Separators for alkaline water electrolysis prepared by plasma-initiated grafting of acrylic acid on microporous polypropylene membranes |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian University of Technology, Dalian, 116023, China;2. School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, China;3. Panjin Institute of Industrial Technology, Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Dalian University of Technology, Panjin, 124221, Liaoning, China;1. CICECO—Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal;2. UIDM, ESTG, Polytechnic Institute of Viana Do Castelo, 4900-348, Viana Do Castelo, Portugal;1. Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 02792, Republic of Korea;2. Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Seongbuk-gu, Seoul 02792, Republic of Korea;3. Chemical Technology Faculty, NTUU Igor Sykorsky Kyiv Polytechnic Institute, Kyiv 03056, Ukraine;4. Transfercenter Sustainable Electrochemistry, Saarland University, 66125 Saarbrücken, Germany;5. Korea Institute of Science and Technology (KIST) Europe, Campus E7 1, 66123 Saarbrücken, Germany;6. School of Chemical and Biological Engineering, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea;7. Technical University of Denmark, Department of Energy Conversion and Storage, Elektrovej 375, 2800 Kgs. Lyngby, Denmark;8. Green school, Korea University, Seoul 136-713, Republic of Korea |
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| Abstract: | Highly hydrophilic separators for alkaline water electrolysis were prepared by plasma-initiated grafting of acrylic acid on porous polypropylene (PP) membranes. The membranes were activated in a low-pressure radio-frequency discharge in oxygen and subsequently graft polymerization of acrylic acid was performed in aqueous solution. The membranes were characterized by gravimetric grafting degree (GD), SEM, FTIR, critical wetting surface tension (CWST) test, mechanical strength, and electrolytic conductivity. Moreover, the membranes were applied as separators in alkaline electrolysis cell, and content of hydrogen in the produced oxygen was measured to determine membrane permeability to hydrogen dissolved in the electrolyte. It was observed that increasing GD improves performance of membranes as separators in alkaline electrolysis, although the particular effects on the electrolytic conductivity and hydrogen permeability strongly depend on structure the of initial PP substrate. Ageing test conducted in 30 wt% KOH at 60 °C revealed that although considerable degrafting took place at beginning of the test, the remaining polyacrylic acid provided highly hydrophilic character to membrane for 7000 h of the test. |
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| Keywords: | Alkaline water electrolysis Separator membrane Plasma initiated grafting Acrylic acid Resistance Gas purity |
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