123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation for Young Polymer Scientists
Room No. Room 403
Time THU 10:36-10:48
Code POLY.O-9
Subject Sulfonated mesoporous membrane with high ion permselectivity for vanadium redox flow batteries
Authors Choongseop Jeon, Myungeun Seo1,*
graduate school of nanoscience and technology, Korea Advanced Institute of Science and Technology, Korea
1Graduate School of Nano Science Technology, Korea Advanced Institute of Science and Technology, Korea
Abstract Mesoporous membranes with well-controlled pore size are useful for size-exclusive separation, where substances only smaller than the pore can traverse across the membrane. In a vanadium redox flow battery (VRFB), cation permselectivity providing facile proton transport and suppressed vanadium cross-over is one of the most important issues to ensure long cyclability without loss of voltage efficiency. We show that sulfonated mesoporous membranes synthesized via polymerization-induced microphase separation almost exclude vanadium cross-over when the pore size is below at 4 nm. Proton conductivity is retained because of facilitated hopping process along the sulfonated pore surface. VRFB cell data suggests higher efficiency and slower decrement in discharge Q compared to Nafion 212, demonstrating promise of this approach.
E-mail wjscndtjq@kaist.ac.kr