Proton conducting composites of heteropolyacid hydrates dispersed with salt hydrates
Source: Journal of Materials Science, Volume 37, Number 2, 15 January 2002 , pp. 249-256(8)
Abstract:Proton conduction in the composites of heteropolyacid hydrates (Phosphotungstic acid : PTA·nH_2O and Phosphomolybdic acid : PMA·nH_2O) with salt hydrates like Aluminium sulphate and Ammonium paratungstate (APT) as dispersoids has been studied and compared with the composites PTA : Al_2O_3 and PMA : Al_2O_3. Thermal analysis, XRD and IR studies on acid and salt hydrates dispersed phase systems reveal the formation of composites. A significant increase in the ionic conductivity has been observed in the composites. It has been found that the conductivity of 0.5PTA + 0.5Al_2(SO_4)_3·16H_2O is ∼1.1 × 10^−2 S·cm^−1 and that of 0.55PMA + 0.45APT is ∼1.3 × 10^−3 S·cm^−1 at 65% R.H. The temperature and humidity dependence of bulk electrical conductivity of the composites is also reported.
Document Type: Regular Paper
Publication date: January 15, 2002