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wiki:pub:j.memsci.2016.10.050

这是本文档旧的修订版!


Preparation of covalently cross-linked sulfonated polybenzimidazole membranes for vanadium redox flow battery applications

Zijun Xiaa, b, Libin Yinga, Jianhua Fanga, , , Yu-Yu Duc, Wei-Ming Zhangc, , , Xiaoxia Guoa, Jie Yina Show more http://doi.org/10.1016/j.memsci.2016.10.050

Highlights

  • Highly sulfonated polybenzimidazoel copolymers have been synthesized.
  • The covalently cross-linked sulfonated polybenzimidazole membranes exhibit 3-4 orders of magnitude lower VO2+ permeability and 6–30 times higher H/V selectivity than Nafion 117.
  • The redox flow battery assembled with a cross-linked membrane exhibits high energy efficiency (85%) at 60 mA cm−2.
  • The redox flow battery displays little performance decay after 300 charge-discharge cycles.

Abstract A series of polybenzimidazole copolymers with varied content of pendant amino groups have been synthesized by condensation polymerization of 4,4′-dicarboxydiphenyl ether (DCDPE), 5-aminoisophthalic acid (APTA) and 3,3′-diaminobenzidine (DAB) in polyphosphoric acid at 190 °C for 20 h. The resulting copolymers undergo post-sulfonatation in fuming sulfuric acid at 100 °C yielded the highly sulfonated polybenzimidazoles (SOPBI-NH2(x/y), ‘x/y’ refers to the monomer molar ratio of DCDPE to APTA). A series of covalently cross-linked membranes (CSOPBI-NH2(x/y)) with good mechanical properties are fabricated by solution cast technique using bisphenol A epoxy resin as a cross-linker. The CSOPBI membranes show 3–4 orders of magnitude lower VO2+ permeability and 6–30 times higher ion diffusion selectivity (proton vs. VO2+) than Nafion117. The charge-discharge behaviors of the vanadium redox flow batteries (VRBs) assembled with the CSOPBI-NH2(x/y) membranes and Nafion 117 are investigated and compared. The VRBs assembled with the CSOPBI membranes exhibit significantly higher columbic efficiency and lower self-discharge rate than that assembled with Nafion 117 owing to the extremely lower vanadium cations crossover of the former. The VRB assembled with the CSOPBI-NH2(9/1) membrane exhibits fairly high energy efficiency (~85% at 60 mA cm−2) and little decay in performance is observed after 300 charge-discharge cycles.

Keywords Sulfonated polybenzimidazole; Membrane; Cross-linking; Vanadium permeability; Redox flow battery performance

wiki/pub/j.memsci.2016.10.050.1491542844.txt.gz · 最后更改: 2017/04/07 13:27 由 张伟明