Propyl-1,2,3-triazole was synthesized within the nanostructure of Nafion giving a Nafion - propyl-1,2,3-triazole composite, which was confirmed by IR and NMR. TEM images of the material revealed that the cluster structure of the composite membrane is smaller than that of Nafion. Analysis of the mechanical properties of the composite membrane showed that propyl-1,2,3-triazole might contribute to improve the strength of the network. A maximum conductivity of 0.07 S/cm and current density of 760 mA/cm(2) at 0.6 V were obtained under cell conditions of 70 degrees C, RH = 100%. (C) 2014 The Electrochemical Society. All rights reserved.