Epitaxial Growth of Lattice-Mismatched Core-Shell TiO2@MoS2 for Enhanced Lithium-Ion Storage

详细信息    查看全文

• 作者：Rui Dai ; Anqi Zhang ; Zhichang Pan ; Abdullah M. Al-Enizi ; Ahmed A. Elzatahry ; Linfeng Hu and Gengfeng Zheng
• 刊名：Small
• 出版年：2016
• 出版时间：May 25, 2016
• 年：2016
• 卷：12
• 期：20
• 页码：2792-2799
• 全文大小：3003K
• ISSN：1613-6829

文摘

Core–shell structured nanohybrids are currently of significant interest due to their synergetic properties and enhanced performances. However, the restriction of lattice mismatch remains a severe obstacle for heterogrowth of various core–shells with two distinct crystal structures. Herein, a controlled synthesis of lattice-mismatched core–shell TiO₂@MoS₂ nano-onion heterostructures is successfully developed, using unilamellar Ti_0.87O₂ nanosheets as the starting material and the subsequent epitaxial growth of MoS₂ on TiO₂. The formation of these core–shell nano-onions is attributed to an amorphous layer-induced heterogrowth mechanism. The number of MoS₂ layers can be well tuned from few to over ten layers, enabling layer-dependent synergistic effects. The core–shell TiO₂@MoS₂ nano-onion heterostructures exhibit significantly enhanced energy storage performance as lithium-ion battery anodes. The approach has also been extended to other lattice-mismatched systems such as TiO₂@MoSe₂, thus suggesting a new strategy for the growth of well-designed lattice-mismatched core–shell structures.