کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1276189 1497489 2014 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Water transport study in a high temperature proton exchange membrane fuel cell stack
ترجمه فارسی عنوان
مطالعه حمل و نقل آب در پشته سلول سوخت سلولی غشای تبادل پروتون با درجه حرارت بالا
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• Water transport in a 12 cell PBI-based HTPEM fuel cell stack is investigated.
• Even with dry gases up to 10% of water leaves the stack through the anode outlet.
• Water transport from cathode to anode rises with current density.
• Anode outlet water concentration is almost always higher than on the cathode.
• Membrane water permeability is determined to be 2.4 × 10−13 mol s−1 cm−1 Pa−1 at 160 °C.

A study of water transport in a high temperature phosphoric acid doped polybenzimidazole (PBI) membrane fuel cell stack is reported. Tests with different stoichiometries of dry cathode and different humidity levels of anode are performed. It is found that water transport across the membrane electrode assembly (MEA) is noteworthy and that water vapor partial pressure on the anode outlet is almost always higher than on the cathode outlet, even when using dry hydrogen. The water transport is a strong function of current density but it also depends on stoichiometry and humidity level. In a series of tests with dry nitrogen on one side and humid nitrogen on the other side, the membrane's water permeability coefficient is determined to be 2.4 × 10−13 mol s−1 cm−1 Pa−1 at 160 °C which is more than an order of magnitude higher than the values previously reported in the literature. Also, the results indicate that the permeability coefficient might be relative humidity dependent and could even be somewhat higher than the value reported here, but further investigation is needed. The experimental findings are reproduced and explained with a 2D steady state computational fluid dynamics (CFD) model. Internal water transport profiles across the membrane and along the gas flow channels are presented and discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 20, 3 July 2014, Pages 10627–10640
نویسندگان
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