Abstract
Tungstovanadophosphoric heteropoly acid H6PW9V3O40·(13.81 ± 0.13)H2O (abbreviated as PW9V3) has been synthesized by the stepwise acidification and the stepwise addition of element solutions. The crystal structure was determined from single crystal X-ray diffraction. The complex crystallizes in the space group R3m, with a = 16.4374 (9) A, b = 16.4374 (9) A, c = 25.3866 (14) A, α = 90°, β = 90°, γ = 120°, V = 5940.20 A, and Z = 6. The product possesses Keggin structure, and its conductivity was 1.730 × 10–2 S·cm–1 at 26 °C and 75% relative humidity by electrochemical impedance spectroscopy (EIS) measurement. Two conducting systems were prepared with a mixture of as-synthesized PW9V3 and organic polymers [polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG)] at the weight ratio 80:20. The hybrid materials exhibit high proton conductivities with 7.110 × 10–3 and 1.050 × 10–2 S·cm–1 (PW9V3/PEG) at 26 °C and 75% relative humidity, respectively. Their activation energies of proton conduction are 15.23 and 13...
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