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Proton‐conductive membranes based on vanadium substituted heteropoly acids with K eggin structure and polymers
Author(s) -
Tian Naiqin,
Wu Xuefei,
Yang Baihe,
Wu Qingyin,
Cao Fahe,
Yan Wenfu,
Yaroslavtsev Andrei B.
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42204
Subject(s) - vanadium , membrane , keggin structure , materials science , dielectric spectroscopy , conductive polymer , polymer , proton transport , polymer chemistry , proton , conductivity , infrared spectroscopy , proton conductor , electrochemistry , arrhenius equation , chemical engineering , electrolyte , analytical chemistry (journal) , chemistry , activation energy , composite material , electrode , organic chemistry , catalysis , biochemistry , physics , quantum mechanics , engineering , metallurgy
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 ·8H 2 O and H 5 SiW 11 VO 40 ·15H 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 −2 and 10 −4 S cm −1 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 −1 for SPEEK/PW 11 V and 14.40 kJ mol −1 for PVA/SiW 11 V, which indicates that the proton conduction complies with the Grotthuss mechanism. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42204.