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The efficacy of metal oxide particles in mitigating vanadium ions crossover was investigated. 3 wt % SiO2 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 SiO2 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.