Unusual Formation of CoSe@carbon Nanoboxes, which have an Inhomogeneous Shell, for Efficient Lithium Storage
Unusual Formation of CoSe@carbon Nanoboxes, which have an Inhomogeneous Shell, for Efficient Lithium Storage
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DOI：
10.1002/anie.201603852
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发表时间：
2016-08-08
影响因子：
16.6
通讯作者：
Lou, Xiong Wen (David)
中科院分区：
文献类型：
--
作者：
Hu, Han;Zhang, Jintao;Lou, Xiong Wen (David)
具有定制壳结构的混合中空纳米结构对于电化学能量存储应用是有吸引力的。从金属有机框架（MOF）开始，我们展示了具有复杂壳结构的混合纳米盒的容易形成，其中富含CoSe的内壳紧密地限制在富含碳的外壳（表示为CoSe@碳纳米盒）内。该合成是通过在高温下操作钴基沸石咪唑骨架（ZIF-67）纳米立方体与Se粉末之间的模板接合反应来实现的。凭借结构和组成特征，这些独特的CoSe@碳纳米盒在高比容量、优异的倍率性能、优异的循环稳定性和高初始库仑效率方面表现出优异的锂存储性能。
Hybrid hollow nanostructures with tailored shell architectures are attractive for electrochemical energy storage applications. Starting with metal-organic frameworks (MOFs), we demonstrate a facile formation of hybrid nanoboxes with complex shell architecture where a CoSe-enriched inner shell is intimately confined within a carbon-enriched outer shell (denoted as CoSe@carbon nanoboxes). The synthesis is realized through manipulation of the templateengaged reaction between Co-based zeolitic imidazolate framework (ZIF-67) nanocubes and Se powder at elevated temperatures. By virtue of the structural and compositional features, these unique CoSe@carbon nanoboxes manifest excellent lithium-storage performance in terms of high specific capacity, exceptional rate capability, excellent cycling stability, and high initial Coulombic efficiency.