کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
636380 | 1456123 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Deterioration of mechanical properties: A cause for fuel cell membrane failure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The mechanical properties of Nafion® membranes that were degraded after periods of open circuit voltage (OCV) conditions in a fuel cell were studied. Severe decreases in membrane modulus and ductility at 80 °C and 100% relative humidity were observed. Stress-at-break values for 45 and 72 h degraded membrane-electrode assemblies (MEAs) were 6 and 9 times lower, respectively, while strain-at-break was 24 and 28 times lower, respectively, than that of a control MEA. Contractile stresses developed in constrained hydrated membranes that were then dried were conducted as a function of drying time. A pre-OCV degraded MEA, when subjected to creep deformation at 10 MPa, showed surface cracks which were not present in the control MEA. The 72 h-degraded MEA exhibited wider cracks than those of the 45 h-degraded MEA sample. Spectroscopic analysis of degraded membranes showed various small molecule fragments associated with side chain degradation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 356, Issues 1â2, 1 July 2010, Pages 7-13
Journal: Journal of Membrane Science - Volume 356, Issues 1â2, 1 July 2010, Pages 7-13
نویسندگان
Yatin P. Patil, William L. Jarrett, Kenneth A. Mauritz,