Mg-Ni-Cu mixtures for hydrogen storage: A kinetic study

Research Area: Uncategorized Year: 2010
Type of Publication: Article
Journal: INTERMETALLICS Volume: 18
Number: 2 Pages: 203-211
Month: February
ISSN: 0966-9795
Mg-based ternary mixtures (40 reasing amount (up to 30 wt %) of Ni and Cu were prepared by ball milling (BM) under At for 16 h and subsequently activated at high temperature (623 K) by charging/discharging cycles at H(2) pressure of 50 bar/0.7 bar. The work aims to analyze the influence of the mixtures' composition on the storage properties (H(2) intake and sorption kinetics) and to describe the role played by an ad-hoc activation in reaching these same properties. The storage capacity of the mixtures decreases by decreasing the Mg starting content, the H(2) active phases being “free Mg” and the “bonded Mg” intermetallic compounds Mg(2)Ni and Mg(2)Cu. After full activation (3 charging/discharging runs), “free Mg” hydrogenates 10 times quicker than the “bonded Mg phases”, while the discharging of both “free” and “bonded” Mg hydrides takes place simultaneously with similar kinetics. The best kinetic performance is shown by the samples with Mg = 60 wt% and 70 wt% and the highest Ni content (30% and 20% respectively), with sorption rates up to 7 times higher than those of the pure Mg/MgH(2) system. (C) 2009 Elsevier Ltd. All rights reserved.
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