Proton exchange membrane is the key factor of vanadium redox flow battery (VRB) as their stability largely determine the lifetime of the VRB. In this study, a SPEEK/MWCNTs-OH composite membrane with ultrahigh stability is constructed by blending sulfonated poly(ether ether ketone) (SPEEK) with multi-walled carbon nanotubes toward VRB application. The carbon nanotubes disperse homogeneously in the SPEEK matrix with the assistance of hydroxyl group. The blended membrane exhibits 94.2 and 73.0% capacity retention after 100 and 500 cycles, respectively in a VRB single cell with coulombic efficiency of over 99.4% at 60 mA cm-2 indicating outstanding capability of reducing the permeability of vanadium ions and enhancing the transport of protons. The ultrahigh stability and low cost of the composite membrane make it a competent candidate for the next generation larger-scale vanadium redox flow battery.
CITATION STYLE
Ding, M., Ling, X., Yuan, D., Cheng, Y., Wu, C., Chao, Z. S., … Jia, C. (2018). SPEEK membrane of ultrahigh stability enhanced by functionalized carbon nanotubes for vanadium redox flow battery. Frontiers in Chemistry, 6(JUL). https://doi.org/10.3389/fchem.2018.00286
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