کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7725048 1497841 2018 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Physical modeling of polymer-electrolyte membrane fuel cells: Understanding water management and impedance spectra
ترجمه فارسی عنوان
مدلسازی فیزیکی سلول های سوختی غشای پلیمری الکترولیتی: درک مدیریت آب و طیف امپدانس
کلمات کلیدی
سلول سوختی غشای الکترولیتی پلیمر، مدلسازی فیزیکی، جریان چند مرحلهای، طیف سنجی امپدانس الکتروشیمیایی، تجزیه و تحلیل امپدانس، پدیده های القایی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
A transient 2D physical continuum-level model for analyzing polymer electrolyte membrane fuel cell (PEMFC) performance is developed and implemented into the new numerical framework NEOPARD-X. The model incorporates non-isothermal, compositional multiphase flow in both electrodes coupled to transport of water, protons and dissolved gaseous species in the polymer electrolyte membrane (PEM). Ionic and electrical charge transport is considered and a detailed model for the oxygen reduction reaction (ORR) combined with models for platinum oxide formation and oxygen transport in the ionomer thin-films of the catalyst layers (CLs) is applied. The model is validated by performance curves and impedance spectroscopic experiments, performed under various operating conditions, with a single set of parameters and used to study water management in co- and counter-flow operation. Based on electrochemical impedance spectra (EIS) simulations, the physical processes which govern the PEMFC performance are analyzed in detail. It is concluded that the contribution of diffusion through the porous electrodes to the overall cell impedance is minor, but concentration gradients along the channel have a strong impact. Inductive phenomena at low frequencies are identified from physics-based modeling. Induction is caused by humidity dependent ionomer properties and platinum oxide formation on the catalyst surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 391, 1 July 2018, Pages 148-161
نویسندگان
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