کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1289784 | 973309 | 2010 | 7 صفحه PDF | دانلود رایگان |
This paper reports on the development of polymer electrolyte membranes (PEMs) based on sulfonated polysulfone for application in a DMFC mini-stack operating at room temperature in passive mode. The sulfonated polysulfone (SPSf) with two degrees of sulfonation (57 and 66%) was synthesized by a well-known sulfonation process. SPSf membranes with different thicknesses were prepared and investigated. These membranes were characterized in terms of methanol/water uptake, proton conductivity, and fuel cell performance in a DMFC single cell and mini-stack operating at room temperature. The study addressed (a) control of the synthesis of sulfonated polysulfone, (b) optimization of the assembling procedure, (c) a short lifetime investigation and (d) a comparison of DMFC performance in active-mode operation vs. passive-mode operation.The best passive DMFC performance was 220 mW (average cell power density of about 19 mW cm−2), obtained with a thin SPSf membrane (70 μm) at room temperature, whereas the performance of the same membrane-based DMFC in active mode was 38 mW cm−2. The conductivity of this membrane, SPSf (IEC = 1.34 mequiv. g−1) was 2.8 × 10−2 S cm−1. A preliminary short-term test (200 min) showed good stability during chrono-amperometry measurements.
Journal: Journal of Power Sources - Volume 195, Issue 23, 1 December 2010, Pages 7727–7733