材料科学
二极管
恒相元件
离子键合
介电谱
等效电路
光电子学
奈奎斯特图
循环伏安法
分析化学(期刊)
电压
离子
电化学
电气工程
电极
化学
物理化学
色谱法
有机化学
工程类
作者
Evaldo B. Carneiro‐Neto,Zhongkai Li,Ernesto C. Pereira,Klaus Mathwig,Philip Fletcher,Frank Marken
标识
DOI:10.1021/acsami.3c08543
摘要
Ionic diode based devices or circuits can be applied, for example, in electroosmotic pumps or in desalination processes. Aquivion ionomer coated asymmetrically over a Teflon film (5 μm thickness) with a laser-drilled microhole (approximately 10 μm diameter) gives a cationic diode with a rectification ratio of typically 10–20 (measured in 0.01 M NaCl with ±0.3 V applied bias). Steady state voltammetry, chronoamperometry, and electrochemical impedance spectroscopy data are employed to characterize the ionic diode performance parameters. Next, a COMSOL 6.0 finite element model is employed to quantitatively assess/compare transient phenomena and to extract mechanistic information by comparison with experimental data. The experimental diode time constant and diode switching process associated with a distorted semicircle (with a typical diode switching frequency of 10 Hz) in the Nyquist plot are reproduced by computer simulation and rationalized in terms of microhole diffusion–migration times. Fundamental understanding and modeling of the ionic diode switching process can be exploited in the rational/optimized design of new improved devices.
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