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The intermetallic phase LaNi5 is known as a material for reversible hydrogen storage due to its suitable thermodynamic properties, and relatively fast kinetics of hydrogen absorption and desorption with the formation of LaNi5H6 hydride. This work focuses on the synthesis and characterization of a modified LaNi5 phase with the addition of indium. The aim is to influence the microstructure and hydrogen storage properties of this material.The samples were prepared by melting in an arc melting furnace under an inert atmosphere of pure argon and then annealed for a long time to establish a thermodynamic equilibrium state. Chemical composition and structural characterization were performed using X-ray diffraction (XRD) and electron microscopy (SEM) to identify present phases. Attention was paid to the effect of indium addition on the stability of the intermetallic structure and the stability of any secondary phases and subsequently produced hydrides. The thermodynamic hydrogenation properties of the prepared alloys were studied by measuring pressure-concentration isotherms (p-c-T curves) during hydrogen absorption and desorption cycles. The experiments made it possible to determine the maximum hydrogen storage capacity and enthalpy and entropy of the process. The results suggest that modifying the LaNi5 alloy with indium can affect the thermodynamics and kinetics of hydrogen storage proces, as well as the maximum hydrogen storage capacity.
Keywords: LaNi5, hydrogen storage, stability, thermodynamics, SEM, XRD, p-c-T curves© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.