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Ultra‐High Ion Selectivity of a Modified Nafion Composite Membrane for Vanadium Redox Flow Battery by Incorporation of Phosphotungstic Acid Coupled UiO‐66‐NH 2
Author(s) -
Yang XiaoBing,
Zhao Lei,
Goh Kokswee,
Sui Xu–Lei,
Meng LingHui,
Wang ZhenBo
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900888
Subject(s) - phosphotungstic acid , flow battery , vanadium , nafion , membrane , redox , selectivity , materials science , inorganic chemistry , conductivity , composite number , chemistry , chemical engineering , electrolyte , organic chemistry , electrochemistry , electrode , composite material , catalysis , biochemistry , engineering
An ultra‐high ion‐selective Nafion composite membrane for vanadium redox flow battery (VRB) by incorporation of phosphotungstic acid (PWA) coupled UiO‐66‐NH 2 was prepared through solution casting. Simple tuning for the filling amount of the nanohybrid composed of PWA and UiO‐66‐NH 2 gives the obtained membranes preeminent vanadium barrier property including a minimum vanadium permeability of 3.46 × 10 −7 cm 2 min −1 and excellent proton transport capability including a maximum proton conductivity of 0.092 S cm −1 at 25 °C. These indicate an ion selectivity of 2.66 × 10 5 S min cm −3 , showing an overwhelming advantage over recast Nafion (0.34 × 10 5 S min cm −3 ). As a result, the VRB constructed with the modified membrane exhibits superior battery performance versus recast Nafion at various current densities.