article · Materials
This research evaluates the hydrogen absorption and desorption behaviour of a LaNi4.4Fe0.3Al0.3 metal alloy bed. Experimental measurements of pressure, concentration, and temperature isotherms were analysed using a numerical model to describe how hydrogen interacts with the material. By fitting the model equations to the experimental data, key parameters were derived, including the number of hydrogen atoms accommodated per site, the density of receptor sites, and energetic indicators. The study tracked how these parameters vary with temperature during the uptake and release of hydrogen. In addition, fundamental thermodynamic properties were evaluated, showing that internal energy varies between 138 and 181 kJ/mol during absorption and between 140 and 179 kJ/mol during desorption. Changes in entropy and Gibbs free energy across various pressures were also mapped.
Understanding the thermodynamics of metal hydride materials is essential for developing safe and effective hydrogen storage systems. By detailing how the LaNi4.4Fe0.3Al0.3 alloy absorbs and releases hydrogen under varying conditions, this research provides the fundamental data needed to design and predict the performance of solid-state hydrogen storage beds.
This work represents early-stage, fundamental research focused on characterising material behaviour and validating a mathematical model. While the findings provide useful baseline data for developers and engineers working on solid-state hydrogen storage materials and systems, the abstract does not indicate a direct application pathway or report testing in a functional commercial device.
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In this article, the experimental measurements of the absorption/desorption P–C–T isotherms of hydrogen in the LaNi4.4Fe0.3Al0.3 alloy at different temperatures and constant hydrogen pressure have been studied using a numerical model. The mathematics equations of this model contain parameters, such as the two terms, nα and nβ, representing the numbers of hydrogen atoms per site; Nmα and Nmβ are the receptor sites’ densities, and the energetic parameters are Pα and Pβ. All these parameters are derived by numerically adjusting the experimental data. The profiles of these parameters during the absorption/desorption process are studied as a function of temperature. Thereafter, we examined the evolution of the internal energy versus temperature, which typically ranges between 138 and 181 kJmol−1 for the absorption process and between 140 and 179 kJmol−1 for the desorption process. The evolution of thermodynamic functions with pressure, for example, entropy, Gibbs free energy (G), and internal energy, are determined from the experimental data of the hydrogen absorption and desorption isotherms of the LaNi4.4Al0.3Fe0.3 alloy.
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DOI: 10.3390/ma16155425
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