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arXiv 1004.0507cond-mat.mtrl-sci
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电化学应变显微镜对离子扩散的局部探测:空间分辨率和信号形成机制

Local probing of ionic diffusion by electrochemical strain microscopy: spatial resolution and signal formation mechanisms

A. N. Morozovska, E. A. Eliseev, N. Balke, S. V. Kalinin

摘要:

电化学嵌入-脱嵌反应通常与主体化合物的摩尔体积的显著变化相关。离子电流和应变之间的这种强耦合支撑了电化学应变显微镜(ESM)中的图像形成机制,并允许局部探索尖端诱导的电化学过程。在这里,我们分析了ESM中的信号形成机制,并在频域和时域中开发操作的解析描述。ESM光谱模式进行了比较,经典的电化学方法,包括恒电位和恒电流间歇滴定(PITT和GITT),和电化学阻抗谱(EIS)。该分析说明了使用机电检测在亚10纳米水平上对锂离子动力学进行空间分辨研究的可行性。

英文摘要:

Electrochemical insertion-deintercalation reactions are typically associated with significant change of molar volume of the host compound. This strong coupling between ionic currents and strains underpins image formation mechanisms in electrochemical strain microscopy (ESM), and allows exploring the tip-induced electrochemical processes locally. Here we analyze the signal formation mechanism in ESM, and develop the analytical description of operation in frequency and time domains. The ESM spectroscopic modes are compared to classical electrochemical methods including potentiostatic and galvanostatic intermittent titration (PITT and GITT), and electrochemical impedance spectroscopy (EIS). This analysis illustrates the feasibility of spatially resolved studies of Li-ion dynamics on the sub-10 nanometer level using electromechanical detection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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