Composite membrane made of zeolite HA and Nafion 117 is formed by solution casting method. The external surface of zeolite HA has been functionalized in order to improve the interface bonding between Nafion ionomer and zeolite crystals. By incorporating functionalized zeolite HA, methanol permeability of composite membrane is reduced as much as 69%. The effect of temperature on methanol permeability is discussed.

membrane, Nafion, zeolite A, DMFC, methanol permeability