Hydrothermal Synthesis of ZnWO₄ Hierarchical Hexangular Microstars for Enhanced Lithium-Storage Properties

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• 作者：Nianxiang Shi ; Shenglin Xiong ; Fangfang Wu ; Jing Bai ; Yanting Chu ; Hongzhi Mao ; Jinkui Feng and Baojuan Xi
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：2017
• 期：3
• 页码：734-740
• 全文大小：3063K
• ISSN：1099-0682c

文摘

ZnWO₄ hierarchical hexangular microstars (HHMs) composed of crossed microplatelets were synthesized by a two-step hydrothermal reaction without using any surfactants. The homogeneous HHMs were characterized by TEM/SEM and XRD to reveal the structural features and crystallographic phase. On the basis of the analysis of the time-dependent evolution of ZnWO₄ HHMs, a mechanism of in-situ formation and crystallographic fusion, wherein the morphology, components, and phase changed, is proposed to explain the formation process of 3D hexagonal structures. Furthermore, calcined ZnWO₄ HHMs were evaluated as anode material for lithium-ion batteries, and exhibited better rate capabilities and cycling performance than the as-synthesized material. This can be attributed to the stabilized and highly crystalline structure as well as the synergic and interfacial effects between different metal ions, which relieve the volume change during the charge/discharge process and provide more active sites for lithium-ion storage. The synthetic method and growth mechanism could be applied to design and synthesize other hierarchical structures.