4.4 Article

Tuning hydrophobic composition in terpolymer-based anion exchange membranes to balance conductivity and stability

Journal

MOLECULAR SYSTEMS DESIGN & ENGINEERING
Volume 7, Issue 7, Pages 798-808

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2me00027j

Keywords

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Funding

  1. Japan Science and Technology (JST) through SICORP [JPMJSC18H8]
  2. Iwatani Naoji Foundation
  3. JKA promotion funds from AUTORACE
  4. thermal and electric energy technology foundation
  5. New Energy and Industrial Technology Development Organization (NEDO)
  6. Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [KAKENHI 18H05515]

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In this study, novel terpolymer-based anion conductive polymers were designed and synthesized, and the effect of hydrophobic composition on membrane properties was investigated. The results showed that QBPA-1 and QBPA-5 membranes exhibited the best-balanced properties.
We designed and synthesized novel terpolymer-based anion conductive polymers, where the effect of hydrophobic composition on the membrane properties was investigated in detail. Precursor terpolymers were first prepared from 2,2-bis(4-chlorophenyl)hexafluoropropane (BAF), 1,6-bis(3-chlorophenyl)perfluorohexane (PAF), and 2,7-dichloro-9,9-bis[6 '-(N,N-dimethylamino)hexyl]fluorene via Ni(0)-promoted polycondensation reaction. The following quaternization reaction with dimethyl sulfate was successful to obtain five terpolymers, QBPA with different PAF/(BAF + PAF) compositions and supposed chemical structures. QBPA provided thin and bendable membranes by solution casting. TEM images suggested that the membranes exhibited a phase-separated morphology similar to those of the corresponding parent copolymer membranes. SAXS profiles indicated that QBPA-4 containing 83 mol% PAF exhibited the most distinct periodic structure based on the hydrophobic component. The hydroxide ion conductivity of the membranes showed a volcano-type dependence on the hydrophobic composition, and the highest conductivity (161 mS cm(-1)) was achieved with the QBPA-1 membrane at 80 degrees C. Taking also the other properties into account, QBPA-1 and QBPA-5 containing 17 mol% PAF seemed the best-balanced membranes. An alkaline fuel cell using the QBPA-1 membrane achieved a maximum power density of 273 mW cm(-2), exceeding that using the copolymer BAF-QAF membrane (185 mW cm(-2)).

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