کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5149702 | 1497890 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polymer electrolyte membrane water electrolysis: Restraining degradation in the presence of fluctuating power
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Polymer electrolyte membrane (PEM) water electrolysis generates 'green' hydrogen when conducted with electricity from renewable - but fluctuating - sources like wind or solar photovoltaic. Unfortunately, the long-term stability of the electrolyzer performance is still not fully understood under these input power profiles. In this study, we contrast the degradation behavior of our PEM water electrolysis single cells that occurs under operation with constant and intermittent power and derive preferable operating states. For this purpose, five different current density profiles are used, of which two were constant and three dynamic. Cells operated at 1 A cmâ2 show no degradation. However, degradation was observed for the remaining four profiles, all of which underwent periods of high current density (2 A cmâ2). Hereby, constant operation at 2 A cmâ2 led to the highest degradation rate (194 μV hâ1). Degradation can be greatly reduced when the cells are operated with an intermittent profile. Current density switching has a positive effect on durability, as it causes reversible parts of degradation to recover and results in a substantially reduced degradation per mole of hydrogen produced. Two general degradation phenomena were identified, a decreased anode exchange current density and an increased contact resistance at the titanium porous transport layer (Ti-PTL).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 342, 28 February 2017, Pages 38-47
Journal: Journal of Power Sources - Volume 342, 28 February 2017, Pages 38-47
نویسندگان
Christoph Rakousky, Uwe Reimer, Klaus Wippermann, Susanne Kuhri, Marcelo Carmo, Wiebke Lueke, Detlef Stolten,