Abstract
Anodic alumina membranes have been impregnated with a protonic conductor either by immersion or by vacuum permeation of a saturated aqueous solution of CsHSO 4 for different times. Synthetized salt, obtained through the reaction of cesium carbonate with sulphuric acid (in excess), contained a small quantity of Cs 2SO 4. Unmodified membranes consist of amorphous Al 2O 3 with a regular distribution of pores (average diameter: 200 nm) and are stable up to 850 °C. Long impregnation times caused partial dissolution of alumina, with formation of Al(HSO 4) 3 on the front surfaces as well as into pore walls. From the frequency dispersion of the impedance, the “macroscopic conductivity” of membranes after different treatments was derived as a function of temperature, and compared with those relative to both unmodified membranes and the pure protonic conductor. The latter shows a sudden increase in conductivity at T > 140 °C, where a superprotonic transition occurs according to DTA analysis.
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