Novel Fluorinated Acids for Phosphoric Acid Fuel Cells. Final Report, April 1989-December 1991.

摘要

The efficiency of commercial fuel cells utilizing 85 percent phosphoric acid as a working electrolyte could be enhanced if improved electrolytes can be developed. Previous work on molecular acids containing the CF3SO2N(H)SO2CF2- and CF3SO2CH2SO2CF2- functions have shown that these compounds give enhanced performance when used as low concentration additives in fuel cells utilizing phosphoric acid electrolyte. Incorporating the improvements in a practical fuel cell necessitates that the electrolyte be in a polymeric form. Methods were developed for the synthesis of fluorinated monomers containing the novel acid functions -CF2SO2N(H)SO2CF3 and -CF2CH(SO2CF3)2. Two ether monomers, CF2=CFCF2OCF2CF2SO2N(Na)SO2CF3 and CF2=CFOCF2CF(CF3)OCF2CF2SO2N(Na)SO2CF3 were successfully polymerized to give ionomers. Another very novel difunctional monomer capable of satisfactory copolymerication was also developed, namely CF2=CFOCF2CF(CF3)OCF2CF2SO2N(Na)SO2(CF2)4SO2N(Na)SO2CF3.