Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 670, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2023.121351
Keywords
Hydroxyl quaternized group; Sulfate ester group; Amphoteric ion conductive membrane; Ionic conductive channel; Vanadium redox flow battery
Categories
Ask authors/readers for more resources
A novel hydroxyl bromopropane anionic precursor side chain is proposed to incorporate cations into the ionic conductive channels for selectively repelling vanadium ions. Compared with Nafion 212 membrane, the obtained ampho-teric membrane exhibits much lower vanadium ion permeability (1.9 x 10(-9) cm(2)s(-1)) and slightly lower area resistance (0.25 Omega cm(2)). Excellent performance of vanadium redox flow battery (coulombic efficiency, 99.2%, energy efficiency, 85.9% at 100 mA cm(-2) and 0.31% discharge decay rate) is achieved, surpassing most reported amphoteric ion conductive and Nafion 212 membranes.
Anionic conductive group repels vanadium ions but is difficult to be incorporated into the selectively ionic conductive channels of the amphoteric ion conductive membrane with tunable ratio. Herein, the novel hydroxyl bromopropane anionic precursor side chain is proposed, in which the hydrophilic hydroxyl groups aggregate into ionic clusters with the sulfate ester cationic conductive side chains of polybenzimidazole via hydrogen bond during membrane casting. The subsequent conversion of the bromopropane precursor to quaternary ammonium can easily tune the anionic exchange capacity and integrate cations into the hydroxyl involved ionic conductive channels for selectively repelling vanadium ions. Compared with Nafion 212 membrane, the obtained ampho-teric membrane exhibits much lower vanadium ion permeability (1.9 x 10(-9) cm(2)s(-1)) and slightly lower area resistance (0.25 Omega cm(2)). Excellent performance of vanadium redox flow battery (coulombic efficiency, 99.2%, energy efficiency, 85.9% at 100 mA cm(-2) and 0.31% discharge decay rate) is achieved, and efficiencies keep stable during the 500 cycles test. The performance of VRFB is surpass than that of most reported amphoteric ion conductive and Nafion 212 membranes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available