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wiki:pub:j.memsci.2016.10.050 [2017/04/07 13:42]
张伟明
wiki:pub:j.memsci.2016.10.050 [2017/04/07 13:43] (当前版本)
张伟明
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 //J. Membr. Sci.// **2017**, 525, Pages 229--239 (1 March 2017)\\ //J. Membr. Sci.// **2017**, 525, Pages 229--239 (1 March 2017)\\
 By Zijun Xia, Libin Ying, Jianhua Fang*, Yu-Yu Du, Wei-Ming Zhang*, Xiaoxia Guo, Jie Yin\\ By Zijun Xia, Libin Ying, Jianhua Fang*, Yu-Yu Du, Wei-Ming Zhang*, Xiaoxia Guo, Jie Yin\\
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 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. 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.
wiki/pub/j.memsci.2016.10.050.1491543768.txt.gz · 最后更改: 2017/04/07 13:42 由 张伟明