MgO-MgF2 system obtained by sol–gel method as an immobilizing agent of the electrolyte applied in the high temperature cells

Abstract

A MgF 2 -MgO system was tested as an immobilizing agent for the electrolyte KCl-LiCl-RbCl in high temperature cells. Samples of MgF 2 -MgO with different contents of MgF 2 (0-20 mol%) were prepared by one-step sol-gel method in the reaction of magnesium methoxide dissolved in methanol with aqueous solution of hydrofluoric acid. The immobilizing agents were characterized by X-ray powder diffraction, low-temperature nitrogen adsorption and thermogravimetric measurements. Dimensional stability, mechanical strength and unfilled spaces were characterized using pellets containing 40 wt% of immobilizing agents. Finally, the pellets were used in an electric cell at 400°C and the changes in current and voltage were recorded in time. The introduction of MgF 2 to MgO in the synthesis by the sol-gel method significantly improves the textural and mechanical properties of immobilizing agent and ensures longer and more stable work of high temperature cell. Graphical abstractKeywords Sol-gel method

Aminotetrazole-Functionalized SiO2 Coated MgO Nanoparticle Composites for Removal of Acid Fuchsin Dye and Detection of Heavy Metal Ions

“…The thermal stability and the degree of functionalization of the as-prepared materials were investigated using thermogravimetric analyses, which are depicted in Figure b. The TGA curve of MgO shows two-step dehydration in the range of 30–350 °C, corresponding to the desorption of the surface-bound water (7.37%) and the dehydroxylation process (23.66%) . In the case of MS , only one weight loss step (30–180 °C, 7.51%), related to dehydration of physically adsorbed water molecules, can be seen.…”

“…The TGA curve of MgO shows two-step dehydration in the range of 30− 350 °C, corresponding to the desorption of the surface-bound water (7.37%) and the dehydroxylation process (23.66%). 46 In the case of MS, only one weight loss step (30−180 °C, 7.51%), related to dehydration of physically adsorbed water molecules, can be seen. For MSN and MSNT, besides dehydration weight losses (30−115 °C; 1.55% (MSN), 1.25% (MSNT)), the S1.…”