Abstract
The La 0.5Ni 1.5Mg 17 alloy prepared by hydriding combustion synthesis (HCS) was investigated by an isovolumetric method and X-ray diffraction and this alloy has a large hydrogen storage capacity with good hydriding/dehydriding (H/D) kinetics. The kinetics of hydrogen absorption/desorption (A/D) in the two-phase ( α – β ) region has been studied between 523 and 573 K under approximately isobaric conditions and the experimental data were analyzed to find the kinetics mechanisms for both the H/D processes. It is shown that the rate-controlling step of the H/D processes is the diffusion of hydrogen, due to the good agreement between the experimental results and calculated curves using a simple new kinetic model. The activation energies are calculated to be 86.8 kJ/mol H 2 for absorption and 84.9 kJ/mol H 2 for desorption, which were much smaller than that of MgH 2, and can be attributed to the La and Ni additions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
