CELLS

摘要

There is described a fuel cell or electrolytic cell comprising an ion-conductive polymeric material which includes a first repeat unit of formula (I): - (O-Ph<1>-CO-Ph<1>-O-Ph<1>-CO-Ph<1>) -, and a second repeat unit of formula (II): - (O-Ph<2>-O-Ph<3>-CO-Ph<4>) -, or of formula (III): (O-Ph<2>-O-Ph<3>-SO2-Ph<4>) -; wherein Ph<1>, Ph<2>, Ph<3> and Ph<4> independently represent phenyl moieties and wherein said second repeat unit is provided with ion-exchange sites. The polymeric material may include a third repeat unit which is amorphous.