Synthesis of novel spherical Fe3O4@Ni3S2 composite as improved anode material for rechargeable nickel-iron batteries
Synthesis of novel spherical Fe3O4@Ni3S2 composite as improved anode material for rechargeable nickel-iron batteries
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新型球形 Fe3O4@Ni3S2 复合材料的合成作为改进的可充电镍铁电池负极材料
DOI：
10.1016/j.electacta.2017.04.104
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发表时间：
2017-06-20
影响因子：
6.6
通讯作者：
Li, Quanmin
中科院分区：
文献类型：
--
作者：
Li, Jing;Guo, Litan;Li, Quanmin
Fe3O4@Ni3S2微球作为一种新型碱性阳极材料，首次通过四步法制备成功。在该复合材料中，Ni3S2纳米颗粒被紧密包裹在Fe3O4微球表面。与纯Fe3O4和Fe3O4@NiO微球相比，Fe3O4@Ni3S2具有显著提高的高速率性能和增强的循环稳定性。在1200 mA g（-1）的高放电倍率下，Fe3O4@Ni3S2的比容量为481.2 mAh g(-1)，而纯Fe3O4的比容量为83.7 mAh g（-1）。在120 mA g（-1）下循环100次后，Fe3O4@Ni3S2的容量保持率为95.1%，而纯Fe3O4电极的容量保持率仅为52.5%。Fe3O4@Ni3S2良好的电化学性能主要归功于Ni3S2的有利影响。Ni3S2层作为有用的添加剂，显著有利于减少Fe (OH)(2)钝化层的形成，提高电子导电性，提高反应的可逆性，抑制碱性铁阳极的析氢反应。由于其优异的电化学性能，我们认为新型Fe3O4@Ni3S2复合材料有潜力成为碱性铁基电池负极材料的候选材料。(C) 2017 Elsevier Ltd.版权所有。
Fe3O4@Ni3S2 microspheres as a novel alkaline anode material have been successfully fabricated through a four-step process for the first time. In this composite, Ni3S2 nanoparticles are coated tightly on the surface of Fe3O4 microspheres. Compared with the pure Fe3O4 and Fe3O4@NiO microspheres, the proposed Fe3O4@Ni3S2 delivers a significantly improved high-rate performance and enhanced cycling stability. At a high discharge rate of 1200 mA g(-1), the specific capacity of the Fe3O4@Ni3S2 is similar to 481.2 mAh g(-1) in comparison with similar to 83.7 mAh g(-1) for the pure Fe3O4. After 100 cycles at 120 mA g(-1), the Fe3O4@Ni3S2 can achieve a capacity retention of 95.1%, while the value for the pure Fe3O4 electrode is only 52.5%. The favorable electrochemical performance of the Fe3O4@Ni3S2 is mainly attributed to the beneficial impact of Ni3S2. The Ni3S2 layer as a useful additive is significantly conducive to lessening the formation of Fe (OH)(2) passivation layer, enhancing the electronic conductivity, improving the reaction reversibility and suppressing the hydrogen evolution reaction of the alkaline iron anode. Owing to its outstanding electrochemical properties, we believe that the novel Fe3O4@Ni3S2 composite is potentially a promising candidate for anode material of alkaline iron-based batteries. (C) 2017 Elsevier Ltd. All rights reserved.