NiTe2/N-doped graphitic carbon nanosheets derived from Ni-hexamine coordination frameworks for Na-ion storage
NiTe2/N-doped graphitic carbon nanosheets derived from Ni-hexamine coordination frameworks for Na-ion storage
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用于钠离子存储的 NiTe2/N 掺杂石墨碳纳米片源自 Ni-六胺配位框架
DOI：
10.1016/j.cej.2018.10.224
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发表时间：
2019-03
期刊：
影响因子：
--
通讯作者：
Jisheng Zhou
中科院分区：
文献类型：
--
作者：
Di;ing Sun;Sitong Liu;Guanjun Zhang;Jisheng Zhou
Metal-organic-frameworks (MOFs) have recently been an emerging self-templated precursor to derive various nanomaterials for Na-ion storage. However, synthesis of MOF-derived two-dimensional nanomaterials has been rarely explored. Here, Ni(NO3)2/hexamine coordination-frameworks are employed as a precursor to prepare NiTe2/nitrogen-doped graphitic carbon nanosheets (NiTe2@NCNs) via pyrolysis and subsequent tellurization. Layered NiTe2nanoparticles are uniformly anchored on the carbon nanosheets. As anode materials, NiTe2@NCNs exhibit ultrafast and long-life Na-ion storage performance. NiTe2@NCNs can deliver a reversible capacity of 289.5 mA h g−1at 0.1 A g−1and exhibit a negligible capacity fading with the increasing of current density from 0.1 to 10 A g−1. Even at 10 and 20 (ca. 70 C) A g−1, reversible capacities remain at 267.7 and 189.0 mA h g−1, respectively, and cyclic life can be up to 5000 cycles. Besides, NiTe2@NCNs exhibit minimal increasing of polarization from 0.1 to 5 A g−1. The superior electrochemical performance of NiTe2@NCNs should be attributed to the two-dimensional structure, N-doped graphitic carbon matrix and lager interlayer spacing of NiTe2, which contribute to enhance kinetics of electron and Na-ion transfer so as to result in a capacitive-controlled Na-ion storage process. Therefore, NiTe2@NCNs have a promising potential as anode materials for practical Na-ion storage applications.
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