Study of the hydrogen absorption properties of LaNi5 Intermetallic Alloy

摘要: In this paper, the hydrogen absorption properties of LaNi5 alloy have been investigated by Sievert's volumetric method. According to results of pressure-composition-temperature curves, with increasing of temperature, the hydrogen absorption capacity and plateau pressure decrease and increase, respectively. The enthalpy (-29.98±0.38 kJ/molH2) and entropy (-104.98±1.21 J/K molH2) of LaNi5Hx hydride formation were calculated using Van't Hoff equation. The rate constant of hydrogen absorption reaction at different temperature were obtained using Jander diffusion model (JDM) that confirmed an increase in hydrogen absorption rate with temperature. The activation energy for hydrogen absorption reaction was estimated by Arrhenius relationship about 24.11 kJ/mol. H2. The obtained results are in good agreement with others.