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The purpose of this study was to improve the repulsion ability of sulfonated poly(ether ether ketone) (SPEEK) membrane for the vanadium ions crossover. For this purpose graphene oxide (GO) nanosheet and titanium dioxide (TiO₂) nanoparticles were employed into the polymer matrix to prepare SPEEK/GO/TiO₂ hybrid membrane via solution-casting method for vanadium redox flow battery (VRF. The morphology, permeability of vanadium ions and device performance of asprepared membrane were investigated and discussed. It was observed that with the