کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1290417 973325 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Degradation analysis and modeling of reinforced catalyst coated membranes operated under OCV conditions
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Degradation analysis and modeling of reinforced catalyst coated membranes operated under OCV conditions
چکیده انگلیسی

This paper studies the degradation of Gore™ PRIMEA® series 5510 catalyst coated membranes with an ePTFE reinforcement layer under open circuit voltage conditions at 90 °C, 75% RH, and no backpressure. Scanning electron microscopy (SEM) imaging of cross-sections revealed extensive cathode-side ionomer degradation and the presence of a platinum band. Cumulative fluoride release measurements show more fluoride exiting with the cathode effluent. Furthermore, both anode and cathode cumulative fluoride release plateau after long degradation times. Open circuit voltage was also monitored and the degradation rate was found to decrease after a long duration. It is proposed that all fluoride species are generated from the cathode-side ionomer degradation process and that the fluoride then diffuses to the anode and cathode channels. Further, once the cathode-side ionomer is consumed the degradation reaction slows as the “degradation front” passes through the inert reinforcement layer. This process was modeled using a semi-empirical transient model and compared to experimental results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 183, Issue 2, 1 September 2008, Pages 619–628
نویسندگان
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