Fe7Se8 nanoparticles encapsulated by nitrogen-doped carbon with high sodium storage performance and evolving redox reactions
Fe7Se8 nanoparticles encapsulated by nitrogen-doped carbon with high sodium storage performance and evolving redox reactions
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Fe7Se8 纳米粒子被氮掺杂碳封装，具有高钠存储性能和不断发展的氧化还原反应
DOI：
10.1016/j.ensm.2017.08.013
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发表时间：
2018-01-01
影响因子：
20.4
通讯作者：
Huang, Yunhui
中科院分区：
文献类型：
--
作者：
Wan, Min;Zeng, Rui;Huang, Yunhui
我们首次证明了Fe7Se8作为钠离子电池（SIB）的阳极的可用性。通过使用普鲁士蓝色作为前体的碳水化热方法制造了由氮掺杂碳层（Fe7se8@nc）封装的Fe7SE8纳米复合材料（Fe7se8@nc），其钠储存机制和循环过程中的非凡激活过程揭示了对其反应过程的全面理解。它表明，Fe7Se8的钠储存机制可能会受到激活过程的影响，尤其是在电荷过程中。作为SIB阳极材料，Fe7Se8@NC表现出出色的电化学性能，可逆排放能力为367 mAh G（-1），在500 mA g（-1）。即使在2000 mA g（-1），容量也可以保留251 mAh g（-1）。此外，FE7SE8@ NC显示出极好的环状性，在1200个周期后，可在1000 mA g（-1）处保持容量高达339 mAh g（-1）。结果表明（FESE8）-SE-7@NC是SIBS的有希望的阳极材料。
We demonstrate the availability of Fe7Se8 as anode for sodium-ion batteries (SIBs) for the first time. A Fe7Se8 nanocomposite encapsulated by nitrogen-doped carbon layers (Fe7Se8@NC) has been fabricated via a facile thermal method using Prussian Blue as precursor, and its sodium storage mechanisms and extraordinary activation process during cycling are revealed for comprehensive understanding of its reaction process. It shows that the sodium storage mechanisms of Fe7Se8 can be affected by the activation process, especially in the charge process. As SIB anode material, the Fe7Se8@NC exhibits an outstanding electrochemical performance with a reversible discharge capacity of 367 mAh g(-1) at 500 mA g(-1). Even at 2000 mA g(-1), the capacity can retain 251 mAh g(-1). Moreover, the Fe7Se8@ NC shows excellent cyclability, which maintains the capacity up to 339 mAh g(-1) at 1000 mA g(-1) after 1200 cycles. The results demonstrate that (FeSe8)-Se-7@NC is a promising anode material for SIBs.