ABSTRACT
This chapter introduces the applications of graphene membranes as oxidation/corrosion barriers, gas/liquid filters, and biological trans-electrodes. Graphene-based protective barriers, with ultrathin thickness, have great potential for reducing the oxidation rate without excessively scarifying the intrinsic properties of the underlying materials. Limited by the state-of-the-art graphene growth technology, this is usually replaced by a few layers of graphene by scarifying the thickness of the barrier layer. Graphene is at the interface between the electrolyte and metal, and it forms a stable layer to decrease the metal dissolution. The formation of the electrochemical cell with graphene expedites the oxidation/corrosion of the underlying metal. Electrochemical corrosion is very serious when metals soak in an electrolyte. The essential protection method is to decrease the electrode reaction rate, which is related to the reaction temperature, electrolyte, and electrode potential. Highly impermeable graphene not only prevents ion movement in the liquid electrolyte, but also enables us to encase bacteria or sequence DNA.
