Enhancement of the Hydriding and Dehydriding Rates of Mg by Adding TiCl3 and Reactive Mechanical Grinding

• Published in: Korean Journal of Metals and Materials Vol. 53; no. 3; pp. 187 - 191
• Main Authors: Song, Myoung Youp, Lee, Seong Ho, Kwak, Young Jun, Park, Hye ryoung
• Format: Journal Article
• Language: English
• Published: 대한금속·재료학회 01.03.2015
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.3.187

A sample with a composition of 95 wt% Mg-5 wt% TiCl3 (named Mg-5TiCl3) was prepared byreactive mechanical grinding, and its hydriding and dehydriding properties were examined. The activationof Mg-5TiCl3 was not required. Mg-5TiCl3 had an effective hydrogen-storage capacity of about 6.2 wt%. Atthe first cycle (n=1), the sample absorbed 5.77 wt% H for 5 min, 6.07 wt% H for 10 min, 6.17 wt% H for 30 min, and 6.19 wt% H for 60 min at 573 K under 12 bar H2. At n=1, the sample desorbed 0.03 wt% H for 2.5 min, 0.13 wt% H for 30 min, and 0.35 wt% H for 60 min at 573 K under 1.0 bar H2. Mg-5TiCl3 after reactive mechanical grinding contained Mg, β-MgH2, γ-MgH2, and TiH1.924. The XRD pattern of Mg-5TiCl3 dehydrided at the 4th hydriding-dehydriding cycle at 423-573 K contained β-MgH2, Mg, MgO, and TiH1.924. Mg-5TiCl3 hada higher initial hydriding rate and a larger quantity of hydrogen absorbed for 60 min than Mg-5TaF5, Mg-10Fe2O3, Mg-10MnO, and Mg, the hydrogen-storage properties of which were previously reported. KCI Citation Count: 27