Sulfonated-Graphene/Nafion Composite Membrane for All Vanadium Redox Flow Batteries
- 2015年第21卷 
本文通过磺化石墨烯对Nafion膜进行改性，研究了磺化石墨烯/Nafion复合膜（GRS-Nafion复合膜）的吸水率、电阻率和钒离子迁移数. 结果表明，经磺化石墨烯改性之后，GRS-Nafion复合膜的面电阻和钒离子渗透率显著降低. 全钒液流电池的测试结果表明，GRS-Nafion复合膜有着更加优异的电化学性能，展示出GRS-Nafion复合膜在液流电池中的应用潜力.Nafion membrane has been widely used in fuel cells due to its good proton conductivity, chemical and mechanical stabilities. However, the well-developed water channels in Nafion membrane have restricted its application in all vanadium redox flow batteries owing to the high permeation of vanadium ions and the cost. In this work, the water adsorption rate, resistivity and transference number of vanadium ions of sulfonated-graphene/Nafion composite membrane were investigated and compared with those of Nafion membrane in an effort to overcome the abovementioned drawbacks. It was found that the area resistivity and permeation rate of sulfonated-graphene/Nafion composite membrane were significantly reduced after the modification of Nation membrane by sulfonated grapheme. The results from the all vanadium redox flow battery indicated that the sulfonated-graphene/Nafion composite membrane exhibited better electrochemical performance, demonstrating potential application in all vanadium redox flow batteries.