The Study Of Hydrogen Absorption By And Titanium Enhanced Hydrogen Absorption Effect Of Titanium-Lithium Alloy

Titanium is one traditional hydrogen storage material, and Titanium and titanium based alloy have the advantage of high hydrogen storage capacity, low desertion temperature and low-price . Titanium-based alloy are often used for industry hydrogen storage, while titanium is often used for tritium storage. Based on the reviews of literatures, firstly, we summarized the development, classification of hydrogen-storage alloy, their hydrogen-storage principle and application; secondly, we synthesized Ti-Li alloy using Lithium diffusion with Titanium as study object, optimized its hydrogen-storage capacity, measured the desorption P-t cures of Titanium and Ti-Li alloy, respectively, and compared their hydrogen-storage capacity; finally, we analyzed phase structure, apparent morphology, and relative content of the sample using x-ray diffraction (XRD), scanning electron microscope (SEM)and secondary ion mass spectroscopy (SIMS).Through the study on the change of desertion amount of Titanium and Ti-Li alloy with time, we could conclude that: under the same hydrogen pressure within certain range, the higher the Hydrogen-absorption temperature, the more the Hydrogen-absorption amount, meanwhile, the bigger the Hydrogen-desorption velocity; under the same Hydrogen-absorption temperature, the bigger the Hydrogen pressure, the more the corresponding hydrogen-absorption amount; under the same hydrogen pressure and hydrogen-absorption temperature, the hydrogen-desorption amount of Ti-Li alloy is more than that of Titanium, namely, the hydrogen-absorption capacity of the former is better.We obtained the phage change of Titanium before and after hydrogen-absorption/desorption by analyzing phase structure of the sample using XRD: the structure of Titanium before hydrogen-absorption is close-packed hexagonal, the TiH₂ that formed via hydrogen-absorption is body -centered tetragonal, and the TiH that formed due to hydrogen-desertion of TiH₂ is cubic.Through analysis on apparent morphology of the sample using SEM, we found that many bores, holes and cracks were produced after many times of hydrogen-absorption/desorption circles, and these bores and holes were tunnels for hydrogen passing in and out and were produced due to hydrogen-absorption/desorption circles and subsequent continuous expansion and constriction of crystal lattices.Through analysis on relative content of the sample with SIMS, we found that thedepth of hydrogen-diffusion was over1.2μm, this depth was enough to be used astritium-target. The study of hydrogen-absorption amount also demonstrated that it was feasible to use LI-Ti alloy as tritium-target.