PVDF/分子筛离子交换膜制备与盐差发电性能研究

Preparation of PVDF/molecular sieve ion exchange membraneand research on reverse electrodialysis performance

反电渗析盐差发电是一种新型有潜力的发电方法,其中离子交换膜是盐差发电核心部件,其电化学和物理化学特性决定盐差发电性能。采用相转换法制备了PVDF/分子筛基膜,然后接枝苯乙烯并磺化,得到PVDF/分子筛复合离子交换膜.实验结果表明,PVDF/分子筛复合离子交换膜中分子筛的最佳添加量为1%(质量分数),此膜的含水率为45.8%、电阻为11.4Ω/cm^(2),离子传导率为2.17×10^(-3)S/cm^(2),离子交换容量为2.5 mmol/g,对比商业阳离子交换膜,盐差发电功率从0.87 W/m^(2)提升到1.05 W/m^(2),提高了20%.

Reverse electrodialysis is a new power generation method with potential for research and development.Ion exchange membrane is the core component of reverse electrodialysis power generation,and its electrochemical and physicochemical properties determine the power generation performance.PVDF/molecular sieve composite membrane was prepared by phase conversion method,and then styrene was grafted and sulfonated to obtain PVDF/molecular sieve composite ion exchange membrane.The experimental results show that the optimum addition of molecular sieve in PVDF/molecular sieve composite ion exchange membrane is 1%,the water content of the membrane is 45.8%,the resistance is 11.4Ω/cm^(2)and the ion conductivity is 2.17×10^(-3)S/cm^(2),the ion exchange capacity is 2.5 mmol/g.Compared with commercial cation exchange membrane,the salt difference power generation is increased from 0.87 W/m^(2)to 1.05 W/m^(2),with an increase of 20%.