High temperature, carbon monoxide-tolerant perfluorosulfonic acid composite membranes and methods of making same

摘要

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.