Nanocrystallization of Imidazolium Ionic Liquid in Carbon Nanotubes
Nanocrystallization of Imidazolium Ionic Liquid in Carbon Nanotubes
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DOI：
10.1021/acs.jpcc.5b09423
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发表时间：
2015-12
影响因子：
3.7
通讯作者：
T. Ohba;K. Hata;V. Chaban
中科院分区：
文献类型：
--
作者：
T. Ohba;K. Hata;V. Chaban
室温离子液体（ILs）作为通用溶剂、反应介质、气体清除剂和电解质，特别是在超级电容器中，已经引起了全世界相当大的兴趣。限制在纳米尺度腔内的ILs的行为对高性能电容器是必不可少的，但它还没有很好地理解。本文通过实验结构和振动分析，并辅以分子模拟，表征了1-乙基-3-甲基咪唑氯IL在小直径碳纳米管（CNTs）中的结构特性。IL不能很好地填充1nm的碳纳米管，并且所包含的IL具有与体中相似的局部结构。对于2和3nm直径的碳纳米管，观察到高度有序的阳离子网络与受限的振动运动相关。阴离子在碳纳米管内有序的阳离子网络中相对移动。刚性晶体阳离子网络和可移动的氯离子区分了受限IL的独特性质。
Room-temperature ionic liquids (ILs) have been of considerable worldwide interest as universal solvents, reaction media, gas scavengers, and electrolytes, particularly in supercapacitors. The behavior of ILs confined in nanoscale cavities is essential for high-performance capacitors, yet it is not well understood. Here, the structural properties of the 1-ethyl-3-methylimidazolium chloride IL confined in small diameter carbon nanotubes (CNTs) are characterized by experimental structural and vibrational analyses, complemented by molecular simulations. The IL poorly fills the 1 nm CNTs and the included IL possesses a similar local structure to that seen in the bulk. For 2 and 3 nm diameter CNTs, highly ordered cationic networks associated with restricted vibrational motion are observed. Anions are relatively mobile in the ordered cationic network within the CNTs. Rigid crystalline cationic networks and mobile chloride anions distinguish the unique properties of the confined IL.