Acidic cesium salts of phosphotungstic acid: Morphology, water content and ionic conductivity

In this work, the effect of synthesis conditions (ratio and concentration of reagents) on the composition, morphology, water content and ion-conducting properties of CsxH3-xPW12O40 salts were studied. The morphology of the salts is mainly determined by the concentrations of the reagents during the synthesis. At a higher concentration of reagents, the obtained salts have a relatively narrow, monomodal particle size distribution and a large specific surface area. The composition of the salts depends both on the concentration of the reagents and on their ratio. Higher concentrations of reagents make it possible to obtain more acidic salts. Apparently, salts contain both adsorption and crystalline water. It is also assumed that the main charge carriers in these salts are protons, and their transport is carried out mainly through the network of adsorption water on the surface of the salts. The most promising for catalysis of the obtained salts has 1.2 +/- 0.3 protons in its composition, a specific surface area of 136 +/- 14 m(2)/g and an ionic conductivity of 0.05 S cm(-1) at room temperature and 75% RH.

Automated summary

This work studied the influence of synthesis conditions on the composition, morphology, water content, and ion-conducting properties of CsxH3-xPW12O40 salts. The morphology of the salts is determined by the concentrations of the reagents during synthesis, with higher concentrations resulting in narrower particle size distribution and larger specific surface area. The composition of the salts depends on both the concentration and ratio of the reagents. The salts contain both adsorption and crystalline water, and proton is assumed to be the main charge carrier for ion transport through the network of adsorption water on the salt surface. The most promising catalyst among the obtained salts exhibits a composition of 1.2+/-0.3 protons, a specific surface area of 136+/-14 m(2)/g, and an ionic conductivity of 0.05 S cm(-1) at room temperature and 75% RH.