کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
195360 459812 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-isothermal cold start of polymer electrolyte fuel cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Non-isothermal cold start of polymer electrolyte fuel cells
چکیده انگلیسی

A multiphase, three-dimensional model has been developed to describe non-isothermal cold start of a polymer electrolyte fuel cell (PEFC) and to delineate intricate interactions between ice formation and heat generation during cold start. The effect of rising cell temperature is numerically explored by comparing a non-isothermal cold start with an isothermal one. It is found that more water is transported into the membrane and less ice formation occurs in the cathode catalyst layer (CL) in the presence of rising cell temperature. In addition, the more hydrated membrane and the rising cell temperature greatly lower the membrane resistance, thus giving rise to higher cell voltage. A lumped thermal analysis significantly over-estimates the overall thermal requirement of self-startup as a cell requires only a portion of its active area to reach the freezing point and be ice-free and operable. It is also found that pre-startup conditions have significant influence on cold start. Procedures to minimize residual water inside the cell prior to cold start, such as gas purge, are critically important. Finally, non-isothermal cold start becomes much easier from higher ambient temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 53, Issue 2, 1 December 2007, Pages 610–621
نویسندگان
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