Hydrogen storage properties of a Mg–Ni–Fe mixture prepared via planetary ball milling in a H2 atmosphere
✍ Scribed by Myoung Youp Song; Sung Hwan Baek; Jean-Louis Bobet; Seong-Hyeon Hong
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 767 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0360-3199
No coin nor oath required. For personal study only.
✦ Synopsis
Addition of Ni and Fe
Reactive mechanical grinding Mg 2 Ni formation Mg(OH) 2 formation a b s t r a c t A sample composition has been designed based on previously reported data. An 80 wt% Mge13.33 wt%Nie6.67 wt%Fe (referred to as Mge13.33Nie6.67Fe) sample exhibited higher hydriding and dehydriding rates after activation and a larger hydrogen storage capacity compared to those of other mixtures prepared under similar conditions. After activation (at n ¼ 3), the sample absorbed 4.60 wt%H for 5 min and 5.61 wt%H for 60 min at 593 K under 12 bar H 2 . The sample desorbed 1.57 wt%H for 5 min and 3.92 wt%H for 30 min at 593 K under 1.0 bar H 2 . Rietveld analysis of the XRD pattern using FullProf program showed that the as-milled Mge13.33Nie6.67Fe sample contained Mg(OH) 2 and MgH 2 in addition to Mg, Ni, and Fe. The Mg(OH) 2 phase is believed to be formed through the reaction of Mg or MgH 2 with water vapor in the air. The dehydrided Mge13.33Nie6.67Fe sample after hydridingdehydriding cycling contained Mg, Mg 2 Ni, MgO, and Fe.