Facile synthesis of poly (arylene ether ketone)s containing flexible sulfoalkyl groups with enhanced oxidative stability for DMFCs |
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| Affiliation: | 1. College of Chemistry, Jilin University, Changchun, 130012, PR China;2. Key Laboratory of Advanced Batteries Physics and Technology (Ministry of Education), Jilin University, Changchun, 130012, PR China;3. Department of Research and Development, Changchun Changguang Aerospace Composite Materials Co., Ltd., Changchun, 130061, PR China;4. Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education), Heilongjiang University, Harbin, 150080, PR China;1. Polymeric Materials Research Lab, PG & Research Department of Chemistry, Alagappa Government Arts College, Karaikudi, 630003, India;2. Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, ON, K1N 6N5, Canada;3. Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Electrochemical Research Institute (CSIR-CECRI) Campus, Karaikudi 630003, India;4. CSIR-CECRI Madras Unit, CSIR Madras Complex, Chennai 600113, India;1. Department of Chemical Engineering, National Institute of Technology, Warangal 506004, Telangana, India;2. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;1. Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66045, USA;2. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing, 102206, China;1. Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, China;2. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China;3. Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK;4. Institute of Green Chemistry and Chemical Technology, Jiangsu University, Zhenjiang, 212013, China;5. School of Materials, Sun Yat-Sen University, Guangzhou, 510275, China |
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| Abstract: | After tethering sodium 2-mercaptoethanesulfonate (MTS) to the bromomethylated poly(arylene ether ketone) precursor, a novel clustered sulfonated poly(arylene ether ketone) containing flexible sulfoalkyl groups (MTSPAEK) was prepared and used as polymer electrolyte membrane for application in DMFCs. The chemical structure and the degree of grafting of MTSPAEK copolymers were identified by 1H NMR spectra. The resulted MTSPAEK copolymers exhibited excellent thermal stability (Td5% > 259 °C) and good mechanical properties (tensile strength at break > 52 MPa). Compared to conventional sulfonated aromatic hydrocarbon polymers, MTSPAEK membranes displayed enhanced oxidative stability in Fenton's reagent owing to the elimination of free radicals by the sulfide groups located on the polymer side chains. Especially, MTSPAEK-2.10 with the highest content of flexible sulfoalkyl groups exhibited a highest proton conductivity of 0.181 S cm?1 at 80 °C. It could be attributed to the obvious hydrophilic/hydrophobic phase-separated structure within the membrane, which was confirmed by AFM images. Moreover, MTSPAEK-2.10 membrane performed a peak power density of 70 mW cm?2 in DMFC when feeding with 2 M methanol at 80 °C, which was comparable to the performance of recast Nafion as reported. Therefore, the combination of good thermal stability and mechanical properties, good oxidative stability, and good methanol barrier performance of MTSPAEK membranes indicated that they have potential to be alternative materials for PEMs in DMFCs. |
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| Keywords: | Proton exchange membrane Sulfonated poly (arylene ether ketone)s Sulfoalkyl groups Direct methanol fuel cell |
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