کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221170 463376 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical time-of-flight responses at double-band generator-collector devices under pulsed conditions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical time-of-flight responses at double-band generator-collector devices under pulsed conditions
چکیده انگلیسی

For a double-microelectrode device, the time required to a species generated at the first electrode to diffuse towards the second one and be collected is the time-of-flight tf. This time is related to the specific distance d   separating the two electrodes by equation d=KDtf, where D is the diffusion coefficient of the species and K a constant which depends on: (i) the geometry of the device, (ii) the type of experiment and (iii) the criterion used to evaluate the flight time. Electrochemical time-of-flight (ETOF) methods are often based on pulsed potential techniques and allow the diffusion coefficient of a generated species to be precisely evaluated. However, to be accurate, these methods require the knowledge of K. We report hereafter numerical simulations of ETOF responses as a function of geometrical parameters of the device and type of experiment performed. To be used under any given specific case values of K   can be determined considering zone diagrams based on kinetic limiting behaviors of the simulated responses. The validity of these calculations were tested successfully by performing experiments in aqueous solutions of Fe(CN)63- with ETOF measurements of Fe(CN)64-. This was achieved either in open solution or in a microchannel without convection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 593, Issues 1–2, 1 August 2006, Pages 194–202
نویسندگان
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