Development of in situ electrochemical scanning electron microscopy with ionic liquids as electrolytes
Development of in situ electrochemical scanning electron microscopy with ionic liquids as electrolytes
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DOI：
10.1002/cphc.200700758
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发表时间：
2008-04-04
期刊：
影响因子：
2.9
通讯作者：
Kuwabata, Susumu
中科院分区：
文献类型：
--
作者：
Arimoto, Satoshi;Oyamatsu, Daisuke;Kuwabata, Susumu
我们报告，离子液体（ILs）可以通过电子显微镜观察到没有任何充电的液体。在此基础上，我们提出了一个在现场电化学扫描电子显微镜（在现场ECSEM）系统。实现原位ECSEM的关键技术是，即使IL位于绝缘光泽单元中，也可以通过用Pt线将IL接地来去除IL中的电荷。作为第一个演示，我们描述的氧化还原反应的聚吡咯（PPy）膜伴随着其厚度的变化时，它是由膜沉积的Pt电极在IL极化。此外，能量色散X射线荧光（EDX）分析可以用于在IL中极化的电极。通过EDX的PPy在含有K+作为标记的IL中的组分分析，揭示了在PPy膜还原时电解质阳离子掺杂到PPy膜中，并且在氧化时阳离子从膜中脱掺杂。
We report that ionic liquids (ILs) can be observed by electron microscopy without any charging of the liquid. Based on this, we present an in situ electrochemical scanning electron microscopy (in situ ECSEM) system. The key technology that enables in situ ECSEM is that charges can be removed from an IL by grounding it with a Pt wire, even if the IL is in an insulating gloss cell. As a first demonstration, we describe the redox reaction of a polypyrrole (PPy) film accompanied by changes in its thickness when it is polarized by the film-deposited Pt electrode in the IL. Further more, energy-dispersive X-ray fluorescence (EDX) analysis can be employed for the electrode polarized in the IL. The component analysis by EDX of PPy in an IL containing K+ as a marker, reveals doping of electrolyte cations into the PPy film upon the latter's reduction and dedoping of cations from the film upon oxidation.