electrolyte permeability and Li ion transfer, thereby enhancing their Li storage capability (～900 mA·h·g?1 at a rate of 45 mA·h·g?1) for Li ion battery electrodes.  | |
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