Abstract
A new model has been successfully used to investigate the hydrogen absorption kinetics mechanism of La 2Mg 17-based composites. The results indicate that different preparation conditions lead to different rate-controlling steps during hydrogen absorption process. For La 2Mg 17–LaNi 5 composite synthesized by the method of melting, the rate-controlling step is the surface penetration of hydrogen atoms, which does not change by addition agent (LaNi 5). However, mechanical milling can change the rate-limiting steps of hydriding reaction in the La 2Mg 17–LaNi 5 composite from surface penetration to diffusion of hydrogen in the hydride layer. With the enhancement of milling intensity, the rate-controlling step in La 1.8Ca 0.2Mg 14Ni 3 alloy changes from surface penetration to diffusion. In addition, the activation energies of hydrogen absorption for La 2Mg 17−20 wt%LaNi 5 and La 1.8Ca 0.2Mg 14Ni 3 are obtained by this model.
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