Investigation of sulfonated polysulfone membranes as electrolyte in a passive-mode direct methanol fuel cell mini-stack |
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Authors: | F Lufrano V Baglio P Staiti A Stassi AS Aricò V Antonucci |
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Affiliation: | CNR - ITAE, Istituto di Tecnologie Avanzate per l’Energia “Nicola Giordano”, Via Salita S. Lucia sopra Contesse n. 5 - 98126 S. Lucia - Messina, Italy |
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Abstract: | 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. |
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Keywords: | Direct methanol fuel cells Sulfonated polysulfone Polymer electrolyte Passive mode Mini-stack |
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