An enhanced proton conductivity and reduced methanol permeability composite membrane prepared by sulfonated covalent organic nanosheets/Nafion |
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| Affiliation: | 1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China;2. University of Science and Technology of China, Hefei 230026, China;3. Sustainable Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;4. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing 211816, China;1. Academy of Scientific and Innovative Research (AcSIR), CSIR - Central Electrochemical Research Institute, Karaikudi 630003, India;2. CSIR - Central Electrochemical Research Institute-Madras Unit, CSIR Madras Complex, Taramani, Chennai 600113, India;1. National Center of Excellence for Petroleum, Petrochemicals and Advance Material, Department of Chemical Engineering, Kasetsart University, Bangkok 10900, Thailand;2. NANOTEC Center for Nanoscale Materials Design for Green Nanotechnology and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, 50 Ngam Wong Wan Rd, Ladyaow, Chatuchak, Bangkok 10900, Thailand;3. School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK;4. Department of Chemical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand;5. Research and Development Center for Chemical Unit Operation and Catalyst Design, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand;1. Key Laboratory of Functional Nanomaterials and Technology in Universities of Shandong, School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, China;2. Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin),Tianjin 300072, China;1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;3. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China;4. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;1. National Center of Excellence for Petroleum, Petrochemicals and Advance Material, Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand;2. NANOTEC Center for Nanoscale Materials Design for Green Nanotechnology and Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand;3. Department of Chemical Engineering, King Mongkut''s University of Technology North Bangkok, Bangkok 10800, Thailand;4. Research and Development Center for Chemical Unit Operation and Catalyst Design, King Mongkut''s University of Technology North Bangkok, Bangkok 10800, Thailand |
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| Abstract: | Sulfonated covalent organic nanosheets (SCONs) with a functional group (−SO3H) are effective at reducing ion channels length and facilitating proton diffusion, indicating the potential advantage of SCONs in application for proton exchange membranes (PEMs). In this study, Nafion-SCONs composite membranes were prepared by introducing SCONs into a Nafion membrane. The incorporation of SCONs not only improved proton conductivity, but also suppressed methanol permeability. This was due to the even distribution of ion channels, formed by strong electrostatic interaction between the well dispersed SCONs and Nafion polymer molecules. Notably, Nafion-SCONs-0.6 was the best choice of composite membranes. It exhibited enhanced performance, such as high conductivity and low methanol permeability. The direct methanol fuel cell (DMFC) with Nafion-SCONs-0.6 membrane also showed higher power density (118.2 mW cm−2), which was 44% higher than the cell comprised of Nafion membrane (81.9 mW cm−2) in 2 M methanol at 60 °C. These results enabled us to work on building composite membranes with enhanced properties, made from nanomaterials and polymer molecules. |
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| Keywords: | Proton exchange membranes Sulfonated covalent organic nanosheets Nafion membrane |
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