The effect of the partial replacement of lanthanum in LaNi5H with cerium, praseodymium, and neodymium on absorption and desorption kinetics

Study of the hydrogenation mechanism of LaCuMg8 ternary phase: The decomposition induces kinetics improvement

“…At the beginning of the absorption reaction a surface process, a chemisorption process and a nucleation process appear, in order to form the hydride (b phase) [28]. When the hydride is formed completely, the diffusion of hydrogen through the hydride layer constitutes the determining step [29,30]. The reaction mechanism was analysed by AvramieErofeev equation in the domain 0.2 F 0.8 following eq.…”

Kinetics of hydrogen absorption in Ho1−xMmxCo2 alloys

“…Almost in all the kinetic plots, each one consist different linear segments, which extends in the certain range rather than linear over the entire reaction range. Each line segment represents a different stage in which the reaction is controlled by a different process [5,25,26]. These plots involve a phase transformation and demonstrate the existence of three phases namely ␣-, (␣ + ␤)-and ␤-phases, which are observed by the existence of different slopes of the straight line segments and are changes at the phase boundary for each kinetic plot.…”

Research on compressor utilizing hydrogen storage materials for application in heat treatment facilities

“…These alloys, similar to LaNi5 are characterized by very fast kinetics of absorption and desorption [12][13][14][15], a moderate value of reaction enthalpy (32.8 kJ/mol for LaNi4.8Sn0.2 [16] and 44.1 kJ/mol for LaNi4.25Al0.75 [17]) and temperatures of ab-and desorption convenient from the technological point of view. Fig.…”