Effect of mechanical grinding on the electrochemical hydrogen storage properties of Mg–Ni–Y alloy

摘要: The nanocrystalline and amorphous Mg2Ni-type electrode alloys with a composition of Mg20 − xYxNi10 (x = 1 4) were fabricated by mechanical milling, the effects milling time on structures electrochemical hydrogen storage performances investigated in detail. Test results X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning (SEM) reveal that structure can be obtained through amorphization degree alloy visibly increases prolonging. When Y content is x 1, substitution for Mg formation secondary YMgNi4 + YMg3 phases without altering major phase Mg2Ni, but when 4, changes into phases. capacity retaining rate 20th cycle reduced from 48.3 to 37.7 % 89.8 74.7 4 increasing 0 (as-cast defined as h) 70 h. milled 30 h obtains maximum discharge 418.5 mA g−1, 10 h, it 341.5 g−1. effect kinetics related content. high ability (HRD), diffusion coefficient atom (D), charge transfer all increase However, alloy, getting steadily worse ball increasing.