| 초록 |
PEFCs are environmentally friendly energy conversion systems to directly generate electricity from hydrogen via an electrocatalytic reaction. The state of the art membrane materials for PEFCs are perfluorinated sulfonic acid ionomers including Nafion® and 3M ionomers. PFSAs show high proton conductivity in the hydrated states and mild chemical resistance. In spite of these advantages, it is difficult to apply PFSA free-standing membranes in real PEFC applications owing to their relatively high production cost, weak mechanical failures during PFEC operations, and limited chemical/electrochemical stabilities. A promising approach to solve these problems is to make reinforced membranes composed of PFSA ionomers and porous poly(tetrafluoroethylene) support films. In this study, Nafion nanodispersions in water-alcohol mixtures are fabricated using a supercritical fluid technique and used as polymer electrolyte sources to fill in PTFE pores. The fundamental membrane characteristics are compared with those of a counterpart membrane made up of a commercial Nafion ionomer solution. |
