کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1286336 973184 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transient response of a proton exchange membrane fuel cell
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Transient response of a proton exchange membrane fuel cell
چکیده انگلیسی

The transient response of a proton exchange membrane fuel cell (PEMFC) supplied with pure hydrogen and oxygen was investigated by load step measurements assisted by electrochemical impedance spectroscopy and chronoamperometry. Using an in-house designed resistance board, the uncontrolled response in both cell voltage and current upon step changes in a resistive load was observed. The PEMFC was found to respond quickly and reproducibly to load changes. The transient PEMFC response was limited by a cathodic charge transfer process with a potential-dependent response time. For load steps to high-current densitities, a second transient process with a constant response time was observed. This transient was offset from the charge transfer transient by a temporarily stable plateau. Results from chronoamperometry indicated that the second transient could be related to a diffusion process. Transient paths were plotted in the V–i diagram, matching a predicted pattern with overshooting cell voltage and current during a load step.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 171, Issue 2, 27 September 2007, Pages 321–330
نویسندگان
, , , ,