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A Chitosan/Urushi Anion Exchange Membrane for a Non–aqueous Redox Flow Battery
Author(s) -
Gong SungJun,
Kim Dongyoung,
Cho Eunhae,
Hwang Seung Sang,
Won Jongok
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601772
Subject(s) - flow battery , chitosan , membrane , chemical engineering , aqueous solution , redox , polymerization , faraday efficiency , materials science , vanadium , ion exchange , interpenetrating polymer network , chemistry , polymer chemistry , polymer , nuclear chemistry , electrochemistry , inorganic chemistry , electrode , ion , organic chemistry , composite material , biochemistry , engineering , electrolyte
A new bio‐based anion exchange composite membrane that consists of a chitosan/urushi (C/U) pseudo‐interpenetrating polymer network (IPN) coated on the surface of a porous support was prepared for non‐aqueous redox flow battery (RFB). Celgard membranes composed of polypropylene were used as the porous support. A C/U pseudo‐IPN film was formed by laccase‐catalysed polymerization and aerobic oxidative polymerization. The ion conductivity increased with an increasing amount of chitosan in the C/U coating layer, and the composite membranes had lower vanadium acetylacetonate permeability than a pristine Celgard support. The performance of a non‐aqueous RFB increased with an increasing amount of chitosan in the C/U layer in the surface‐modified Celgard membrane. The coulombic efficiency and energy efficiency values were 66% and 40.5%, respectively, for a RFB with a surface‐modified membrane that contained 17 wt% chitosan in the C/U layer. These values were higher than those of the commercial Neosepta AHA membrane, which had a dense structure, indicating that the C/U pseudo‐IPN layer on the porous support provided the selectivity of the redox active species.