Ether-free polymeric anion exchange materials with extremely low vanadium ion permeability and outstanding cell performance for vanadium redox flow battery (VRFB) application
- Authors
- Cha, Min Suc; Jo, Sang Woo; Han, Seung Hui; Hong, Soo Hyun; So, Soonyong; Kim, Tae-Ho; Oh, Seong-Geun; Hong, Young Taik; Lee, Jang Yong
- Issue Date
- Feb-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Anion exchange membrane; poly(p-phenylene); Vanadium redox flow battery
- Citation
- JOURNAL OF POWER SOURCES, v.413, pp.158 - 166
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 413
- Start Page
- 158
- End Page
- 166
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32908
- DOI
- 10.1016/j.jpowsour.2018.12.036
- ISSN
- 0378-7753
- Abstract
- Ether-free polyp-phenylene)-based anion exchange membrane materials with outstanding vanadium ion blocking properties are reported. The synthesized ionomers with a rigid backbone structure show small dimensional variations despite the high ion exchange capacities. Among the synthesized membranes, the QPPP-2 membrane with ion exchange capacity of 2.1 meq.g(-1) exhibits high anion (OH-, SO42-, and Cl-) conductivity. The QPPP-2 membrane shows an extremely low diffusion coefficient (2.12 x 10(-9) Cm-2 min(-1)) for VO2+, which is much lower than that of Nafion 115 (2.88 x 10(-6) cm(2) min(-1)), indicating the vanadium ion blocking property of QPPP-2. Moreover, the chemical and operational stabilities of the membranes are investigated via ex situ soaking tests in 0.1 M VO2+ solution and in situ operation tests for 100 cycles, respectively. The vanadium redox flow battery single cell assembled with the QPPP-2 membrane exhibits a coulombic efficiency of 99%, voltage efficiency of 87%, and energy efficiency of 86% during 100 cycles at 80 mA cm(-2). The excellent chemical, morphological, and electrochemical properties of the QPPP-2 membrane make it suitable for use in vanadium redox flow battery.
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