Hollow shell-in-shell Ni3S4@Co9S8 tubes derived from core-shell Ni-MOF-74@Co-MOF-74 as efficient faradaic electrodes
Hollow shell-in-shell Ni3S4@Co9S8 tubes derived from core-shell Ni-MOF-74@Co-MOF-74 as efficient faradaic electrodes
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DOI：
10.1039/c7ce01873h
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发表时间：
2018-02-21
期刊：
影响因子：
3.1
通讯作者：
Wang, Jide
中科院分区：
文献类型：
--
作者：
Li, Hui;Yue, Fan;Wang, Jide
本文报道了一种新颖的壳中壳Ni3S4@Co9S8双层管（DST）分级结构的设计，以及随后的制备这些结构的尝试。我们通过在溶剂热条件下在Na 2S存在下从Ni-MOF-74@Co-MOF-74的同晶金属-有机骨架核-壳结构转变来制造这种独特的壳中壳分级结构。如此制备的Ni3S4@Co9S8 DST表现出高的比容量（在4 A g（-1）的电流密度下高达1257.4 F g（-1））和优异的充放电可逆性（在1000次循环后具有81.5%的容量保持率），其上级优于单壳Co 9 S8管的比容量（在1 A g（-1）下为337.8 F g（-1））。所制备的DST电极在20 A g（-1）的电流密度下的比容量也显示出优异的性能。在1 A g（-1）下，保留了获得的比容量值的约74.0%。这种方法是一种简便的方法，以生产新型的电极材料的能量存储设备和一个有用的自模板策略，用于制备多壳空心材料与不同的壳组成的不同的功能。
This paper reports the novel design of shell-in-shell Ni3S4@Co9S8 double-shelled tube (DST) hierarchical structures with different shell compositions, and the subsequent attempt to fabricate these structures. We fabricated such unique shell-in-shell hierarchical structures through transition from isomorphic metal-organic framework core-shell structures of Ni-MOF-74@Co-MOF-74 in the presence of Na2S under solvothermal conditions. The as-prepared Ni3S4@Co9S8 DSTs demonstrated high specific capacity (up to 1257.4 F g(-1) at a current density of 4 A g(-1)) with excellent charge-discharge reversibility (with 81.5% capacity retention after 1000 cycles), which is superior to that of the single-shelled Co9S8 tubes (337.8 F g(-1) at 1 A g(-1)). The specific capacity of the prepared DST electrode also showed exceptional performance at a current density of 20 A g(-1). Approximately 74.0% of the obtained value of the specific capacity was retained at 1 A g(-1). This approach is a facile method to produce novel electrode materials for energy storage devices and a useful self-templated strategy for the preparation of multi-shelled hollow materials with different shell compositions for different functions.