In this article, novel proton-conducting composite membranes SPEEK/PW 11 V and PVA/SiW 11 V were synthesized from vanadium substituted heteropoly acids (H 4 PW 11 VO 40 Á8H 2 O and H 5 SiW 11 VO 40 Á15H 2 O, abbreviated as PW 11 V and SiW 11 V) and polymers (SPEEK or PVA) at the weight ratio 70 : 30. The membranes were characterized by the infrared spectroscopy, X-ray powder diffraction, and scanning electron microscopy, which confirmed the maintenance of the Keggin framework and dispersion homogeneously in the polymer matrix without long-range ordering. Their proton-conducting properties were investigated with electrochemical impedance spectroscopy. The results show that the respective proton conductivities of SPEEK/PW 11 V and PVA/SiW 11 V membranes were in the order of 10 22 and 10 24 S cm 21 at ambient temperature. The temperature dependence of the two composite membrane electrolytes exhibit Arrhenius behavior, and the observed activation energies to be 15.82 kJ mol 21 for SPEEK/PW 11 V and 14.40 kJ mol 21 for PVA/SiW 11 V, which indicates that the proton conduction complies with the Grotthuss mechanism. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42204.

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