Abstract
In this study, blended anion exchange membranes were prepared using polyphenylene oxide containing quaternary ammonium groups and polyvinylidene fluoride. A polyvinylidene fluoride with high hydrophobicity was blended in to lower the vanadium ion permeability, which increased when the hydrophilicity increased. At the same time, the dimensional stability also improved due to the excellent physical properties of polyvinylidene fluoride. Subsequently, permeation of the vanadium ions was prevented due to the positive charge of the anion exchange membrane, and thus the permeability was relatively lower than that of a commercial proton exchange membrane. Due to the above properties, the self-discharge of the blended anion exchange membrane (30.1 h for QA–PPO/PVDF(2/8)) was also lower than that of the commercial proton exchange membrane (27.9 h for Nafion), and it was confirmed that it was an applicable candidate for vanadium redox flow batteries.
Highlights
Because natural energy, e.g., solar, wind, and geothermal, are fluctuating forms of energy, the need for energy storage technologies is expanding
DCR(t) dt where L is the thickness of the Blended Anion Exchange Membranes (BAEMs), VR is the volume of the right chamber, A is the active area of the BAEMs, CL is the concentration of VO2+ in the left chamber, CR(t) is the concentration of vanadium in the right chamber at the time of t, and t itself is the measurement time [20]
The ion conductivities of the BAEMs with different ratios of polyvinylidene fluoride (PVDF) were measured at 25, 40, 60, and 80 ◦C
Summary
E.g., solar, wind, and geothermal, are fluctuating forms of energy, the need for energy storage technologies is expanding. An ideal membrane for a VRFB system should have stable vanadium impermeability, high ion conductivity, and mechanical and chemical stability [8,9]. These days, membranes made of Nafion, invented by Dupont in the US, are the most widely used VRFB membranes in light of their excellent proton conductivity and remarkable physicochemical stability. Differential vanadium crossover is reduced, which eventually results in high coulombic efficiency and long self-discharge duration of the VRFB [23,24,25] Another advantage is that membrane degradation through chemical oxidation by VO2+ is low [26,27]. Based on the results of the evaluation, we tried to confirm whether this material is applicable for redox flow batteries
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
