کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
195193 459809 2007 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
First principles analytical prediction of the conductivity of Nafion membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
First principles analytical prediction of the conductivity of Nafion membranes
چکیده انگلیسی

A first principles model is developed to describe and predict the protonic conductivity of fully hydrated Nafion membranes and its peculiar non-linear dependence on membrane thickness, potential and PH2PH2. The model focuses on the surface migration of protons between adjacent sulfonate groups and utilizes the Poisson–Boltzmann charge distribution around each proton combined with the basic Gamow equation of quantum mechanics for proton tunneling. It is shown that the proton tunneling distance equals the proton wavelength and that each proton surrounded by its Debye–Hückel cloud behaves as a leaking nanobattery.The model, which contains no adjustable parameters, is solved analytically and its predictions are in semiquantitative agreement with experiment, including the magnitude of the conductivity, its linear increase with membrane thickness, its exponential increase with potential and its strong dependence on PH2PH2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 52, Issue 6, 20 January 2007, Pages 2244–2256
نویسندگان
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