Příprava a studium systémů na bázi La-Ni pro vodíkové technologie

Abstract

This thesis focuses on the preparation and study of lanthanum-nickel-based materials for hydrogen technology applications. It primarily investigates the material properties of metal hydrides, which are potential candidates for safe and efficient hydrogen storage. In the experimental section, samples were prepared using induction melting and an arc furnace. Phase composition was analyzed by X-ray diffraction (XRD), and the structure of the samples was further examined using scanning electron microscopy (SEM). Thermal properties, including heat capacity and enthalpy changes during absorption and desorption processes, were determined using differential scanning calorimetry (DSC) and the Sieverts method. The measured PCT curves enabled the determination of equilibrium absorption and desorption pressures, from which the thermodynamic parameters sorbtion/desorption and kinetics of the hydrides were calculated. The results indicate that LaNi5-based materials exhibit good hydriding properties with favorable enthalpy and entropy values, confirming their potential for hydrogen storage applications. This study contributes to a deeper understanding of metal hydride properties of sorbtion/desorption, and their use in modern low-carbon energy systems.