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论文类型：期刊论文
发表时间：2020-02-15
发表刊物：JOURNAL OF MEMBRANE SCIENCE
收录刊物：EI、SCIE
卷号：596
ISSN号：0376-7388
关键字：Sulfonated long side chain; Polybenzimidazole; Vanadium redox flow battery; 1; 3-Propanesultone
摘要：A long-side-chain sulfonated polybenzimidazole (PBI-PS) membrane was successfully prepared by the reaction of PBI with 1, 3-propanesultone for improving the efficiencies of vanadium redox flow battery. The interaction between sulfonic acid and imidazole groups provides the PBI-PS membrane with excellent swelling resistance, leading to a swelling ratio of only 13% for the membrane with IEC of as high as 3.18 mmol g(-1). This results in an ultra-low vanadium permeability (6.5 x 10(-9) cm(2) s(-1)). The introduction of sulfonic acid-terminated flexible side chain in the membrane also constructs good microphase separation structure, leading to a low area resistance of 0.51 Omega cm(2), which is close to Nafion 212 (0.41 Omega cm(2)). This membrane exhibits excellent cell performance. The voltage and energy efficiencies are up to 90.73% and 89.13% at 80 mA cm(-2), respectively. Furthermore, the efficiencies remain constant values for 200 cycles, and no changes in chemical structure and cell efficiencies are observed after 720 h immersion in electrolyte solution.