材料科学
纳米线
异质结
外延
纳米技术
电解质
纳米棒
阳极
透射电子显微镜
锂(药物)
支化(高分子化学)
化学工程
光电子学
电极
复合材料
化学
物理化学
图层(电子)
内分泌学
工程类
医学
作者
Yuxin Zhao,Ying Zhang,Huahua Zhao,Xuejin Li,Yanpeng Li,Ling Wen,Yan Zhang,Ziyang Huo
出处
期刊:Nano Research
[Springer Nature]
日期:2015-08-01
卷期号:8 (8): 2763-2776
被引量:69
标识
DOI:10.1007/s12274-015-0783-1
摘要
The careful design of nano-architectures and smart hybridization of expected active materials can lead to more advanced properties. Here we have engineered a novel hierarchical branching Cu/Cu2O/CuO heteronanostructure by combining a facile hydrothermal method and subsequent controlled oxidation process. The fine structure and epitaxial relationship between the branches and backbone are investigated by high-resolution transmission electron microscopy. Moreover, the evolution of the branch growth has also been observed during the gradual oxidation of the Cu nanowire surface. The experimental results suggest that the surface oxidation needs to be performed via a two-step exposure process to varying humidity in order to achieve optimized formation of a core-shell structured branching architecture. Finally, a proof-of-concept of the function of such a hierarchical framework as the anode material in lithium-ion batteries is demonstrated. The branching core-shell heterostructure improves battery performance by several means: (i) The epitaxially grown branches provide a high surface area for enhanced electrolyte accessibility and high resistance to volume change induced by Li+ intercalation/extraction; (ii) the core-shell structure with its well-defined heterojunction increases the contact area which facilitates effective charge transport during lithiation; (iii) the copper core acts as a current collector as well as providing structural reinforcement.
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