Composite, solvent-casted nafion membranes for vanadium redox flow Batteries

摘要

The efficacy of metal oxide particles in mitigating vanadium ions crossover was investigated. 3 wt SiO_2 was incorporated within recast Nafion membrane from which membrane electrode assemblies were prepared by painting. The composite membranes exhibited proton conductivities slightly lower (～54-55 mS cm~(-1)) than Nafion. However, the permeability of vanadium ions was lowered by 80-85, while the performance was improved. These results demonstrated that loadings of SiO_2 much lower than previously reported can mitigate vanadium-ion crossover. Additionally the direct application of the catalyst on the membrane was shown to be a viable MEA synthesis option.