کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10267319 459450 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Diffusion impedance and equivalent circuit of a multilayer film
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Diffusion impedance and equivalent circuit of a multilayer film
چکیده انگلیسی
The paper analyses the equivalent circuit corresponding to two consecutive planar diffusion layers of finite thickness (porous Warburg or O elements) present in an electrochemical system. This case often occurs in important systems, such as protective coatings or membranes, which are routinely studied using electrochemical impedance spectroscopy (EIS). Relations are obtained that connect the diffusion impedance of a multilayer to the impedances of individual layers and also take into account partitioning effects. It is shown that the equivalent circuit that correctly represents the total diffusion impedance (e.g., for use in EIS spectra fitting algorithms) consists of several O and T (bounded Warburg) elements connected in a complex way. Analysis of limiting cases shows that the low-frequency limiting behavior of a multilayer film may significantly differ from those of individual layers showing asymmetry and synergism. In particular, it is shown that a thin layer of solution between an electrode and a resistant film to be characterized may seriously interfere with the measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 7, Issue 9, September 2005, Pages 957-961
نویسندگان
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