Water sorption and protonic conductivity in a filled unfilled thermostableionomer for proton exchange membrane fuel cell

A filled ionomeric membrane is achieved by dispersing several % in weight o f the phosphatoantimonic acid H3Sb3P2O14, xH(2)O (H3), in a Sulfonated Poly Sulfone (SPS) solution (1)). Water up-take of pristine and filled SPS of di fferent cation exchange capacity (cec) was measured at 25 degrees C and 80 degrees C : it is higher for filled than unfilled membrane. Comparatively, protonic conductivity measurements performed on the same samples show a hig her conductivity for the filled samples than for the unfilled. The conducti vity value is higher than that expected from the overall calculated concent ration in charge carriers: a conductivity value of 0.06 S.cm(-1) is gained at 80 degrees C under 100% Relative Humidity (IIR) for a 1.4 meq.g(-1) cec SPS filled with 8% in H3.