One-Pot Solvothermal Synthesis of ZnO@α-Co(OH)2 Core–Shell Hierarchical Microspheres with Superior Lithium Storage Properties
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- 作者：Yulin Bai ; Wenxiu Liu ; Chunhui Yu ; Ting Wang ; Jinkui Feng ; Shenglin Xiong
- 刊名：Journal of Physical Chemistry C
- 出版年：2016
- 出版时间：February 11, 2016
- 年：2016
- 卷：120
- 期：5
- 页码：2984-2992
- 全文大小：563K
- ISSN：1932-7455
文摘
ZnO and Co(OH)2 are significant functional materials that have been attracting immense interest in recent years because of their great potential application in various fields. Here, we developed a one-pot synthetic method to combine two materials into ZnO@α-Co(OH)2 core–shell hierarchical microspheres (CSHMSs) via the epitaxial growth of α-Co(OH)2 nanosheets on ZnO twin-hemispheres for the first time. By varying the volume ratio of N,N-dimethylformamide (DMF) to ethanol, uniform and well-defined CSHMSs were prepared. Additionally, the appropriate amount of polyvinylpyrrolidone (PVP) with certain molecular weight and the synergistic effect of different anions of precursors were found to be crucial to the formation of ZnO@α-Co(OH)2 CSHMSs. Compared with the bare ZnO twin-hemispheres, these CSHMSs indicated enhanced electrochemical activity, including high reversible capacity, excellent cycling stability, and rate performance, when examined as anodes for lithium-ion batteries. The remarkable electrochemical performance of the CSHMSs is attributed to their unique hierarchical micro/nanostructure, the synergistic effect, and the interface effect of bicomponent active materials.