Robust proton exchange membrane for vanadium redox flow batteries reinforced by silica-encapsulated nanocellulose |
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| Affiliation: | 1. Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai, 200240, China;2. Hainan YeGuo Foods CO.,LTD., No.1 Fuji RD, Xiuying Area, Haikou, 570311, China;1. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, PR China;2. Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;3. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 102488, PR China |
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| Abstract: | High ion selectivity and mechanical strength are critical properties for proton exchange membranes in vanadium redox flow batteries. In this work, a novel sulfonated poly(ether sulfone) hybrid membrane reinforced by core-shell structured nanocellulose (CNC-SPES) is prepared to obtain a robust and high-performance proton exchange membrane for vanadium redox flow batteries. Membrane morphology, proton conductivity, vanadium permeability and tensile strength are investigated. Single cell tests at a range of 40–140 mA cm?2 are carried out. The performance of the sulfonated poly(ether sulfone) membrane reinforced by pristine nanocellulose (NC-SPES) and Nafion® 212 membranes are also studied for comparison. The results show that, with the incorporation of silica-encapsulated nanocellulose, the membrane exhibits outstanding mechanical strength of 54.5 MPa and high energy efficiency above 82% at 100 mA cm?2, which is stable during 200 charge-discharge cycles. |
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| Keywords: | Vanadium redox flow batteries Ion exchange membrane Sulfonated poly (ether sulfone) Nanocellulose Energy efficiency |
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