| abstract |
PFSAs having CO tolerances greater than 500 ppm at temperatures above 100°C are provided by decreasing the equivalent weight and thickness of the membrane and impregnating the membrane pores with an oxide, e.g., a hydrophilic siloxane polymer or TiO2. This was accomplished by either impregnating an extruded PFSA film via sol-gel processing of tetraethoxysilane, or by preparing a recast film, using solubilized PFSA and an oxide source. |