Preparation and Conductivity of Organic-Tungstovanadophosphoric Acid Hybrid Materials

Highly conducting hybrid materials were prepared from 90 wt% tungstovanadophosphoric heteropoly acids with Dawson structure (H7P2W17VO62 or H9P2W15V3O62, abbreviated as P2W17V or P2W15V3) and 10 wt% organic polymers (polyvinylpyrrolidone, PVP or polyethylene glycol, PEG). The result reveals that the conductivities of PVP/P2W17V, PEG/P2W17V, PVP/P2W15V3, and PEG/P2W15V3 are 4.70 × 10−3, 1.02 × 10−2, 7.03 × 10−3, and 2.00 × 10−2 S·cm−1 at 26°C and 75% relative humidity, respectively. Their activation energies of proton conduction are 10.72, 9.51, 14.87 and 13.79 kJ·mol−1, which are lower than that of the pure heteropoly acids. The mechanism of proton conduction of hybrid materials are Grotthuss mechanisms.