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Direct methanol fuel cell performance of sulfonated poly (2,6-dimethyl-1,4-phenylene oxide)-polybenzimidazole blend proton exchange membranes |
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| Authors: | Amir Hossein HaghighiMohammad Mahdi Hasani-Sadrabadi Erfan DashtimoghadamGhasem Bahlakeh Seyyed Emadodin ShakeriFatemeh S Majedi Shahriar Hojjati EmamiHomayoun Moaddel |
| Affiliation: | a Faculty of Engineering, Islamic Azad University, Shiraz Branch, Shiraz, Fars, Iran b Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran c Institute of Bioengineering, Swiss Federal Institutes of Technology, Lausanne (EPFL), Lausanne, Switzerland d Departments of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran e Departments of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran f Hydrogen & Fuel Cell Inc., Arcadia, CA, USA |
| Abstract: | Various sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO)-polybenzimidazole (PBI) blend membranes were prepared and investigated as proton exchange membranes (PEMs) for direct methanol fuel cell (DMFC) applications. With increasing PBI content water swelling, ion exchange capacity, proton conductivity and methanol permeability of SPPO-PBI membranes were found to be decreased due to acid-base interactions between sulfonate and the amine groups of the blended components. Among various SPPO-PBI blend membranes, 80:20 wt% was found as the optimum composition, which showed the highest membrane selectivity parameter. Direct methanol-air single fuel cell tests revealed a higher cell efficiency of 11.6% for SPPO80-PBI20 than 10.9% for Nafion®117 at 5 M methanol feed, and also a higher power density of 57.6 mW.cm−2 compared to 39.4 mW.cm−2 for Nafion®117. Transport properties as well as DMFC performance results of SPPO-PBI blend PEMs converge to indicate their potential for DMFC applications. |
| Keywords: | Polymeric blend Proton exchange membrane Acid-base interaction Direct methanol fuel cell |
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