کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1281310 1497499 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental analysis of a degraded open-cathode PEM fuel cell stack
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Experimental analysis of a degraded open-cathode PEM fuel cell stack
چکیده انگلیسی


• Degradation analysis of a commercial 20-cell, open-cathode stack.
• Combination of in-situ and post-mortem ex-situ experiments.
• Proof of ECSA loss due to Pt oxidation, particle growth and agglomeration.
• Cells located next to anode outlet degrade much faster than others.

The well-known challenges to overcome in PEM fuel cell research are their relatively low durability and the high costs for the platinum catalysts. This work focuses on degradation mechanisms that are present in open-cathode PEM fuel cell systems and their links to the decaying fuel cell performance. Therefore a degraded, open-cathode, 20 cell, PEM fuel cell stack was analyzed by means of in-situ and ex-situ techniques. Voltage transients during external perturbations, such as changing temperature, humidity and stoichiometry show that degradation affects individual cells quite differently towards the end of life of the stack. Cells located close to the endplates of the stack show the biggest performance decay. Electrochemical impedance spectroscopy (EIS) data present non-reversible catalyst layer degradation but negligible membrane degradation of several cells. Post-mortem, ex-situ experiments, such as cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) show a significant active area loss of the first cells within the stack due to Pt dissolution, oxidation and agglomeration. Scanning electron microscope (SEM) images of the degraded cells in comparison with the normally working cells in the stack show severe carbon corrosion of the cathode catalyst layers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 10, 26 March 2014, Pages 5378–5387
نویسندگان
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