Electrospinning of carbon-coated MoO2 nanofibers with enhanced lithium-storage properties
Electrospinning of carbon-coated MoO2 nanofibers with enhanced lithium-storage properties
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DOI：
10.1039/c1cp22184a
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Huang, Yunhui
中科院分区：
文献类型：
--
作者：
Luo, Wei;Hu, Xianluo;Huang, Yunhui
通过单喷嘴静电纺丝、空气稳定化、还原/碳化等可控工艺制备了新型碳包覆MoO2纳米纤维。它们由厚度接近3 nm的均匀碳质壳层和尺寸类似于20 nm的初级MoO2纳米团簇组成的分级核组成。重要的是，由这种独特的碳包覆MoO2纳米纤维制成的电极在100次循环中表现出高达762.7 mAHg(-1)的高度可逆容量。与无碳MoO2颗粒相比，具有纳米晶团簇和碳涂层的MoO2纳米纤维在电化学储锂性能方面有了实质性的改善。这可能得益于纳米杂化的协同效应，消除了重复的锂插入/提取反应中的体积效应，并保持了电连接的完整性。目前的合成策略有望被扩展到合成其他具有碳涂层的纳米氧化物，用于重要的能量储存和传输应用。
Novel carbon-coated MoO2 nanofibers have been fabricated through a controlled route based on single-nozzle electrospinning, air stabilization, and reduction/carbonization processes. They are composed of both a uniform carbonaceous shell of similar to 3 nm in thickness and a hierarchical core made of primary MoO2 nanocrystal clusters of similar to 20 nm in size. Importantly, the electrode made of such unique carbon-coated MoO2 nanofibers exhibits a highly reversible capacity as high as 762.7 mAh g(-1) over 100 cycles. In contrast to the carbon-free MoO2 particulates, the MoO2 nanofibers, featuring both nanocrystal clusters and carbon coating, reveal a substantial improvement in electrochemical lithium-storage performances. This might benefit from the synergistic effect of the nanohybridization, relieving the volume effect during the repeated lithium insertion/extraction reactions and maintaining electrical connective integrity. It is expected that the present synthetic strategy can be extended to synthesize other nanostructured oxides with carbon coating for important energy storage and transfer applications.