Crystal structure, hydrogen absorption and thermodynamics of Zr1−xCoxFe2 alloys

In this paper, the structural and hydrogen storage properties of Zr1−xCoxFe2 (x = 0.2, 0.3, 0.4, 0.5) hydrogen storage alloys have been systematically investigated. XRD analysis of the alloys have revealed that all the alloys were formed as a single phase alloys having C14 laves phase hexagonal structure. With increasing Co addition, the unit cell volume decreases. P-C-T curves were measured in the pressure and temperature range of 0.5 ≤ P ≤ 60 bar and 303 ≤ T ≤ 373 K using a Sievert type apparatus. The results indicate that with increasing Co content in the samples, the plateau pressure increases whereas hydrogen storage capacity and stability decreases.