A novel amphoteric ion-exchange membrane prepared by the pore-filling technique for vanadium redox flow batteries. Issue 67 (1st July 2016)

• Record Type: Journal Article
• Authors: Lee, M. S.; Kang, H. G.; Jeon, J. D.; Choi, Y. W.; Yoon, Y. G.
• Is Part Of: RSC advances. Volume 6:Issue 67(2016)
• Page Start: 63023
• Page End: 63029
• Publication Date: 2016-07-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra07790k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A novel amphoteric ion-exchange membrane (AIEM) was prepared through the pore-filling technique, for vanadium redox flow battery (VRBs) applications. Abstract : A novel amphoteric ion-exchange membrane (AIEM) was prepared through the pore-filling technique, for vanadium redox flow battery (VRBs) applications. Their physico-chemical properties including vanadium ion permeability and electrochemical properties were investigated as a function of cross-linking degrees. Vanadium ion permeability was effectively suppressed by the quaternary ammonium group-induced Donnan exclusion effect and was only 7.7% of that of Nafion117. Finally, open circuit voltage measurements showed that VRBs assembled with the AIEM maintained voltages >1.3 V for over 43 h, which was superior to the cation exchange membranes (CEMs), studied. In addition, the VRBs with AIEM-4 exhibited higher columbic efficiency ( ca. 98%) and energy efficiency ( ca. 89%) than those with CEMs. Therefore, it may be concluded that pore-filled AIEMs are more suitable for use in VRBs than pore-filled CEMs. This work provides a convenient method for preparing new types of IEMs for various applications.