Preparation and properties of crosslinked sulphonated poly(arylene ether sulphone) blend s for direct methanol fuel cell applications |
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Authors: | Jie-Cheng Tsai Jen-Feng Kuo |
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Affiliation: | a Advanced Propulsion and Power System Research Center, National Cheng-Kung University, Tainan 70148, Taiwan b Department of Chemical Engineering, National Cheng-Kung University, Tainan 70148, Taiwan |
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Abstract: | HMS-based sulphonated poly(arylene ether sulphone) (HMSSH) is synthesised using 4,4′-dihydroxy-α-methylstilbene (HMS) monomer to introduce an interesting stilbene core as crosslinkable group. Crosslinked blend membranes are obtained by blending the BPA-based sulphonated poly(arylene ether sulphone) (BPASH) with crosslinkable HMS-based sulphonated poly(arylene ether sulphone) by UV irradiation of the blend membrane. Compared to the native BPASH with crosslinked BPASH/HMSSH blend membranes, the crosslinked blend membranes greatly reduce the water uptake and methanol permeability with only a slight reduction in proton conductivity. The crosslinked blend membrane, which has a 6% HMSSH content, has a water uptake of 59%, methanol permeability of 0.75 × 10−6 cm2 s−1, and proton conductivity of 0.08 S cm−1. A membrane-electrode assembly is used to investigate single-cell performance and durability test for DMFC applications. Both the power density and open circuit voltage are higher than those of Nafion® 117. A maximum power density of 32 mW cm−2 at 0.2 V is obtained at 80 °C, which is higher than that of Nafion® 117 (25 mW cm−2). |
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Keywords: | Proton exchange membrane Sulphonated poly(arylene ether sulphone) Cross-linking Direct methanol fuel cell 4,4&prime -Dihydroxy-α-methylstilbene (HMS) |
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