Novel sulfonated poly(oxybenzimidazole) membranes bearing sulfo-napthalimide pendant groups with improved proton conductivity and fuel cell performance |
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| Affiliation: | 1. Department of Energy Conversion Enegineering, Wroclaw University of Science and Technology, 27 Wybrzeze St. Wyspianskiego, Wroclaw, 50-370, Poland;2. Department of Analytical Chemistry and Chemical Metallurgy, Wroclaw University of Science and Technology, Wybrzeze St. Wyspianskiego 27, 50-370, Wroclaw, Poland;1. Center for Combustion Energy, Tsinghua University, Beijing, 100084, China;2. Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;3. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, China |
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| Abstract: | The goal of the present work is to introduce a new aromatic bulky six-membered sulfo-napthalimide pendant groups, specifically 2-(2,5-dicarb-oxyphenyl-1,3-dioxo- 2,3-didihydro-1Hbenzode]isoquinoline-6-sulfonate (PDDDBIS), into the poly(oxybenzimidazole) (POBI) main chain. As no sulfo-napthalimide-bearing POBI has been reported yet, this could be a potential strategy to improve the solubility, processability, and proton conductivity of sulfonated POBIs in addition to boosting fuel cell performance. Out of six membranes synthesized, one sulfonated POBI membrane with pendant PDDDBIS groups (SPOBI-100) exhibited a fairly high proton conductivity of 0.172 S/cm, which is higher than Nafion-117 (0.161 S/cm) at 90 °C. Notably, an H2/O2 PEM fuel cell fabricated with the SPOBI-100 membrane displayed good performance with the maximum peak power density of 547 mW/cm2 and output current density of 1259 mA/cm2 in 0.99 V at 90 °C with100% RH, which is higher than the Nafion 117 power density (519 mW/cm2) and current density (1215 mA/cm2) under the same testing conditions. |
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| Keywords: | Sulfonated poly(oxybenzimidazole) Pendant group Nafion-117 Current density Proton conductivity Power density |
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