A filled ionomeric membrane was achieved by dispersing phosphatoantimonic acid H_3Sb_3P_2O_14 xH_2O (H3) in a sulfonated Polysulfone solution [1]. Water up-take is higher for filled than unfiled membrane as well as protonic conductivity which is larger than that expected from the overall calculated concentration in charge cariers: a conductivity value of 0.135 s.cm~(-1) was gainedat 50 deg C under 100
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