膜科学与技术

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Preparation of Sulfonated Polysulfone /POSS Hybrid Proton Exchange Conductive Membranes
for Vanadium Redox Flow Battery

Authors： ZHENG Jianli, WANG Lihua, HAN Xutong

Units： 1.School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China; 2.Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

KeyWords： Sulfonated polysulfone; POSS; Proton exchange conductive membrane; Vanadium redox flow battery

ClassificationCode：TQ050.4+25

year,volume(issue):pagination： 2021,41(3):59-67

Abstract：

A series of SPSF/POSS-NH2 hybrid proton exchange conductive membranes were prepared by blending sulfonated polysulfone (SPSF) with the degree of sulfonation (DS) of 62% and aminopropyllsobutyl polyhedral oligomeric silsesquioxane (POSS-NH2). The effect of content of the POSS-NH2 on the water uptake, area resistance, ptoton proton conductivity, vanadium permeability, mechanical strength, oxidation resistance and the performance of vanadium redox flow battery are investigated in detailed. The results showed that the addition of POSS-NH2 increases the thermal decomposition temperature and proton conductivity to a value of 10.55 mS/cm. When the content of POSS-NH2 is 5wt%, the S-P-5% hybrid membrane exhibited lower vanadium permeability of 5.47×10-9 cm2/min, and higher proton selectivity (1.930×106 S•min/cm3), better than Nafion115 membrane (1.23×105 S•min/cm3) and S-P-0% membrane(5.41×105 S•min/cm3). Compared with S-P-0% membrane, S-P-5% membrane showed the best battery efficiency. Its coulombic efficiency(CE) can be maintained at about 99.4%, which is higher than Nafion 115 membrane (92.38%) and S-P-0% membrane (91.72%). Meanwhile, The the voltage efficiency and energy efficiency have also been significantly improved. The battery efficiency is still stable after 300 cycles, and the self-discharge time is 117 h, which is 10 times than that of Nafion 115 membrane. The introduction of POSS provides a new idea for the improvement of SPSF proton exchange conductive membrane performance.

Funds：

国家自然科学基金（21878317）;北京市自然科学基金-海淀原始创新联合基金（L172047）

AuthorIntro：

郑建丽（1995-）,女，山西省长治市，硕士，主要从事质子交换膜研究

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