Abstract
La2MgNi7.5Co1.5 hydrogen storage alloy was prepared by magnetic field assisted sintering method. The phase structure and hydrogen absorption properties of the alloy were systematically studied by means of isothermal constant volume method, XRD, SEM, EDS and HPDSC etc. The results showed that the main phase is PuNi3 type structure of (La, Mg) (Ni, Co)3. The impure phase La (Ni, Co)5 decreased firstly and increased later with the magnetic field increased. Addition of Co can improve the hydrogen absorption and desorption properties of the alloy obviously, the maximum hydrogen storage capacity reached 1.538 wt.%. The dehydrogenation DSC curve of the alloy has a multimodal characteristics. The magnetic field changed hydrogen desorption thermal behavior of (La, Mg)(Ni, Co)3 phase significantly. The alloy after activation showed excellent hydrogen absorption and desorption kinetics performance.
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